From 70b3d0efa60b9c63df371b7d99c5f0ed926ffb97 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Felix=20Kohlgr=C3=BCber?= Date: Tue, 12 Mar 2019 13:38:46 +0100 Subject: [PATCH 0001/4780] add syntax-tree-patterns RFC --- rfcs/0001-syntax-tree-patterns.md | 797 ++++++++++++++++++++++++++++++ 1 file changed, 797 insertions(+) create mode 100644 rfcs/0001-syntax-tree-patterns.md diff --git a/rfcs/0001-syntax-tree-patterns.md b/rfcs/0001-syntax-tree-patterns.md new file mode 100644 index 000000000..8d285b2ef --- /dev/null +++ b/rfcs/0001-syntax-tree-patterns.md @@ -0,0 +1,797 @@ +- Feature Name: syntax-tree-patterns +- Start Date: 2019-03-12 +- RFC PR: (leave this empty) +- Rust Issue: (leave this empty) + +> Note: This project is part of my Master's Thesis (supervised by [@oli-obk](https://github.com/oli-obk)) + +# Summary +[summary]: #summary + +Introduce a domain-specific language (similar to regular expressions) that allows to describe lints using *syntax tree patterns*. + + +# Motivation +[motivation]: #motivation + + +Finding parts of a syntax tree (AST, HIR, ...) that have certain properties (e.g. "*an if that has a block as its condition*") is a major task when writing lints. For non-trivial lints, it often requires nested pattern matching of AST / HIR nodes. For example, testing that an expression is a boolean literal requires the following checks: + +``` +if let ast::ExprKind::Lit(lit) = &expr.node { + if let ast::LitKind::Bool(_) = &lit.node { + ... + } +} +``` + +Writing this kind of matching code quickly becomes a complex task and the resulting code is often hard to comprehend. The code below shows a simplified version of the pattern matching required by the `collapsible_if` lint: + +``` +// simplified version of the collapsible_if lint +if let ast::ExprKind::If(check, then, None) = &expr.node { + if then.stmts.len() == 1 { + if let ast::StmtKind::Expr(inner) | ast::StmtKind::Semi(inner) = &then.stmts[0].node { + if let ast::ExprKind::If(check_inner, content, None) = &inner.node { + ... + } + } + } +} +``` + +The `if_chain` macro can improve readability by flattening the nested if statements, but the resulting code is still quite hard to read: + +``` +// simplified version of the collapsible_if lint +if_chain! { + if let ast::ExprKind::If(check, then, None) = &expr.node; + if then.stmts.len() == 1; + if let ast::StmtKind::Expr(inner) | ast::StmtKind::Semi(inner) = &then.stmts[0].node; + if let ast::ExprKind::If(check_inner, content, None) = &inner.node; + then { + ... + } +} +``` + +The code above matches if expressions that contain only another if expression (where both ifs don't have an else branch). While it's easy to explain what the lint does, it's hard to see that from looking at the code samples above. + +Following the motivation above, the first goal this RFC is to **simplify writing and reading lints**. + +The second part of the motivation is clippy's dependence on unstable compiler-internal data structures. Clippy lints are currently written against the compiler's AST / HIR which means that even small changes in these data structures might break a lot of lints. The second goal of this RFC is to **make lints independant of the compiler's AST / HIR data structures**. + +# Approach + +A lot of complexity in writing lints currently seems to come from having to manually implement the matching logic (see code samples above). It's an imparative style that describes *how* to match a syntax tree node instead of specifying *what* should be matched against declaratively. In other areas, it's common to use declarative patterns to describe desired information and let the implementation do the actual matching. A well-known example of this approach are [regular expressions](https://en.wikipedia.org/wiki/Regular_expression). Instead of writing code that detects certain character sequences, one can describe a search pattern using a domain-specific language and search for matches using that pattern. The advantage of using a declarative domain-specific language is that its limited domain (e.g. matching character sequences in the case of regular expressions) allows to express entities in that domain in a very natural and expressive way. + +While regular expressions are very useful when searching for patterns in flat character sequences, they cannot easily be applied to hierarchical data structures like syntax trees. This RFC therefore proposes a pattern matching system that is inspired by regular expressions and designed for hierarchical syntax trees. + +# Guide-level explanation +[guide-level-explanation]: #guide-level-explanation + +This proposal adds a `pattern!` macro that can be used to specify a syntax tree pattern to search for. A simple pattern is shown below: + +``` +pattern!{ + my_pattern: Expr = + Lit(Bool(false)) +} +``` + +This macro call defines a pattern named `my_pattern` that can be matched against an `Expr` syntax tree node. The actual pattern (`Lit(Bool(false))` in this case) defines which syntax trees should match the pattern. This pattern matches expressions that are boolean literals with value `false`. + +The pattern can then be used to implement lints in the following way: + +``` +... + +impl EarlyLintPass for MyAwesomeLint { + fn check_expr(&mut self, cx: &EarlyContext, expr: &syntax::ast::Expr) { + + if my_pattern(expr).is_some() { + cx.span_lint( + MY_AWESOME_LINT, + expr.span, + "This is a match for a simple pattern. Well done!", + ); + } + + } +} +``` + +The `pattern!` macro call expands to a function `my_pattern` that expects a syntax tree expression as its argument and returns an `Option` that indicates whether the pattern matched. + +> Note: The result type is explained in more detail in [a later section](#the-result-type). For now, it's enough to know that the result is `Some` if the pattern matched and `None` otherwise. + +## Pattern syntax + +The following examples demonstate the pattern syntax: + + +#### Any (`_`) + +The simplest pattern is the any pattern. It matches anything and is therefore similar to regex's `*`. + +``` +pattern!{ + // matches any expression + my_pattern: Expr = + _ +} +``` + +#### Node (`()`) + +Nodes are used to match a specific variant of an AST node. A node has a name and a number of arguments that depends on the node type. For example, the `Lit` node has a single argument that describes the type of the literal. As another example, the `If` node has three arguments describing the if's condition, then block and else block. + +``` +pattern!{ + // matches any expression that is a literal + my_pattern: Expr = + Lit(_) +} + +pattern!{ + // matches any expression that is a boolean literal + my_pattern: Expr = + Lit(Bool(_)) +} + +pattern!{ + // matches if expressions that have a boolean literal in their condition + // Note: The `_?` syntax here means that the else branch is optional and can be anything. + // This is discussed in more detail in the section `Repetition`. + my_pattern: Expr = + If( Lit(Bool(_)) , _, _?) +} +``` + + +#### Literal (``) + +A pattern can also contain Rust literals. These literals match themselves. + +``` +pattern!{ + // matches the boolean literal false + my_pattern: Expr = + Lit(Bool(false)) +} + +pattern!{ + // matches the character literal 'x' + my_pattern: Expr = + Lit(Char('x')) +} +``` + +#### Alternations (`a | b`) + +``` +pattern!{ + // matches if the literal is a boolean or integer literal + my_pattern: Lit = + Bool(_) | Int(_) +} + +pattern!{ + // matches if the expression is a char literal with value 'x' or 'y' + my_pattern: Expr = + Lit( Char('x' | 'y') ) +} +``` + +#### Empty (`()`) + +The empty pattern represents an empty sequence or the `None` variant of an optional. + +``` +pattern!{ + // matches if the expression is an empty array + my_pattern: Expr = + Array( () ) +} + +pattern!{ + // matches if expressions that don't have an else clause + my_pattern: Expr = + If(_, _, ()) +} +``` + +#### Sequence (` `) + +``` +pattern!{ + // matches the array [true, false] + my_pattern: Expr = + Array( Lit(Bool(true)) Lit(Bool(false)) ) +} +``` + +#### Repetition (`*`, `+`, `?`, `{n}`, `{n,m}`, `{n,}`) + +Elements may be repeated. The syntax for specifying repetitions is identical to [regex's syntax](https://docs.rs/regex/1.1.2/regex/#repetitions). + +``` +pattern!{ + // matches arrays that contain 2 'x's as their last or second-last elements + // Examples: + // ['x', 'x'] match + // ['x', 'x', 'y'] match + // ['a', 'b', 'c', 'x', 'x', 'y'] match + // ['x', 'x', 'y', 'z'] no match + my_pattern: Expr = + Array( _* Lit(Char('x')){2} _? ) +} + +pattern!{ + // matches if expressions that **may or may not** have an else block + // Attn: `If(_, _, _)` matches only ifs that **have** an else block + // + // | if with else block | if witout else block + // If(_, _, _) | match | no match + // If(_, _, _?) | match | match + // If(_, _, ()) | no match | match + my_pattern: Expr = + If(_, _, _?) +} +``` + +#### Named submatch (`#`) + +``` +pattern!{ + // matches character literals and gives the literal the name foo + my_pattern: Expr = + Lit(Char(_)#foo) +} + +pattern!{ + // matches character literals and gives the char the name bar + my_pattern: Expr = + Lit(Char(_#bar)) +} + +pattern!{ + // matches character literals and gives the expression the name baz + my_pattern: Expr = + Lit(Char(_))#baz +} +``` + +The reason for using named submatches is described in the section [The result type](#the-result-type). + +### Summary + +The following table gives an summary of the pattern syntax: + +| Syntax | Concept | Examples | +|-------------------------|------------------|--------------------------------------------| +|`_` | Any | `_` | +|`()` | Node | `Lit(Bool(true))`, `If(_, _, _)` | +|`` | Literal | `'x'`, `false`, `101` | +|` \| ` | Alternation | `Char(_) \| Bool(_)` | +|`()` | Empty | `Array( () )` | +|` ` | Sequence | `Tuple( Lit(Bool(_)) Lit(Int(_)) Lit(_) )` | +|`*`
`+`
`?`
`{n}`
`{n,m}`
`{n,}` | Repetition





| `Array( _* )`,
`Block( Semi(_)+ )`,
`If(_, _, Block(_)?)`,
`Array( Lit(_){10} )`,
`Lit(_){5,10}`,
`Lit(Bool(_)){10,}` | +|`#` | Named submatch | `Lit(Int(_))#foo` `Lit(Int(_#bar))` | + + +## The result type +[the-result-type]: #the-result-type + +A lot of lints require checks that go beyond what the pattern syntax described above can express. For example, a lint might want to check whether a node was created as part of a macro expansion or whether there's no comment above a node. Another example would be a lint that wants to match two nodes that have the same value (as needed by lints like `almost_swapped`). Instead of allowing users to write these checks into the pattern directly (which might make patterns hard to read), the proposed solution allows users to assign names to parts of a pattern expression. When matching a pattern against a syntax tree node, the return value will contain references to all nodes that were matched by these named subpatterns. This is similar to capture groups in regular expressions. + +For example, given the following pattern + +``` +pattern!{ + // matches character literals + my_pattern: Expr = + Lit(Char(_#val_inner)#val)#val_outer +} +``` + +one could get references to the nodes that matched the subpatterns in the following way: + +``` +... +fn check_expr(expr: &syntax::ast::Expr) { + if let Some(result) = my_pattern(expr) { + result.val_inner // type: &char + result.val // type: &syntax::ast::Lit + result.val_outer // type: &syntax::ast::Expr + } +} +``` + +The types in the `result` struct depend on the pattern. For example, the following pattern + +``` +pattern!{ + // matches arrays of character literals + my_pattern_seq: Expr = + Array( Lit(_)*#foo ) +} +``` + +matches arrays that consist of any number of literal expressions. Because those expressions are named `foo`, the result struct contains a `foo` attribute which is a vector of expressions: + +``` +... +if let Some(result) = my_pattern_seq(expr) { + result.foo // type: Vec<&syntax::ast::Expr> +} +``` + +Another result type occurs when a name is only defined in one branch of an alternation: + +``` +pattern!{ + // matches if expression is a boolean or integer literal + my_pattern_alt: Expr = + Lit( Bool(_#bar) | Int(_) ) +} +``` + +In the pattern above, the `bar` name is only defined if the pattern matches a boolean literal. If it matches an integer literal, the name isn't set. To account fot this, the result struct's `bar` attribute is an option type: + +``` +... +if let Some(result) = my_pattern_alt(expr) { + result.bar // type: Option<&bool> +} +``` + +It's also possible to use a name in multiple alternation branches if they have compatible types: + +``` +pattern!{ + // matches if expression is a boolean or integer literal + my_pattern_mult: Expr = + Lit(_#baz) | Array( Lit(_#baz) ) +} +... +if let Some(result) = my_pattern_mult(expr) { + result.baz // type: &syntax::ast::Lit +} +``` + +Named submatches are a **flat** namespace and this is intended. In the example above, two different sub-structures are assigned to a flat name. I expect that for most lints, a flat namespace is sufficient and easier to work with than a hierarchical one. + +#### Two stages + +Using named subpatterns, users can write lints in two stages. First, a coarse selection of possible matches is produced by the pattern syntax. In the second stage, the named subpattern references can be used to do additional tests like asserting that a node hasn't been created as part of a macro expansion. + +## Implementing clippy lints using patterns + +As a "real-world" example, I re-implemented the `collapsible_if` lint using patterns. The code can be found [here](https://github.com/fkohlgrueber/rust-clippy-pattern/blob/039b07ecccaf96d6aa7504f5126720d2c9cceddd/clippy_lints/src/collapsible_if.rs#L88-L163). The pattern-based version passes all test cases that were written for `collapsible_if`. + + +# Reference-level explanation +[reference-level-explanation]: #reference-level-explanation + +## Overview + +The following diagram shows the dependencies between the main parts of the proposed solution: + +``` + Pattern syntax + | + | parsing / lowering + v + PatternTree + ^ + | + | + IsMatch trait + | + | + +---------------+-----------+---------+ + | | | | + v v v v + syntax::ast rustc::hir syn ... +``` + +The pattern syntax described in the previous section is parsed / lowered into the so-called *PatternTree* data structure that represents a valid syntax tree pattern. Matching a *PatternTree* against an actual syntax tree (e.g. rust ast / hir or the syn ast, ...) is done using the *IsMatch* trait. + +The *PatternTree* and the *IsMatch* trait are introduced in more detail in the following sections. + +## PatternTree + +The core data structure of this RFC is the **PatternTree**. + +It's a data structure similar to rust's AST / HIR, but with the following differences: + +- The PatternTree doesn't contain parsing information like `Span`s +- The PatternTree can represent alternatives, sequences and optionals + +The code below shows a simplified version of the current PatternTree: + +> Note: The current implementation can be found [here](https://github.com/fkohlgrueber/pattern-matching/blob/dfb3bc9fbab69cec7c91e72564a63ebaa2ede638/pattern-match/src/pattern_tree.rs#L50-L96). + + +``` +pub enum Expr { + Lit(Alt), + Array(Seq), + Block_(Alt), + If(Alt, Alt, Opt), + IfLet( + Alt, + Opt, + ), +} + +pub enum Lit { + Char(Alt), + Bool(Alt), + Int(Alt), +} + +pub enum Stmt { + Expr(Alt), + Semi(Alt), +} + +pub enum BlockType { + Block(Seq), +} +``` + +The `Alt`, `Seq` and `Opt` structs look like these: + +> Note: The current implementation can be found [here](https://github.com/fkohlgrueber/pattern-matching/blob/dfb3bc9fbab69cec7c91e72564a63ebaa2ede638/pattern-match/src/matchers.rs#L35-L60). + +``` +pub enum Alt { + Any, + Elmt(Box), + Alt(Box, Box), + Named(Box, ...) +} + +pub enum Opt { + Any, // anything, but not None + Elmt(Box), + None, + Alt(Box, Box), + Named(Box, ...) +} + +pub enum Seq { + Any, + Empty, + Elmt(Box), + Repeat(Box, RepeatRange), + Seq(Box, Box), + Alt(Box, Box), + Named(Box, ...) +} + +pub struct RepeatRange { + pub start: usize, + pub end: Option // exclusive +} +``` + +## Parsing / Lowering + +The input of a `pattern!` macro call is parsed into a `ParseTree` first and then lowered to a `PatternTree`. + +Valid patterns depend on the *PatternTree* definitions. For example, the pattern `Lit(Bool(_)*)` isn't valid because the parameter type of the `Lit` variant of the `Expr` enum is `Any` and therefore doesn't support repetition (`*`). As another example, `Array( Lit(_)* )` is a valid pattern because the parameter of `Array` is of type `Seq` which allows sequences and repetitions. + +> Note: names in the pattern syntax correspond to *PatternTree* enum **variants**. For example, the `Lit` in the pattern above refers to the `Lit` variant of the `Expr` enum (`Expr::Lit`), not the `Lit` enum. + +## The IsMatch Trait + +The pattern syntax and the *PatternTree* are independant of specific syntax tree implementations (rust ast / hir, syn, ...). When looking at the different pattern examples in the previous sections, it can be seen that the patterns don't contain any information specific to a certain syntax tree implementation. In contrast, clippy lints currently match against ast / hir syntax tree nodes and therefore directly depend on their implementation. + +The connection between the *PatternTree* and specific syntax tree implementations is the `IsMatch` trait. It defines how to match *PatternTree* nodes against specific syntax tree nodes. A simplified implementation of the `IsMatch` trait is shown below: + +``` +pub trait IsMatch { + fn is_match(&self, other: &'o O) -> bool; +} +``` + +This trait needs to be implemented on each enum of the *PatternTree* (for the corresponding syntax tree types). For example, the `IsMatch` implementation for matching `ast::LitKind` against the *PatternTree's* `Lit` enum might look like this: + +``` +impl IsMatch for Lit { + fn is_match(&self, other: &ast::LitKind) -> bool { + match (self, other) { + (Lit::Char(i), ast::LitKind::Char(j)) => i.is_match(j), + (Lit::Bool(i), ast::LitKind::Bool(j)) => i.is_match(j), + (Lit::Int(i), ast::LitKind::Int(j, _)) => i.is_match(j), + _ => false, + } + } +} +``` + +All `IsMatch` implementations for matching the current *PatternTree* against `syntax::ast` can be found [here](https://github.com/fkohlgrueber/pattern-matching/blob/dfb3bc9fbab69cec7c91e72564a63ebaa2ede638/pattern-match/src/ast_match.rs). + + +# Drawbacks +[drawbacks]: #drawbacks + +#### Performance + +The pattern matching code is currently not optimized for performance, so it might be slower than hand-written matching code. +Additionally, the two-stage approach (matching against the coarse pattern first and checking for additional properties later) might be slower than the current practice of checking for structure and additional properties in one pass. For example, the following lint + +``` +pattern!{ + pat_if_without_else: Expr = + If( + _, + Block( + Expr( If(_, _, ())#inner ) + | Semi( If(_, _, ())#inner ) + )#then, + () + ) +} +... +fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &ast::Expr) { + if let Some(result) = pat_if_without_else(expr) { + if !block_starts_with_comment(cx, result.then) { + ... + } +} +``` + +first matches against the pattern and then checks that the `then` block doesn't start with a comment. Using clippy's current approach, it's possible to check for these conditions earlier: + +``` +fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &ast::Expr) { + if_chain! { + if let ast::ExprKind::If(ref check, ref then, None) = expr.node; + if !block_starts_with_comment(cx, then); + if let Some(inner) = expr_block(then); + if let ast::ExprKind::If(ref check_inner, ref content, None) = inner.node; + then { + ... + } + } +} +``` + +Whether or not this causes performance regressions depends on actual patterns. If it turns out to be a problem, the pattern matching algorithms could be extended to allow "early filtering" (see the [Early Filtering](#early-filtering) section in Future Possibilities). + +That being said, I don't see any conceptual limitations regarding pattern matching performance. + +#### Applicability + +Even though I'd expect that a lot of lints can be written using the proposed pattern syntax, it's unlikely that all lints can be expressed using patterns. I suspect that there will still be lints that need to be implemented by writing custom pattern matching code. This would lead to mix within clippy's codebase where some lints are implemented using patterns and others aren't. This inconsistency might be considered a drawback. + + +# Rationale and alternatives +[rationale-and-alternatives]: #rationale-and-alternatives + +Specifying lints using syntax tree patterns has a couple of advantages compared to the current approach of manually writing matching code. First, syntax tree patterns allow users to describe patterns in a simple and expressive way. This makes it easier to write new lints for both novices and experts and also makes reading / modifying existing lints simpler. + +Another advantage is that lints are independent of specific syntax tree implementations (e.g. AST / HIR, ...). When these syntax tree implementations change, only the `IsMatch` trait implementations need to be adapted and existing lints can remain unchanged. This also means that if the `IsMatch` trait implementations were integrated into the compiler, updating the `IsMatch` implementations would be required for the compiler to compile successfully. This could reduce the number of times clippy breaks because of changes in the compiler. Another advantage of the pattern's independence is that converting an `EarlyLintPass` lint into a `LatePassLint` wouldn't require rewriting the whole pattern matching code. In fact, the pattern might work just fine without any adaptions. + + + +## Alternatives + +### Rust-like pattern syntax + +The proposed pattern syntax requires users to know the structure of the `PatternTree` (which is very similar to the AST's / HIR's structure) and also the pattern syntax. An alternative would be to introduce a pattern syntax that is similar to actual Rust syntax (probably like the `quote!` macro). For example, a pattern that matches `if` expressions that have `false` in their condition could look like this: + +``` +if false { + #[*] +} +``` + +#### Problems + +Extending Rust syntax (which is quite complex by itself) with additional syntax needed for specifying patterns (alternations, sequences, repetisions, named submatches, ...) might become difficult to read and really hard to parse properly. + +For example, a pattern that matches a binary operation that has `0` on both sides might look like this: + +``` +0 #[*:BinOpKind] 0 +``` + +Now consider this slightly more complex example: + +``` +1 + 0 #[*:BinOpKind] 0 +``` + +The parser would need to know the precedence of `#[*:BinOpKind]` because it affects the structure of the resulting AST. `1 + 0 + 0` is parsed as `(1 + 0) + 0` while `1 + 0 * 0` is parsed as `1 + (0 * 0)`. Since the pattern could be any `BinOpKind`, the precedence cannot be known in advance. + +Another example of a problem would be named submatches. Take a look at this pattern: + +``` +fn test() { + 1 #foo +} +``` + +Which node is `#foo` referring to? `int`, `ast::Lit`, `ast::Expr`, `ast::Stmt`? Naming subpatterns in a rust-like syntax is difficult because a lot of AST nodes don't have a syntactic element that can be used to put the name tag on. In these situations, the only sensible option would be to assign the name tag to the outermost node (`ast::Stmt` in the example above), because the information of all child nodes can be retrieved through the outermost node. The problem with this then would be that accessing inner nodes (like `ast::Lit`) would again require manual pattern matching. + +In general, Rust syntax contains a lot of code structure implicitly. This structure is reconstructed during parsing (e.g. binary operations are reconstructed using operator precedence and left-to-right) and is one of the reasons why parsing is a complex task. The advantage of this approach is that writing code is simpler for users. + +When writing *syntax tree patterns*, each element of the hierarchy might have alternatives, repetitions, etc.. Respecting that while still allowing human-friendly syntax that contains structure implicitly seems to be really complex, if not impossible. + +Developing such a syntax would also require to maintain a custom parser that is at least as complex as the Rust parser itself. Additionally, future changes in the Rust syntax might be incompatible with such a syntax. + +In summary, I think that developing such a syntax would introduce a lot of complexity to solve a relatively minor problem. + +The issue of users not knowing about the *PatternTree* structure could be solved by a tool that, given a rust program, generates a pattern that matches only this program (similar to the clippy author lint). + +For some simple cases (like the first example above), it might be possible to successfully mix Rust and pattern syntax. This space could be further explored in a future extension. + +# Prior art +[prior-art]: #prior-art + +The pattern syntax is heavily inspired by regular expressions (repetitions, alternatives, sequences, ...). + +From what I've seen until now, other linters also implement lints that directly work on syntax tree data structures, just like clippy does currently. I would therefore consider the pattern syntax to be *new*, but please correct me if I'm wrong. + +# Unresolved questions +[unresolved-questions]: #unresolved-questions + +#### How to handle multiple matches? + +When matching a syntax tree node against a pattern, there are possibly multiple ways in which the pattern can be matched. A simple example of this would be the following pattern: + +``` +pattern!{ + my_pattern: Expr = + Array( _* Lit(_)+#literals) +} +``` + +This pattern matches arrays that end with at least one literal. Now given the array `[x, 1, 2]`, should `1` be matched as part of the `_*` or the `Lit(_)+` part of the pattern? The difference is important because the named submatch `#literals` would contain 1 or 2 elements depending how the pattern is matched. In regular expressions, this problem is solved by matching "greedy" by default and "non-greedy" optionally. + +I haven't looked much into this yet because I don't know how relevant it is for most lints. The current implementation simply returns the first match it finds. + +# Future possibilities +[future-possibilities]: #future-possibilities + +#### Implement rest of Rust Syntax + +The current project only implements a small part of the Rust syntax. In the future, this should incrementally be extended to more syntax to allow implementing more lints. Implementing more of the Rust syntax requires extending the `PatternTree` and `IsMatch` implementations, but should be relatively straight-forward. + +#### Early filtering + +As described in the *Drawbacks/Performance* section, allowing additional checks during the pattern matching might be beneficial. + +The pattern below shows how this could look like: + +``` +pattern!{ + pat_if_without_else: Expr = + If( + _, + Block( + Expr( If(_, _, ())#inner ) + | Semi( If(_, _, ())#inner ) + )#then, + () + ) + where + !in_macro(#then.span); +} +``` + +The difference compared to the currently proposed two-stage filtering is that using early filtering, the condition (`!in_macro(#then.span)` in this case) would be evaluated as soon as the `Block(_)#then` was matched. + +Another idea in this area would be to introduce a syntax for backreferences. They could be used to require that multiple parts of a pattern should match the same value. For example, the `assign_op_pattern` lint that searches for `a = a op b` and recommends changing it to `a op= b` requires that both occurrances of `a` are the same. Using `=#...` as syntax for backreferences, the lint could be implemented like this: + +``` +pattern!{ + assign_op_pattern: Expr = + Assign(_#target, Binary(_, =#target, _) +} +``` + +#### Match descendant + +A lot of lints currently implement custom visitors that check whether any subtree (which might not be a direct descendant) of the current node matches some properties. This cannot be expressed with the proposed pattern syntax. Extending the pattern syntax to allow patterns like "a function that contains at least two return statements" could be a practical addition. + +#### Negation operator for alternatives + +For patterns like "a literal that is not a boolean literal" one currently needs to list all alternatives except the boolean case. Introducing a negation operator that allows to write `Lit(!Bool(_))` might be a good idea. This pattern would be eqivalent to `Lit( Char(_) | Int(_) )` (given that currently only three literal types are implemented). + +#### Functional composition + +Patterns currently don't have any concept of composition. This leads to repetitions within patterns. For example, one of the collapsible-if patterns currently has to be written like this: + +``` +pattern!{ + pat_if_else: Expr = + If( + _, + _, + Block_( + Block( + Expr((If(_, _, _?) | IfLet(_, _?))#else_) | + Semi((If(_, _, _?) | IfLet(_, _?))#else_) + )#block_inner + )#block + ) | + IfLet( + _, + Block_( + Block( + Expr((If(_, _, _?) | IfLet(_, _?))#else_) | + Semi((If(_, _, _?) | IfLet(_, _?))#else_) + )#block_inner + )#block + ) +} +``` + +If patterns supported defining functions of subpatterns, the code could be simplified as follows: + +``` +pattern!{ + fn expr_or_semi(expr: Expr) -> Stmt { + Expr(expr) | Semi(expr) + } + fn if_or_if_let(then: Block, else: Opt) -> Expr { + If(_, then, else) | IfLet(then, else) + } + pat_if_else: Expr = + if_or_if_let( + _, + Block_( + Block( + expr_or_semi( if_or_if_let(_, _?)#else_ ) + )#block_inner + )#block + ) +} +``` + +Additionally, common patterns like `expr_or_semi` could be shared between different lints. + +#### Clippy Pattern Author + +Another improvement could be to create a tool that, given some valid Rust syntax, generates a pattern that matches this syntax exactly. This would make starting to write a pattern easier. A user could take a look at the patterns generated for a couple of Rust code examples and use that information to write a pattern that matches all of them. + +This is similar to clippy's author lint. + +#### Supporting other syntaxes + +Most of the proposed system is language-agnostic. For example, the pattern syntax could also be used to describe patterns for other programming languages. + +In order to support other languages' syntaxes, one would need to implement another `PatternTree` that sufficiently describes the languages' AST and implement `IsMatch` for this `PatternTree` and the languages' AST. + +One aspect of this is that it would even be possible to write lints that work on the pattern syntax itself. For example, when writing the following pattern + + +``` +pattern!{ + my_pattern: Expr = + Array( Lit(Bool(false)) Lit(Bool(false)) ) +} +``` + +a lint that works on the pattern syntax's AST could suggest using this pattern instead: + +``` +pattern!{ + my_pattern: Expr = + Array( Lit(Bool(false)){2} ) +} +``` + +In the future, clippy could use this system to also provide lints for custom syntaxes like those found in macros. + +# Final Note + +This is the first RFC I've ever written and it might be a little rough around the edges. + +I'm looking forward to hearing your feedback and discussing the proposal. From ad9ad6f402e3e15706519e59ef111a941d28d5af Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 17:42:57 +1200 Subject: [PATCH 0002/4780] Don't negate resulted offsets when `offset` is subtraction by 0 --- clippy_lints/src/loops.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index cb44eccae..f16b98883 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -960,8 +960,8 @@ fn detect_manual_memcpy<'a, 'tcx>( let print_sum = |arg1: &Offset, arg2: &Offset| -> String { match (&arg1.value[..], arg1.negate, &arg2.value[..], arg2.negate) { ("0", _, "0", _) => "".into(), - ("0", _, x, false) | (x, false, "0", false) => x.into(), - ("0", _, x, true) | (x, false, "0", true) => format!("-{}", x), + ("0", _, x, false) | (x, false, "0", _) => x.into(), + ("0", _, x, true) => format!("-{}", x), (x, false, y, false) => format!("({} + {})", x, y), (x, false, y, true) => { if x == y { From 37261a904ce2fbd4137180500c57f75f29945828 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 17:51:01 +1200 Subject: [PATCH 0003/4780] Print 0 when `end` and `offset` is 0, and also simplify the suggestion --- clippy_lints/src/loops.rs | 15 ++++++++++++--- tests/ui/manual_memcpy.stderr | 4 ++-- 2 files changed, 14 insertions(+), 5 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index f16b98883..6b5a8498d 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -959,7 +959,7 @@ fn detect_manual_memcpy<'a, 'tcx>( if let PatKind::Binding(_, canonical_id, _, _) = pat.kind { let print_sum = |arg1: &Offset, arg2: &Offset| -> String { match (&arg1.value[..], arg1.negate, &arg2.value[..], arg2.negate) { - ("0", _, "0", _) => "".into(), + ("0", _, "0", _) => "0".into(), ("0", _, x, false) | (x, false, "0", _) => x.into(), ("0", _, x, true) => format!("-{}", x), (x, false, y, false) => format!("({} + {})", x, y), @@ -981,6 +981,15 @@ fn detect_manual_memcpy<'a, 'tcx>( } }; + let print_offset = |start_str: &Offset, inline_offset: &Offset| -> String { + let offset = print_sum(start_str, inline_offset); + if offset.as_str() == "0" { + "".into() + } else { + offset + } + }; + let print_limit = |end: &Option<&Expr<'_>>, offset: Offset, var_name: &str| { if let Some(end) = *end { if_chain! { @@ -1020,9 +1029,9 @@ fn detect_manual_memcpy<'a, 'tcx>( .into_iter() .map(|(dst_var, src_var)| { let start_str = Offset::positive(snippet(cx, start.span, "").to_string()); - let dst_offset = print_sum(&start_str, &dst_var.offset); + let dst_offset = print_offset(&start_str, &dst_var.offset); let dst_limit = print_limit(end, dst_var.offset, &dst_var.var_name); - let src_offset = print_sum(&start_str, &src_var.offset); + let src_offset = print_offset(&start_str, &src_var.offset); let src_limit = print_limit(end, src_var.offset, &src_var.var_name); let dst = if dst_offset == "" && dst_limit == "" { dst_var.var_name diff --git a/tests/ui/manual_memcpy.stderr b/tests/ui/manual_memcpy.stderr index 3dbb2155d..ec80f6070 100644 --- a/tests/ui/manual_memcpy.stderr +++ b/tests/ui/manual_memcpy.stderr @@ -58,13 +58,13 @@ error: it looks like you're manually copying between slices --> $DIR/manual_memcpy.rs:94:14 | LL | for i in from..from + src.len() { - | ^^^^^^^^^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[from..from + src.len()].clone_from_slice(&src[0..(from + src.len() - from)])` + | ^^^^^^^^^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[from..from + src.len()].clone_from_slice(&src[..(from + src.len() - from)])` error: it looks like you're manually copying between slices --> $DIR/manual_memcpy.rs:98:14 | LL | for i in from..from + 3 { - | ^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[from..from + 3].clone_from_slice(&src[0..(from + 3 - from)])` + | ^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[from..from + 3].clone_from_slice(&src[..(from + 3 - from)])` error: it looks like you're manually copying between slices --> $DIR/manual_memcpy.rs:105:14 From 75ad839cd26c1da17fe6ba3aae1153ee96de26c8 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 18:04:37 +1200 Subject: [PATCH 0004/4780] Do not trigger `manual_memcpy` for `RangeTo` --- clippy_lints/src/loops.rs | 52 ++++++++++++++++------------------- tests/ui/manual_memcpy.rs | 5 ++++ tests/ui/manual_memcpy.stderr | 2 +- 3 files changed, 30 insertions(+), 29 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 6b5a8498d..ca61c97e3 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -951,7 +951,7 @@ fn detect_manual_memcpy<'a, 'tcx>( ) { if let Some(higher::Range { start: Some(start), - ref end, + end: Some(end), limits, }) = higher::range(cx, arg) { @@ -990,35 +990,31 @@ fn detect_manual_memcpy<'a, 'tcx>( } }; - let print_limit = |end: &Option<&Expr<'_>>, offset: Offset, var_name: &str| { - if let Some(end) = *end { - if_chain! { - if let ExprKind::MethodCall(ref method, _, ref len_args) = end.kind; - if method.ident.name == sym!(len); - if len_args.len() == 1; - if let Some(arg) = len_args.get(0); - if snippet(cx, arg.span, "??") == var_name; - then { - return if offset.negate { - format!("({} - {})", snippet(cx, end.span, ".len()"), offset.value) - } else { - String::new() - }; - } + let print_limit = |end: &Expr<'_>, offset: Offset, var_name: &str| { + if_chain! { + if let ExprKind::MethodCall(ref method, _, ref len_args) = end.kind; + if method.ident.name == sym!(len); + if len_args.len() == 1; + if let Some(arg) = len_args.get(0); + if snippet(cx, arg.span, "??") == var_name; + then { + return if offset.negate { + format!("({} - {})", snippet(cx, end.span, ".len()"), offset.value) + } else { + String::new() + }; } - - let end_str = match limits { - ast::RangeLimits::Closed => { - let end = sugg::Sugg::hir(cx, end, ""); - format!("{}", end + sugg::ONE) - }, - ast::RangeLimits::HalfOpen => format!("{}", snippet(cx, end.span, "..")), - }; - - print_sum(&Offset::positive(end_str), &offset) - } else { - "..".into() } + + let end_str = match limits { + ast::RangeLimits::Closed => { + let end = sugg::Sugg::hir(cx, end, ""); + format!("{}", end + sugg::ONE) + }, + ast::RangeLimits::HalfOpen => format!("{}", snippet(cx, end.span, "..")), + }; + + print_sum(&Offset::positive(end_str), &offset) }; // The only statements in the for loops can be indexed assignments from diff --git a/tests/ui/manual_memcpy.rs b/tests/ui/manual_memcpy.rs index aa3472888..1f41838fa 100644 --- a/tests/ui/manual_memcpy.rs +++ b/tests/ui/manual_memcpy.rs @@ -98,6 +98,11 @@ pub fn manual_copy(src: &[i32], dst: &mut [i32], dst2: &mut [i32]) { for i in from..from + 3 { dst[i] = src[i - from]; } + + // `RangeTo` `for` loop - don't trigger lint + for i in 0.. { + dst[i] = src[i]; + } } #[warn(clippy::needless_range_loop, clippy::manual_memcpy)] diff --git a/tests/ui/manual_memcpy.stderr b/tests/ui/manual_memcpy.stderr index ec80f6070..95114c46f 100644 --- a/tests/ui/manual_memcpy.stderr +++ b/tests/ui/manual_memcpy.stderr @@ -67,7 +67,7 @@ LL | for i in from..from + 3 { | ^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[from..from + 3].clone_from_slice(&src[..(from + 3 - from)])` error: it looks like you're manually copying between slices - --> $DIR/manual_memcpy.rs:105:14 + --> $DIR/manual_memcpy.rs:110:14 | LL | for i in 0..src.len() { | ^^^^^^^^^^^^ help: try replacing the loop by: `dst[..src.len()].clone_from_slice(&src[..])` From c94f0f49f8e025aae11534f9f2b4c59c34b1edb8 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 18:22:10 +1200 Subject: [PATCH 0005/4780] Remove all `ref` keyword --- clippy_lints/src/loops.rs | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index ca61c97e3..502bd4221 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -772,8 +772,8 @@ fn check_for_loop<'a, 'tcx>( fn same_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, var: HirId) -> bool { if_chain! { - if let ExprKind::Path(ref qpath) = expr.kind; - if let QPath::Resolved(None, ref path) = *qpath; + if let ExprKind::Path(qpath) = &expr.kind; + if let QPath::Resolved(None, path) = qpath; if path.segments.len() == 1; if let Res::Local(local_id) = qpath_res(cx, qpath, expr.hir_id); // our variable! @@ -821,8 +821,8 @@ fn is_slice_like<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, ty: Ty<'_>) -> bool { fn get_fixed_offset_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, var: HirId) -> Option { fn extract_offset<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, e: &Expr<'_>, var: HirId) -> Option { - match e.kind { - ExprKind::Lit(ref l) => match l.node { + match &e.kind { + ExprKind::Lit(l) => match l.node { ast::LitKind::Int(x, _ty) => Some(x.to_string()), _ => None, }, @@ -831,14 +831,14 @@ fn get_fixed_offset_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, v } } - if let ExprKind::Index(ref seqexpr, ref idx) = expr.kind { + if let ExprKind::Index(seqexpr, idx) = expr.kind { let ty = cx.tables.expr_ty(seqexpr); if !is_slice_like(cx, ty) { return None; } let offset = match idx.kind { - ExprKind::Binary(op, ref lhs, ref rhs) => match op.node { + ExprKind::Binary(op, lhs, rhs) => match op.node { BinOpKind::Add => { let offset_opt = if same_var(cx, lhs, var) { extract_offset(cx, rhs, var) @@ -878,7 +878,7 @@ fn fetch_cloned_fixed_offset_var<'a, 'tcx>( var: HirId, ) -> Option { if_chain! { - if let ExprKind::MethodCall(ref method, _, ref args) = expr.kind; + if let ExprKind::MethodCall(method, _, args) = expr.kind; if method.ident.name == sym!(clone); if args.len() == 1; if let Some(arg) = args.get(0); @@ -900,7 +900,7 @@ fn get_indexed_assignments<'a, 'tcx>( e: &Expr<'_>, var: HirId, ) -> Option<(FixedOffsetVar, FixedOffsetVar)> { - if let ExprKind::Assign(ref lhs, ref rhs, _) = e.kind { + if let ExprKind::Assign(lhs, rhs, _) = e.kind { match ( get_fixed_offset_var(cx, lhs, var), fetch_cloned_fixed_offset_var(cx, rhs, var), @@ -920,16 +920,14 @@ fn get_indexed_assignments<'a, 'tcx>( } } - if let ExprKind::Block(ref b, _) = body.kind { - let Block { - ref stmts, ref expr, .. - } = **b; + if let ExprKind::Block(b, _) = body.kind { + let Block { stmts, expr, .. } = *b; stmts .iter() .map(|stmt| match stmt.kind { StmtKind::Local(..) | StmtKind::Item(..) => None, - StmtKind::Expr(ref e) | StmtKind::Semi(ref e) => Some(get_assignment(cx, e, var)), + StmtKind::Expr(e) | StmtKind::Semi(e) => Some(get_assignment(cx, e, var)), }) .chain(expr.as_ref().into_iter().map(|e| Some(get_assignment(cx, &*e, var)))) .filter_map(|op| op) @@ -992,7 +990,7 @@ fn detect_manual_memcpy<'a, 'tcx>( let print_limit = |end: &Expr<'_>, offset: Offset, var_name: &str| { if_chain! { - if let ExprKind::MethodCall(ref method, _, ref len_args) = end.kind; + if let ExprKind::MethodCall(method, _, len_args) = end.kind; if method.ident.name == sym!(len); if len_args.len() == 1; if let Some(arg) = len_args.get(0); From 7dd0f3459f558c1b557223a042f549b378cacae9 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 18:47:24 +1200 Subject: [PATCH 0006/4780] Refactor `if` to use `else` and iterator combinators --- clippy_lints/src/loops.rs | 50 +++++++++++++++++---------------------- 1 file changed, 22 insertions(+), 28 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 502bd4221..3dd3a79b2 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -779,11 +779,11 @@ fn same_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, var: HirId) - // our variable! if local_id == var; then { - return true; + true + } else { + false } } - - false } struct Offset { @@ -853,13 +853,7 @@ fn get_fixed_offset_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, v BinOpKind::Sub if same_var(cx, lhs, var) => extract_offset(cx, rhs, var).map(Offset::negative), _ => None, }, - ExprKind::Path(..) => { - if same_var(cx, idx, var) { - Some(Offset::positive("0".into())) - } else { - None - } - }, + ExprKind::Path(..) if same_var(cx, idx, var) => Some(Offset::positive("0".into())), _ => None, }; @@ -883,11 +877,11 @@ fn fetch_cloned_fixed_offset_var<'a, 'tcx>( if args.len() == 1; if let Some(arg) = args.get(0); then { - return get_fixed_offset_var(cx, arg, var); + get_fixed_offset_var(cx, arg, var) + } else { + get_fixed_offset_var(cx, expr, var) } } - - get_fixed_offset_var(cx, expr, var) } fn get_indexed_assignments<'a, 'tcx>( @@ -925,12 +919,12 @@ fn get_indexed_assignments<'a, 'tcx>( stmts .iter() - .map(|stmt| match stmt.kind { + .filter_map(|stmt| match stmt.kind { StmtKind::Local(..) | StmtKind::Item(..) => None, - StmtKind::Expr(e) | StmtKind::Semi(e) => Some(get_assignment(cx, e, var)), + StmtKind::Expr(e) | StmtKind::Semi(e) => Some(e), }) - .chain(expr.as_ref().into_iter().map(|e| Some(get_assignment(cx, &*e, var)))) - .filter_map(|op| op) + .chain(expr.into_iter()) + .map(|op| get_assignment(cx, op, var)) .collect::>>() .unwrap_or_default() } else { @@ -996,23 +990,23 @@ fn detect_manual_memcpy<'a, 'tcx>( if let Some(arg) = len_args.get(0); if snippet(cx, arg.span, "??") == var_name; then { - return if offset.negate { + if offset.negate { format!("({} - {})", snippet(cx, end.span, ".len()"), offset.value) } else { String::new() + } + } else { + let end_str = match limits { + ast::RangeLimits::Closed => { + let end = sugg::Sugg::hir(cx, end, ""); + format!("{}", end + sugg::ONE) + }, + ast::RangeLimits::HalfOpen => format!("{}", snippet(cx, end.span, "..")), }; + + print_sum(&Offset::positive(end_str), &offset) } } - - let end_str = match limits { - ast::RangeLimits::Closed => { - let end = sugg::Sugg::hir(cx, end, ""); - format!("{}", end + sugg::ONE) - }, - ast::RangeLimits::HalfOpen => format!("{}", snippet(cx, end.span, "..")), - }; - - print_sum(&Offset::positive(end_str), &offset) }; // The only statements in the for loops can be indexed assignments from From 3f1e51b3f4a7bfb42c442caf2cb836ba62e2ba53 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 18:57:36 +1200 Subject: [PATCH 0007/4780] Rename `negate` to `sign` and make it strong types then make `art1` &str --- clippy_lints/src/loops.rs | 56 +++++++++++++++++++-------------------- 1 file changed, 28 insertions(+), 28 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 3dd3a79b2..321d5265d 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -786,20 +786,29 @@ fn same_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, var: HirId) - } } +#[derive(Clone, Copy)] +enum OffsetSign { + Positive, + Negative, +} + struct Offset { value: String, - negate: bool, + sign: OffsetSign, } impl Offset { - fn negative(s: String) -> Self { - Self { value: s, negate: true } + fn negative(value: String) -> Self { + Self { + value, + sign: OffsetSign::Negative, + } } - fn positive(s: String) -> Self { + fn positive(value: String) -> Self { Self { - value: s, - negate: false, + value, + sign: OffsetSign::Positive, } } } @@ -949,31 +958,23 @@ fn detect_manual_memcpy<'a, 'tcx>( { // the var must be a single name if let PatKind::Binding(_, canonical_id, _, _) = pat.kind { - let print_sum = |arg1: &Offset, arg2: &Offset| -> String { - match (&arg1.value[..], arg1.negate, &arg2.value[..], arg2.negate) { - ("0", _, "0", _) => "0".into(), - ("0", _, x, false) | (x, false, "0", _) => x.into(), - ("0", _, x, true) => format!("-{}", x), - (x, false, y, false) => format!("({} + {})", x, y), - (x, false, y, true) => { + let print_sum = |arg1: &str, arg2: &Offset| -> String { + match (arg1, &arg2.value[..], arg2.sign) { + ("0", "0", _) => "0".into(), + ("0", x, OffsetSign::Positive) | (x, "0", _) => x.into(), + ("0", x, OffsetSign::Negative) => format!("-{}", x), + (x, y, OffsetSign::Positive) => format!("({} + {})", x, y), + (x, y, OffsetSign::Negative) => { if x == y { "0".into() } else { format!("({} - {})", x, y) } }, - (x, true, y, false) => { - if x == y { - "0".into() - } else { - format!("({} - {})", y, x) - } - }, - (x, true, y, true) => format!("-({} + {})", x, y), } }; - let print_offset = |start_str: &Offset, inline_offset: &Offset| -> String { + let print_offset = |start_str: &str, inline_offset: &Offset| -> String { let offset = print_sum(start_str, inline_offset); if offset.as_str() == "0" { "".into() @@ -990,10 +991,9 @@ fn detect_manual_memcpy<'a, 'tcx>( if let Some(arg) = len_args.get(0); if snippet(cx, arg.span, "??") == var_name; then { - if offset.negate { - format!("({} - {})", snippet(cx, end.span, ".len()"), offset.value) - } else { - String::new() + match offset.sign { + OffsetSign::Negative => format!("({} - {})", snippet(cx, end.span, ".len()"), offset.value), + OffsetSign::Positive => "".into(), } } else { let end_str = match limits { @@ -1004,7 +1004,7 @@ fn detect_manual_memcpy<'a, 'tcx>( ast::RangeLimits::HalfOpen => format!("{}", snippet(cx, end.span, "..")), }; - print_sum(&Offset::positive(end_str), &offset) + print_sum(&end_str, &offset) } } }; @@ -1016,7 +1016,7 @@ fn detect_manual_memcpy<'a, 'tcx>( let big_sugg = manual_copies .into_iter() .map(|(dst_var, src_var)| { - let start_str = Offset::positive(snippet(cx, start.span, "").to_string()); + let start_str = snippet(cx, start.span, "").to_string(); let dst_offset = print_offset(&start_str, &dst_var.offset); let dst_limit = print_limit(end, dst_var.offset, &dst_var.var_name); let src_offset = print_offset(&start_str, &src_var.offset); From ecb472c052c746d87ce26f6b184f2c5f11537e0c Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 19:02:08 +1200 Subject: [PATCH 0008/4780] Use `fn` instead of closures where unnecessary --- clippy_lints/src/loops.rs | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 321d5265d..e37c44dc0 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -958,7 +958,7 @@ fn detect_manual_memcpy<'a, 'tcx>( { // the var must be a single name if let PatKind::Binding(_, canonical_id, _, _) = pat.kind { - let print_sum = |arg1: &str, arg2: &Offset| -> String { + fn print_sum(arg1: &str, arg2: &Offset) -> String { match (arg1, &arg2.value[..], arg2.sign) { ("0", "0", _) => "0".into(), ("0", x, OffsetSign::Positive) | (x, "0", _) => x.into(), @@ -972,16 +972,16 @@ fn detect_manual_memcpy<'a, 'tcx>( } }, } - }; + } - let print_offset = |start_str: &str, inline_offset: &Offset| -> String { + fn print_offset(start_str: &str, inline_offset: &Offset) -> String { let offset = print_sum(start_str, inline_offset); if offset.as_str() == "0" { "".into() } else { offset } - }; + } let print_limit = |end: &Expr<'_>, offset: Offset, var_name: &str| { if_chain! { From aab80eedf3e271ada92a6509727461cc3aa6bb12 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 19:04:56 +1200 Subject: [PATCH 0009/4780] Extract `get_fixed_offset_var`` from `fetch_cloned_fixed_offset_var` --- clippy_lints/src/loops.rs | 30 +++++++++++------------------- 1 file changed, 11 insertions(+), 19 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index e37c44dc0..2dc95f530 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -828,6 +828,16 @@ fn is_slice_like<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, ty: Ty<'_>) -> bool { is_slice || is_type_diagnostic_item(cx, ty, sym!(vec_type)) || is_type_diagnostic_item(cx, ty, sym!(vecdeque_type)) } +fn fetch_cloned_expr<'tcx>(expr: &'tcx Expr<'tcx>) -> &'tcx Expr<'tcx> { + if_chain! { + if let ExprKind::MethodCall(method, _, args) = expr.kind; + if method.ident.name == sym!(clone); + if args.len() == 1; + if let Some(arg) = args.get(0); + then { arg } else { expr } + } +} + fn get_fixed_offset_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, var: HirId) -> Option { fn extract_offset<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, e: &Expr<'_>, var: HirId) -> Option { match &e.kind { @@ -875,24 +885,6 @@ fn get_fixed_offset_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, v } } -fn fetch_cloned_fixed_offset_var<'a, 'tcx>( - cx: &LateContext<'a, 'tcx>, - expr: &Expr<'_>, - var: HirId, -) -> Option { - if_chain! { - if let ExprKind::MethodCall(method, _, args) = expr.kind; - if method.ident.name == sym!(clone); - if args.len() == 1; - if let Some(arg) = args.get(0); - then { - get_fixed_offset_var(cx, arg, var) - } else { - get_fixed_offset_var(cx, expr, var) - } - } -} - fn get_indexed_assignments<'a, 'tcx>( cx: &LateContext<'a, 'tcx>, body: &Expr<'_>, @@ -906,7 +898,7 @@ fn get_indexed_assignments<'a, 'tcx>( if let ExprKind::Assign(lhs, rhs, _) = e.kind { match ( get_fixed_offset_var(cx, lhs, var), - fetch_cloned_fixed_offset_var(cx, rhs, var), + get_fixed_offset_var(cx, fetch_cloned_expr(rhs), var), ) { (Some(offset_left), Some(offset_right)) => { // Source and destination must be different From 3d121d53af9a73ba11226715cd8132f6981ffee9 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 19:15:51 +1200 Subject: [PATCH 0010/4780] Extract roles getting indexes from `get_indexed_assignments` --- clippy_lints/src/loops.rs | 106 ++++++++++++++++++++------------------ 1 file changed, 55 insertions(+), 51 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 2dc95f530..0753b23e4 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -10,7 +10,6 @@ use crate::utils::{ }; use crate::utils::{is_type_diagnostic_item, qpath_res, same_tys, sext, sugg}; use if_chain::if_chain; -use itertools::Itertools; use rustc_ast::ast; use rustc_data_structures::fx::{FxHashMap, FxHashSet}; use rustc_errors::Applicability; @@ -885,52 +884,39 @@ fn get_fixed_offset_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, v } } -fn get_indexed_assignments<'a, 'tcx>( - cx: &LateContext<'a, 'tcx>, - body: &Expr<'_>, - var: HirId, -) -> Vec<(FixedOffsetVar, FixedOffsetVar)> { - fn get_assignment<'a, 'tcx>( - cx: &LateContext<'a, 'tcx>, - e: &Expr<'_>, - var: HirId, - ) -> Option<(FixedOffsetVar, FixedOffsetVar)> { +fn get_assignments<'a, 'tcx>( + body: &'tcx Expr<'tcx>, +) -> impl Iterator, &'tcx Expr<'tcx>)>> { + fn get_assignment<'a, 'tcx>(e: &'tcx Expr<'tcx>) -> Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)> { if let ExprKind::Assign(lhs, rhs, _) = e.kind { - match ( - get_fixed_offset_var(cx, lhs, var), - get_fixed_offset_var(cx, fetch_cloned_expr(rhs), var), - ) { - (Some(offset_left), Some(offset_right)) => { - // Source and destination must be different - if offset_left.var_name == offset_right.var_name { - None - } else { - Some((offset_left, offset_right)) - } - }, - _ => None, - } + Some((lhs, rhs)) } else { None } } + // This is one of few ways to return different iterators + // derived from: https://stackoverflow.com/questions/29760668/conditionally-iterate-over-one-of-several-possible-iterators/52064434#52064434 + let mut iter_a = None; + let mut iter_b = None; + if let ExprKind::Block(b, _) = body.kind { let Block { stmts, expr, .. } = *b; - stmts + iter_a = stmts .iter() .filter_map(|stmt| match stmt.kind { StmtKind::Local(..) | StmtKind::Item(..) => None, StmtKind::Expr(e) | StmtKind::Semi(e) => Some(e), }) .chain(expr.into_iter()) - .map(|op| get_assignment(cx, op, var)) - .collect::>>() - .unwrap_or_default() + .map(get_assignment) + .into() } else { - get_assignment(cx, body, var).into_iter().collect() + iter_b = Some(get_assignment(body)) } + + iter_a.into_iter().flatten().chain(iter_b.into_iter()) } /// Checks for for loops that sequentially copy items from one slice-like @@ -1003,30 +989,48 @@ fn detect_manual_memcpy<'a, 'tcx>( // The only statements in the for loops can be indexed assignments from // indexed retrievals. - let manual_copies = get_indexed_assignments(cx, body, canonical_id); + let big_sugg = get_assignments(body) + .map(|o| { + o.and_then(|(lhs, rhs)| { + let rhs = fetch_cloned_expr(rhs); + if_chain! { + if let Some(offset_left) = get_fixed_offset_var(cx, lhs, canonical_id); + if let Some(offset_right) = get_fixed_offset_var(cx, rhs, canonical_id); - let big_sugg = manual_copies - .into_iter() - .map(|(dst_var, src_var)| { - let start_str = snippet(cx, start.span, "").to_string(); - let dst_offset = print_offset(&start_str, &dst_var.offset); - let dst_limit = print_limit(end, dst_var.offset, &dst_var.var_name); - let src_offset = print_offset(&start_str, &src_var.offset); - let src_limit = print_limit(end, src_var.offset, &src_var.var_name); - let dst = if dst_offset == "" && dst_limit == "" { - dst_var.var_name - } else { - format!("{}[{}..{}]", dst_var.var_name, dst_offset, dst_limit) - }; - - format!( - "{}.clone_from_slice(&{}[{}..{}])", - dst, src_var.var_name, src_offset, src_limit - ) + // Source and destination must be different + if offset_left.var_name != offset_right.var_name; + then { + Some((offset_left, offset_right)) + } else { + return None + } + } + }) }) - .join("\n "); + .map(|o| { + o.map(|(dst_var, src_var)| { + let start_str = snippet(cx, start.span, "").to_string(); + let dst_offset = print_offset(&start_str, &dst_var.offset); + let dst_limit = print_limit(end, dst_var.offset, &dst_var.var_name); + let src_offset = print_offset(&start_str, &src_var.offset); + let src_limit = print_limit(end, src_var.offset, &src_var.var_name); + let dst = if dst_offset == "" && dst_limit == "" { + dst_var.var_name + } else { + format!("{}[{}..{}]", dst_var.var_name, dst_offset, dst_limit) + }; - if !big_sugg.is_empty() { + format!( + "{}.clone_from_slice(&{}[{}..{}])", + dst, src_var.var_name, src_offset, src_limit + ) + }) + }) + .collect::>>() + .filter(|v| !v.is_empty()) + .map(|v| v.join("\n ")); + + if let Some(big_sugg) = big_sugg { span_lint_and_sugg( cx, MANUAL_MEMCPY, From 4f2617c059f693ec72e5d31ad31fd85eba019ab1 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 19:26:00 +1200 Subject: [PATCH 0011/4780] Separate getting offsets and getting index expressions --- clippy_lints/src/loops.rs | 63 +++++++++++++++++---------------------- 1 file changed, 28 insertions(+), 35 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 0753b23e4..75955997a 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -837,7 +837,7 @@ fn fetch_cloned_expr<'tcx>(expr: &'tcx Expr<'tcx>) -> &'tcx Expr<'tcx> { } } -fn get_fixed_offset_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, var: HirId) -> Option { +fn get_offset<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, idx: &Expr<'_>, var: HirId) -> Option { fn extract_offset<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, e: &Expr<'_>, var: HirId) -> Option { match &e.kind { ExprKind::Lit(l) => match l.node { @@ -849,38 +849,24 @@ fn get_fixed_offset_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, v } } - if let ExprKind::Index(seqexpr, idx) = expr.kind { - let ty = cx.tables.expr_ty(seqexpr); - if !is_slice_like(cx, ty) { - return None; - } + match idx.kind { + ExprKind::Binary(op, lhs, rhs) => match op.node { + BinOpKind::Add => { + let offset_opt = if same_var(cx, lhs, var) { + extract_offset(cx, rhs, var) + } else if same_var(cx, rhs, var) { + extract_offset(cx, lhs, var) + } else { + None + }; - let offset = match idx.kind { - ExprKind::Binary(op, lhs, rhs) => match op.node { - BinOpKind::Add => { - let offset_opt = if same_var(cx, lhs, var) { - extract_offset(cx, rhs, var) - } else if same_var(cx, rhs, var) { - extract_offset(cx, lhs, var) - } else { - None - }; - - offset_opt.map(Offset::positive) - }, - BinOpKind::Sub if same_var(cx, lhs, var) => extract_offset(cx, rhs, var).map(Offset::negative), - _ => None, + offset_opt.map(Offset::positive) }, - ExprKind::Path(..) if same_var(cx, idx, var) => Some(Offset::positive("0".into())), + BinOpKind::Sub if same_var(cx, lhs, var) => extract_offset(cx, rhs, var).map(Offset::negative), _ => None, - }; - - offset.map(|o| FixedOffsetVar { - var_name: snippet_opt(cx, seqexpr.span).unwrap_or_else(|| "???".into()), - offset: o, - }) - } else { - None + }, + ExprKind::Path(..) if same_var(cx, idx, var) => Some(Offset::positive("0".into())), + _ => None, } } @@ -994,15 +980,22 @@ fn detect_manual_memcpy<'a, 'tcx>( o.and_then(|(lhs, rhs)| { let rhs = fetch_cloned_expr(rhs); if_chain! { - if let Some(offset_left) = get_fixed_offset_var(cx, lhs, canonical_id); - if let Some(offset_right) = get_fixed_offset_var(cx, rhs, canonical_id); + if let ExprKind::Index(seqexpr_left, idx_left) = lhs.kind; + if let ExprKind::Index(seqexpr_right, idx_right) = rhs.kind; + if is_slice_like(cx, cx.tables.expr_ty(seqexpr_left)) + && is_slice_like(cx, cx.tables.expr_ty(seqexpr_right)); + if let Some(offset_left) = get_offset(cx, &idx_left, canonical_id); + if let Some(offset_right) = get_offset(cx, &idx_right, canonical_id); + let var_name_left = snippet_opt(cx, seqexpr_left.span).unwrap_or_else(|| "???".into()); + let var_name_right = snippet_opt(cx, seqexpr_right.span).unwrap_or_else(|| "???".into()); // Source and destination must be different - if offset_left.var_name != offset_right.var_name; + if var_name_left != var_name_right; then { - Some((offset_left, offset_right)) + Some((FixedOffsetVar { var_name: var_name_left, offset: offset_left }, + FixedOffsetVar { var_name: var_name_right, offset: offset_right })) } else { - return None + None } } }) From 9fc6f37778789de94caa280f41afdf651bf5ae10 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 19:34:41 +1200 Subject: [PATCH 0012/4780] Delay getting the snippet from slices --- clippy_lints/src/loops.rs | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 75955997a..8ab355566 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -812,8 +812,8 @@ impl Offset { } } -struct FixedOffsetVar { - var_name: String, +struct FixedOffsetVar<'hir> { + var: &'hir Expr<'hir>, offset: Offset, } @@ -947,13 +947,13 @@ fn detect_manual_memcpy<'a, 'tcx>( } } - let print_limit = |end: &Expr<'_>, offset: Offset, var_name: &str| { + let print_limit = |end: &Expr<'_>, offset: Offset, var: &Expr<'_>| { if_chain! { if let ExprKind::MethodCall(method, _, len_args) = end.kind; if method.ident.name == sym!(len); if len_args.len() == 1; if let Some(arg) = len_args.get(0); - if snippet(cx, arg.span, "??") == var_name; + if var_def_id(cx, arg) == var_def_id(cx, var); then { match offset.sign { OffsetSign::Negative => format!("({} - {})", snippet(cx, end.span, ".len()"), offset.value), @@ -986,14 +986,12 @@ fn detect_manual_memcpy<'a, 'tcx>( && is_slice_like(cx, cx.tables.expr_ty(seqexpr_right)); if let Some(offset_left) = get_offset(cx, &idx_left, canonical_id); if let Some(offset_right) = get_offset(cx, &idx_right, canonical_id); - let var_name_left = snippet_opt(cx, seqexpr_left.span).unwrap_or_else(|| "???".into()); - let var_name_right = snippet_opt(cx, seqexpr_right.span).unwrap_or_else(|| "???".into()); // Source and destination must be different - if var_name_left != var_name_right; + if var_def_id(cx, seqexpr_left) != var_def_id(cx, seqexpr_right); then { - Some((FixedOffsetVar { var_name: var_name_left, offset: offset_left }, - FixedOffsetVar { var_name: var_name_right, offset: offset_right })) + Some((FixedOffsetVar { var: seqexpr_left, offset: offset_left }, + FixedOffsetVar { var: seqexpr_right, offset: offset_right })) } else { None } @@ -1004,18 +1002,22 @@ fn detect_manual_memcpy<'a, 'tcx>( o.map(|(dst_var, src_var)| { let start_str = snippet(cx, start.span, "").to_string(); let dst_offset = print_offset(&start_str, &dst_var.offset); - let dst_limit = print_limit(end, dst_var.offset, &dst_var.var_name); + let dst_limit = print_limit(end, dst_var.offset, dst_var.var); let src_offset = print_offset(&start_str, &src_var.offset); - let src_limit = print_limit(end, src_var.offset, &src_var.var_name); + let src_limit = print_limit(end, src_var.offset, src_var.var); + + let dst_var_name = snippet_opt(cx, dst_var.var.span).unwrap_or_else(|| "???".into()); + let src_var_name = snippet_opt(cx, src_var.var.span).unwrap_or_else(|| "???".into()); + let dst = if dst_offset == "" && dst_limit == "" { - dst_var.var_name + dst_var_name } else { - format!("{}[{}..{}]", dst_var.var_name, dst_offset, dst_limit) + format!("{}[{}..{}]", dst_var_name, dst_offset, dst_limit) }; format!( "{}.clone_from_slice(&{}[{}..{}])", - dst, src_var.var_name, src_offset, src_limit + dst, src_var_name, src_offset, src_limit ) }) }) From 582614fbbe76fed1b06feb640229b71a1886ffd7 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 19:44:44 +1200 Subject: [PATCH 0013/4780] Extract building the suggestion of `manual_memcpy` --- clippy_lints/src/loops.rs | 154 ++++++++++++++++++++------------------ 1 file changed, 80 insertions(+), 74 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 8ab355566..7cf3e16be 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -905,6 +905,85 @@ fn get_assignments<'a, 'tcx>( iter_a.into_iter().flatten().chain(iter_b.into_iter()) } +fn build_manual_memcpy_suggestion<'a, 'tcx>( + cx: &LateContext<'a, 'tcx>, + start: &Expr<'_>, + end: &Expr<'_>, + limits: ast::RangeLimits, + dst_var: FixedOffsetVar<'_>, + src_var: FixedOffsetVar<'_>, +) -> String { + fn print_sum(arg1: &str, arg2: &Offset) -> String { + match (arg1, &arg2.value[..], arg2.sign) { + ("0", "0", _) => "0".into(), + ("0", x, OffsetSign::Positive) | (x, "0", _) => x.into(), + ("0", x, OffsetSign::Negative) => format!("-{}", x), + (x, y, OffsetSign::Positive) => format!("({} + {})", x, y), + (x, y, OffsetSign::Negative) => { + if x == y { + "0".into() + } else { + format!("({} - {})", x, y) + } + }, + } + } + + fn print_offset(start_str: &str, inline_offset: &Offset) -> String { + let offset = print_sum(start_str, inline_offset); + if offset.as_str() == "0" { + "".into() + } else { + offset + } + } + + let print_limit = |end: &Expr<'_>, offset: Offset, var: &Expr<'_>| { + if_chain! { + if let ExprKind::MethodCall(method, _, len_args) = end.kind; + if method.ident.name == sym!(len); + if len_args.len() == 1; + if let Some(arg) = len_args.get(0); + if var_def_id(cx, arg) == var_def_id(cx, var); + then { + match offset.sign { + OffsetSign::Negative => format!("({} - {})", snippet(cx, end.span, ".len()"), offset.value), + OffsetSign::Positive => "".into(), + } + } else { + let end_str = match limits { + ast::RangeLimits::Closed => { + let end = sugg::Sugg::hir(cx, end, ""); + format!("{}", end + sugg::ONE) + }, + ast::RangeLimits::HalfOpen => format!("{}", snippet(cx, end.span, "..")), + }; + + print_sum(&end_str, &offset) + } + } + }; + + let start_str = snippet(cx, start.span, "").to_string(); + let dst_offset = print_offset(&start_str, &dst_var.offset); + let dst_limit = print_limit(end, dst_var.offset, dst_var.var); + let src_offset = print_offset(&start_str, &src_var.offset); + let src_limit = print_limit(end, src_var.offset, src_var.var); + + let dst_var_name = snippet_opt(cx, dst_var.var.span).unwrap_or_else(|| "???".into()); + let src_var_name = snippet_opt(cx, src_var.var.span).unwrap_or_else(|| "???".into()); + + let dst = if dst_offset == "" && dst_limit == "" { + dst_var_name + } else { + format!("{}[{}..{}]", dst_var_name, dst_offset, dst_limit) + }; + + format!( + "{}.clone_from_slice(&{}[{}..{}])", + dst, src_var_name, src_offset, src_limit + ) +} /// Checks for for loops that sequentially copy items from one slice-like /// object to another. fn detect_manual_memcpy<'a, 'tcx>( @@ -922,57 +1001,6 @@ fn detect_manual_memcpy<'a, 'tcx>( { // the var must be a single name if let PatKind::Binding(_, canonical_id, _, _) = pat.kind { - fn print_sum(arg1: &str, arg2: &Offset) -> String { - match (arg1, &arg2.value[..], arg2.sign) { - ("0", "0", _) => "0".into(), - ("0", x, OffsetSign::Positive) | (x, "0", _) => x.into(), - ("0", x, OffsetSign::Negative) => format!("-{}", x), - (x, y, OffsetSign::Positive) => format!("({} + {})", x, y), - (x, y, OffsetSign::Negative) => { - if x == y { - "0".into() - } else { - format!("({} - {})", x, y) - } - }, - } - } - - fn print_offset(start_str: &str, inline_offset: &Offset) -> String { - let offset = print_sum(start_str, inline_offset); - if offset.as_str() == "0" { - "".into() - } else { - offset - } - } - - let print_limit = |end: &Expr<'_>, offset: Offset, var: &Expr<'_>| { - if_chain! { - if let ExprKind::MethodCall(method, _, len_args) = end.kind; - if method.ident.name == sym!(len); - if len_args.len() == 1; - if let Some(arg) = len_args.get(0); - if var_def_id(cx, arg) == var_def_id(cx, var); - then { - match offset.sign { - OffsetSign::Negative => format!("({} - {})", snippet(cx, end.span, ".len()"), offset.value), - OffsetSign::Positive => "".into(), - } - } else { - let end_str = match limits { - ast::RangeLimits::Closed => { - let end = sugg::Sugg::hir(cx, end, ""); - format!("{}", end + sugg::ONE) - }, - ast::RangeLimits::HalfOpen => format!("{}", snippet(cx, end.span, "..")), - }; - - print_sum(&end_str, &offset) - } - } - }; - // The only statements in the for loops can be indexed assignments from // indexed retrievals. let big_sugg = get_assignments(body) @@ -998,29 +1026,7 @@ fn detect_manual_memcpy<'a, 'tcx>( } }) }) - .map(|o| { - o.map(|(dst_var, src_var)| { - let start_str = snippet(cx, start.span, "").to_string(); - let dst_offset = print_offset(&start_str, &dst_var.offset); - let dst_limit = print_limit(end, dst_var.offset, dst_var.var); - let src_offset = print_offset(&start_str, &src_var.offset); - let src_limit = print_limit(end, src_var.offset, src_var.var); - - let dst_var_name = snippet_opt(cx, dst_var.var.span).unwrap_or_else(|| "???".into()); - let src_var_name = snippet_opt(cx, src_var.var.span).unwrap_or_else(|| "???".into()); - - let dst = if dst_offset == "" && dst_limit == "" { - dst_var_name - } else { - format!("{}[{}..{}]", dst_var_name, dst_offset, dst_limit) - }; - - format!( - "{}.clone_from_slice(&{}[{}..{}])", - dst, src_var_name, src_offset, src_limit - ) - }) - }) + .map(|o| o.map(|(dst, src)| build_manual_memcpy_suggestion(cx, start, end, limits, dst, src))) .collect::>>() .filter(|v| !v.is_empty()) .map(|v| v.join("\n ")); From 51585a129892f42eb23b0b37fea0e729f6678994 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Mon, 27 Apr 2020 20:37:21 +1200 Subject: [PATCH 0014/4780] Removed unused lifetimes and a needless bool --- clippy_lints/src/loops.rs | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 7cf3e16be..5f7f08979 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -775,10 +775,9 @@ fn same_var<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &Expr<'_>, var: HirId) - if let QPath::Resolved(None, path) = qpath; if path.segments.len() == 1; if let Res::Local(local_id) = qpath_res(cx, qpath, expr.hir_id); - // our variable! - if local_id == var; then { - true + // our variable! + local_id == var } else { false } @@ -870,10 +869,8 @@ fn get_offset<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, idx: &Expr<'_>, var: HirId) } } -fn get_assignments<'a, 'tcx>( - body: &'tcx Expr<'tcx>, -) -> impl Iterator, &'tcx Expr<'tcx>)>> { - fn get_assignment<'a, 'tcx>(e: &'tcx Expr<'tcx>) -> Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)> { +fn get_assignments<'tcx>(body: &'tcx Expr<'tcx>) -> impl Iterator, &'tcx Expr<'tcx>)>> { + fn get_assignment<'tcx>(e: &'tcx Expr<'tcx>) -> Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)> { if let ExprKind::Assign(lhs, rhs, _) = e.kind { Some((lhs, rhs)) } else { From 1afb6e6e3b23bd5555f34cc4dcd20349dfd789de Mon Sep 17 00:00:00 2001 From: Stanislav Tkach Date: Tue, 28 Apr 2020 12:08:38 +0300 Subject: [PATCH 0015/4780] Extend example for the `unneeded_field_pattern` lint Current example is incorrect (or pseudo-code) because a struct name is omitted. I have used the code from the tests instead. Perhaps this example can be made less verbose, but I think it is more convenient to see a "real" code as an example. --- clippy_lints/src/misc_early.rs | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/clippy_lints/src/misc_early.rs b/clippy_lints/src/misc_early.rs index adfd8dfb1..62ee05162 100644 --- a/clippy_lints/src/misc_early.rs +++ b/clippy_lints/src/misc_early.rs @@ -24,8 +24,25 @@ declare_clippy_lint! { /// **Known problems:** None. /// /// **Example:** - /// ```ignore - /// let { a: _, b: ref b, c: _ } = .. + /// ```rust + /// # struct Foo { + /// # a: i32, + /// # b: i32, + /// # c: i32, + /// # } + /// let f = Foo { a: 0, b: 0, c: 0 }; + /// + /// // Bad + /// match f { + /// Foo { a: _, b: 0, .. } => {}, + /// Foo { a: _, b: _, c: _ } => {}, + /// } + /// + /// // Good + /// match f { + /// Foo { b: 0, .. } => {}, + /// Foo { .. } => {}, + /// } /// ``` pub UNNEEDED_FIELD_PATTERN, restriction, From 461f4a34660691675434a318ac4fd61a83444428 Mon Sep 17 00:00:00 2001 From: rail <12975677+rail-rain@users.noreply.github.com> Date: Thu, 30 Apr 2020 17:32:37 +1200 Subject: [PATCH 0016/4780] Add missing tests --- tests/ui/manual_memcpy.rs | 10 ++++++++++ tests/ui/manual_memcpy.stderr | 16 ++++++++++++++-- 2 files changed, 24 insertions(+), 2 deletions(-) diff --git a/tests/ui/manual_memcpy.rs b/tests/ui/manual_memcpy.rs index 1f41838fa..9c24d6d4d 100644 --- a/tests/ui/manual_memcpy.rs +++ b/tests/ui/manual_memcpy.rs @@ -99,6 +99,16 @@ pub fn manual_copy(src: &[i32], dst: &mut [i32], dst2: &mut [i32]) { dst[i] = src[i - from]; } + #[allow(clippy::identity_op)] + for i in 0..5 { + dst[i - 0] = src[i]; + } + + #[allow(clippy::reverse_range_loop)] + for i in 0..0 { + dst[i] = src[i]; + } + // `RangeTo` `for` loop - don't trigger lint for i in 0.. { dst[i] = src[i]; diff --git a/tests/ui/manual_memcpy.stderr b/tests/ui/manual_memcpy.stderr index 95114c46f..bad84a589 100644 --- a/tests/ui/manual_memcpy.stderr +++ b/tests/ui/manual_memcpy.stderr @@ -67,10 +67,22 @@ LL | for i in from..from + 3 { | ^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[from..from + 3].clone_from_slice(&src[..(from + 3 - from)])` error: it looks like you're manually copying between slices - --> $DIR/manual_memcpy.rs:110:14 + --> $DIR/manual_memcpy.rs:103:14 + | +LL | for i in 0..5 { + | ^^^^ help: try replacing the loop by: `dst[..5].clone_from_slice(&src[..5])` + +error: it looks like you're manually copying between slices + --> $DIR/manual_memcpy.rs:108:14 + | +LL | for i in 0..0 { + | ^^^^ help: try replacing the loop by: `dst[..0].clone_from_slice(&src[..0])` + +error: it looks like you're manually copying between slices + --> $DIR/manual_memcpy.rs:120:14 | LL | for i in 0..src.len() { | ^^^^^^^^^^^^ help: try replacing the loop by: `dst[..src.len()].clone_from_slice(&src[..])` -error: aborting due to 11 previous errors +error: aborting due to 13 previous errors From f072ded3bf6286668ff8eade5b58e471dbe66f2a Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Fri, 1 May 2020 01:44:17 +0200 Subject: [PATCH 0017/4780] Implement the manual_non_exhaustive lint --- CHANGELOG.md | 1 + clippy_lints/src/lib.rs | 5 + clippy_lints/src/manual_non_exhaustive.rs | 167 ++++++++++++++++++++++ src/lintlist/mod.rs | 7 + tests/ui/manual_non_exhaustive.rs | 124 ++++++++++++++++ tests/ui/manual_non_exhaustive.stderr | 48 +++++++ 6 files changed, 352 insertions(+) create mode 100644 clippy_lints/src/manual_non_exhaustive.rs create mode 100644 tests/ui/manual_non_exhaustive.rs create mode 100644 tests/ui/manual_non_exhaustive.stderr diff --git a/CHANGELOG.md b/CHANGELOG.md index 575773580..facf363e3 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1423,6 +1423,7 @@ Released 2018-09-13 [`macro_use_imports`]: https://rust-lang.github.io/rust-clippy/master/index.html#macro_use_imports [`main_recursion`]: https://rust-lang.github.io/rust-clippy/master/index.html#main_recursion [`manual_memcpy`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_memcpy +[`manual_non_exhaustive`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_non_exhaustive [`manual_saturating_arithmetic`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_saturating_arithmetic [`manual_swap`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_swap [`many_single_char_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#many_single_char_names diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index c995be5ed..64f3a8a0e 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -247,6 +247,7 @@ mod literal_representation; mod loops; mod macro_use; mod main_recursion; +mod manual_non_exhaustive; mod map_clone; mod map_unit_fn; mod match_on_vec_items; @@ -628,6 +629,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &loops::WHILE_LET_ON_ITERATOR, ¯o_use::MACRO_USE_IMPORTS, &main_recursion::MAIN_RECURSION, + &manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE, &map_clone::MAP_CLONE, &map_unit_fn::OPTION_MAP_UNIT_FN, &map_unit_fn::RESULT_MAP_UNIT_FN, @@ -1064,6 +1066,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box utils::internal_lints::CollapsibleCalls); store.register_late_pass(|| box if_let_mutex::IfLetMutex); store.register_late_pass(|| box match_on_vec_items::MatchOnVecItems); + store.register_early_pass(|| box manual_non_exhaustive::ManualNonExhaustive); store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![ LintId::of(&arithmetic::FLOAT_ARITHMETIC), @@ -1280,6 +1283,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::WHILE_LET_LOOP), LintId::of(&loops::WHILE_LET_ON_ITERATOR), LintId::of(&main_recursion::MAIN_RECURSION), + LintId::of(&manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE), LintId::of(&map_clone::MAP_CLONE), LintId::of(&map_unit_fn::OPTION_MAP_UNIT_FN), LintId::of(&map_unit_fn::RESULT_MAP_UNIT_FN), @@ -1474,6 +1478,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::NEEDLESS_RANGE_LOOP), LintId::of(&loops::WHILE_LET_ON_ITERATOR), LintId::of(&main_recursion::MAIN_RECURSION), + LintId::of(&manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE), LintId::of(&map_clone::MAP_CLONE), LintId::of(&matches::INFALLIBLE_DESTRUCTURING_MATCH), LintId::of(&matches::MATCH_OVERLAPPING_ARM), diff --git a/clippy_lints/src/manual_non_exhaustive.rs b/clippy_lints/src/manual_non_exhaustive.rs new file mode 100644 index 000000000..ca2a2cf2e --- /dev/null +++ b/clippy_lints/src/manual_non_exhaustive.rs @@ -0,0 +1,167 @@ +use crate::utils::{snippet_opt, span_lint_and_then}; +use if_chain::if_chain; +use rustc_ast::ast::{Attribute, Ident, Item, ItemKind, StructField, TyKind, Variant, VariantData, VisibilityKind}; +use rustc_attr as attr; +use rustc_errors::Applicability; +use rustc_lint::{EarlyContext, EarlyLintPass}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; + +declare_clippy_lint! { + /// **What it does:** Checks for manual implementations of the non-exhaustive pattern. + /// + /// **Why is this bad?** Using the #[non_exhaustive] attribute expresses better the intent + /// and allows possible optimizations when applied to enums. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// ```rust + /// struct S { + /// pub a: i32, + /// pub b: i32, + /// _c: (), + /// } + /// + /// enum E { + /// A, + /// B, + /// #[doc(hidden)] + /// _C, + /// } + /// + /// struct T(pub i32, pub i32, ()); + /// ``` + /// Use instead: + /// ```rust + /// #[non_exhaustive] + /// struct S { + /// pub a: i32, + /// pub b: i32, + /// } + /// + /// #[non_exhaustive] + /// enum E { + /// A, + /// B, + /// } + /// + /// #[non_exhaustive] + /// struct T(pub i32, pub i32); + /// ``` + pub MANUAL_NON_EXHAUSTIVE, + style, + "manual implementations of the non-exhaustive pattern can be simplified using #[non_exhaustive]" +} + +declare_lint_pass!(ManualNonExhaustive => [MANUAL_NON_EXHAUSTIVE]); + +impl EarlyLintPass for ManualNonExhaustive { + fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) { + match &item.kind { + ItemKind::Enum(def, _) => { + check_manual_non_exhaustive_enum(cx, item, &def.variants); + }, + ItemKind::Struct(variant_data, _) => { + if let VariantData::Unit(..) = variant_data { + return; + } + + check_manual_non_exhaustive_struct(cx, item, variant_data); + }, + _ => {}, + } + } +} + +fn check_manual_non_exhaustive_enum(cx: &EarlyContext<'_>, item: &Item, variants: &[Variant]) { + fn is_non_exhaustive_marker(variant: &Variant) -> bool { + matches!(variant.data, VariantData::Unit(_)) + && variant.ident.as_str().starts_with('_') + && variant.attrs.iter().any(|a| is_doc_hidden(a)) + } + + fn is_doc_hidden(attr: &Attribute) -> bool { + attr.check_name(sym!(doc)) + && match attr.meta_item_list() { + Some(l) => attr::list_contains_name(&l, sym!(hidden)), + None => false, + } + } + + if_chain! { + if !attr::contains_name(&item.attrs, sym!(non_exhaustive)); + let markers = variants.iter().filter(|v| is_non_exhaustive_marker(v)).count(); + if markers == 1 && variants.len() > markers; + if let Some(variant) = variants.last(); + if is_non_exhaustive_marker(variant); + then { + span_lint_and_then( + cx, + MANUAL_NON_EXHAUSTIVE, + item.span, + "this seems like a manual implementation of the non-exhaustive pattern", + |diag| { + let header_span = cx.sess.source_map().span_until_char(item.span, '{'); + + if let Some(snippet) = snippet_opt(cx, header_span) { + diag.span_suggestion( + item.span, + "add the attribute", + format!("#[non_exhaustive] {}", snippet), + Applicability::Unspecified, + ); + diag.span_help(variant.span, "and remove this variant"); + } + }); + } + } +} + +fn check_manual_non_exhaustive_struct(cx: &EarlyContext<'_>, item: &Item, data: &VariantData) { + fn is_private(field: &StructField) -> bool { + matches!(field.vis.node, VisibilityKind::Inherited) + } + + fn is_non_exhaustive_marker(name: &Option) -> bool { + name.map(|n| n.as_str().starts_with('_')).unwrap_or(true) + } + + let fields = data.fields(); + let private_fields = fields.iter().filter(|f| is_private(f)).count(); + let public_fields = fields.iter().filter(|f| f.vis.node.is_pub()).count(); + + if_chain! { + if !attr::contains_name(&item.attrs, sym!(non_exhaustive)); + if private_fields == 1 && public_fields >= private_fields && public_fields == fields.len() - 1; + if let Some(field) = fields.iter().find(|f| is_private(f)); + if is_non_exhaustive_marker(&field.ident); + if let TyKind::Tup(tup_fields) = &field.ty.kind; + if tup_fields.is_empty(); + then { + span_lint_and_then( + cx, + MANUAL_NON_EXHAUSTIVE, + item.span, + "this seems like a manual implementation of the non-exhaustive pattern", + |diag| { + let delimiter = match data { + VariantData::Struct(..) => '{', + VariantData::Tuple(..) => '(', + _ => unreachable!(), + }; + let header_span = cx.sess.source_map().span_until_char(item.span, delimiter); + + if let Some(snippet) = snippet_opt(cx, header_span) { + diag.span_suggestion( + item.span, + "add the attribute", + format!("#[non_exhaustive] {}", snippet), + Applicability::Unspecified, + ); + diag.span_help(field.span, "and remove this field"); + } + }); + } + } +} diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 72675c251..c5360002f 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1088,6 +1088,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "loops", }, + Lint { + name: "manual_non_exhaustive", + group: "style", + desc: "manual implementations of the non-exhaustive pattern can be simplified using #[non_exhaustive]", + deprecation: None, + module: "manual_non_exhaustive", + }, Lint { name: "manual_saturating_arithmetic", group: "style", diff --git a/tests/ui/manual_non_exhaustive.rs b/tests/ui/manual_non_exhaustive.rs new file mode 100644 index 000000000..9c239db6e --- /dev/null +++ b/tests/ui/manual_non_exhaustive.rs @@ -0,0 +1,124 @@ +#![warn(clippy::manual_non_exhaustive)] +#![allow(unused)] + +mod enums { + enum E { + A, + B, + #[doc(hidden)] + _C, + } + + // last variant does not have doc hidden attribute, should be ignored + enum NoDocHidden { + A, + B, + _C, + } + + // name of variant with doc hidden does not start with underscore, should be ignored + enum NoUnderscore { + A, + B, + #[doc(hidden)] + C, + } + + // variant with doc hidden is not unit, should be ignored + enum NotUnit { + A, + B, + #[doc(hidden)] + _C(bool), + } + + // variant with doc hidden is not the last one, should be ignored + enum NotLast { + A, + #[doc(hidden)] + _B, + C, + } + + // variant with doc hidden is the only one, should be ignored + enum OnlyMarker { + #[doc(hidden)] + _A, + } + + // variant with multiple non-exhaustive "markers", should be ignored + enum MultipleMarkers { + A, + #[doc(hidden)] + _B, + #[doc(hidden)] + _C, + } + + // already non_exhaustive, should be ignored + #[non_exhaustive] + enum NonExhaustive { + A, + B, + } +} + +mod structs { + struct S { + pub a: i32, + pub b: i32, + _c: (), + } + + // some other fields are private, should be ignored + struct PrivateFields { + a: i32, + pub b: i32, + _c: (), + } + + // private field name does not start with underscore, should be ignored + struct NoUnderscore { + pub a: i32, + pub b: i32, + c: (), + } + + // private field is not unit type, should be ignored + struct NotUnit { + pub a: i32, + pub b: i32, + _c: i32, + } + + // private field is the only field, should be ignored + struct OnlyMarker { + _a: (), + } + + // already non exhaustive, should be ignored + #[non_exhaustive] + struct NonExhaustive { + pub a: i32, + pub b: i32, + } +} + +mod tuple_structs { + struct T(pub i32, pub i32, ()); + + // some other fields are private, should be ignored + struct PrivateFields(pub i32, i32, ()); + + // private field is not unit type, should be ignored + struct NotUnit(pub i32, pub i32, i32); + + // private field is the only field, should be ignored + struct OnlyMarker(()); + + // already non exhaustive, should be ignored + #[non_exhaustive] + struct NonExhaustive(pub i32, pub i32); +} + +fn main() {} diff --git a/tests/ui/manual_non_exhaustive.stderr b/tests/ui/manual_non_exhaustive.stderr new file mode 100644 index 000000000..d6719bca0 --- /dev/null +++ b/tests/ui/manual_non_exhaustive.stderr @@ -0,0 +1,48 @@ +error: this seems like a manual implementation of the non-exhaustive pattern + --> $DIR/manual_non_exhaustive.rs:5:5 + | +LL | / enum E { +LL | | A, +LL | | B, +LL | | #[doc(hidden)] +LL | | _C, +LL | | } + | |_____^ help: add the attribute: `#[non_exhaustive] enum E` + | + = note: `-D clippy::manual-non-exhaustive` implied by `-D warnings` +help: and remove this variant + --> $DIR/manual_non_exhaustive.rs:9:9 + | +LL | _C, + | ^^ + +error: this seems like a manual implementation of the non-exhaustive pattern + --> $DIR/manual_non_exhaustive.rs:67:5 + | +LL | / struct S { +LL | | pub a: i32, +LL | | pub b: i32, +LL | | _c: (), +LL | | } + | |_____^ help: add the attribute: `#[non_exhaustive] struct S` + | +help: and remove this field + --> $DIR/manual_non_exhaustive.rs:70:9 + | +LL | _c: (), + | ^^^^^^ + +error: this seems like a manual implementation of the non-exhaustive pattern + --> $DIR/manual_non_exhaustive.rs:108:5 + | +LL | struct T(pub i32, pub i32, ()); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add the attribute: `#[non_exhaustive] struct T` + | +help: and remove this field + --> $DIR/manual_non_exhaustive.rs:108:32 + | +LL | struct T(pub i32, pub i32, ()); + | ^^ + +error: aborting due to 3 previous errors + From 42b0b4754c881101cefb0307c489d6159c19b2f3 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Fri, 1 May 2020 22:37:14 +0200 Subject: [PATCH 0018/4780] Apply suggestions from PR review --- clippy_lints/src/manual_non_exhaustive.rs | 84 ++++++++++++----------- tests/ui/manual_non_exhaustive.rs | 39 +++++++---- tests/ui/manual_non_exhaustive.stderr | 81 ++++++++++++++++++---- 3 files changed, 139 insertions(+), 65 deletions(-) diff --git a/clippy_lints/src/manual_non_exhaustive.rs b/clippy_lints/src/manual_non_exhaustive.rs index ca2a2cf2e..a4273da1d 100644 --- a/clippy_lints/src/manual_non_exhaustive.rs +++ b/clippy_lints/src/manual_non_exhaustive.rs @@ -1,10 +1,11 @@ use crate::utils::{snippet_opt, span_lint_and_then}; use if_chain::if_chain; -use rustc_ast::ast::{Attribute, Ident, Item, ItemKind, StructField, TyKind, Variant, VariantData, VisibilityKind}; +use rustc_ast::ast::{Attribute, Item, ItemKind, StructField, Variant, VariantData, VisibilityKind}; use rustc_attr as attr; use rustc_errors::Applicability; use rustc_lint::{EarlyContext, EarlyLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_span::Span; declare_clippy_lint! { /// **What it does:** Checks for manual implementations of the non-exhaustive pattern. @@ -90,11 +91,9 @@ fn check_manual_non_exhaustive_enum(cx: &EarlyContext<'_>, item: &Item, variants } if_chain! { - if !attr::contains_name(&item.attrs, sym!(non_exhaustive)); - let markers = variants.iter().filter(|v| is_non_exhaustive_marker(v)).count(); - if markers == 1 && variants.len() > markers; - if let Some(variant) = variants.last(); - if is_non_exhaustive_marker(variant); + let mut markers = variants.iter().filter(|v| is_non_exhaustive_marker(v)); + if let Some(marker) = markers.next(); + if markers.count() == 0 && variants.len() > 1; then { span_lint_and_then( cx, @@ -102,17 +101,20 @@ fn check_manual_non_exhaustive_enum(cx: &EarlyContext<'_>, item: &Item, variants item.span, "this seems like a manual implementation of the non-exhaustive pattern", |diag| { - let header_span = cx.sess.source_map().span_until_char(item.span, '{'); - - if let Some(snippet) = snippet_opt(cx, header_span) { - diag.span_suggestion( - item.span, - "add the attribute", - format!("#[non_exhaustive] {}", snippet), - Applicability::Unspecified, - ); - diag.span_help(variant.span, "and remove this variant"); + if_chain! { + if !attr::contains_name(&item.attrs, sym!(non_exhaustive)); + let header_span = cx.sess.source_map().span_until_char(item.span, '{'); + if let Some(snippet) = snippet_opt(cx, header_span); + then { + diag.span_suggestion( + header_span, + "add the attribute", + format!("#[non_exhaustive] {}", snippet), + Applicability::Unspecified, + ); + } } + diag.span_help(marker.span, "remove this variant"); }); } } @@ -123,8 +125,18 @@ fn check_manual_non_exhaustive_struct(cx: &EarlyContext<'_>, item: &Item, data: matches!(field.vis.node, VisibilityKind::Inherited) } - fn is_non_exhaustive_marker(name: &Option) -> bool { - name.map(|n| n.as_str().starts_with('_')).unwrap_or(true) + fn is_non_exhaustive_marker(field: &StructField) -> bool { + is_private(field) && field.ty.kind.is_unit() && field.ident.map_or(true, |n| n.as_str().starts_with('_')) + } + + fn find_header_span(cx: &EarlyContext<'_>, item: &Item, data: &VariantData) -> Span { + let delimiter = match data { + VariantData::Struct(..) => '{', + VariantData::Tuple(..) => '(', + _ => unreachable!("`VariantData::Unit` is already handled above"), + }; + + cx.sess.source_map().span_until_char(item.span, delimiter) } let fields = data.fields(); @@ -132,12 +144,8 @@ fn check_manual_non_exhaustive_struct(cx: &EarlyContext<'_>, item: &Item, data: let public_fields = fields.iter().filter(|f| f.vis.node.is_pub()).count(); if_chain! { - if !attr::contains_name(&item.attrs, sym!(non_exhaustive)); - if private_fields == 1 && public_fields >= private_fields && public_fields == fields.len() - 1; - if let Some(field) = fields.iter().find(|f| is_private(f)); - if is_non_exhaustive_marker(&field.ident); - if let TyKind::Tup(tup_fields) = &field.ty.kind; - if tup_fields.is_empty(); + if private_fields == 1 && public_fields >= 1 && public_fields == fields.len() - 1; + if let Some(marker) = fields.iter().find(|f| is_non_exhaustive_marker(f)); then { span_lint_and_then( cx, @@ -145,22 +153,20 @@ fn check_manual_non_exhaustive_struct(cx: &EarlyContext<'_>, item: &Item, data: item.span, "this seems like a manual implementation of the non-exhaustive pattern", |diag| { - let delimiter = match data { - VariantData::Struct(..) => '{', - VariantData::Tuple(..) => '(', - _ => unreachable!(), - }; - let header_span = cx.sess.source_map().span_until_char(item.span, delimiter); - - if let Some(snippet) = snippet_opt(cx, header_span) { - diag.span_suggestion( - item.span, - "add the attribute", - format!("#[non_exhaustive] {}", snippet), - Applicability::Unspecified, - ); - diag.span_help(field.span, "and remove this field"); + if_chain! { + if !attr::contains_name(&item.attrs, sym!(non_exhaustive)); + let header_span = find_header_span(cx, item, data); + if let Some(snippet) = snippet_opt(cx, header_span); + then { + diag.span_suggestion( + header_span, + "add the attribute", + format!("#[non_exhaustive] {}", snippet), + Applicability::Unspecified, + ); + } } + diag.span_help(marker.span, "remove this field"); }); } } diff --git a/tests/ui/manual_non_exhaustive.rs b/tests/ui/manual_non_exhaustive.rs index 9c239db6e..7a788f485 100644 --- a/tests/ui/manual_non_exhaustive.rs +++ b/tests/ui/manual_non_exhaustive.rs @@ -9,7 +9,16 @@ mod enums { _C, } - // last variant does not have doc hidden attribute, should be ignored + // user forgot to remove the marker + #[non_exhaustive] + enum Ep { + A, + B, + #[doc(hidden)] + _C, + } + + // marker variant does not have doc hidden attribute, should be ignored enum NoDocHidden { A, B, @@ -32,21 +41,13 @@ mod enums { _C(bool), } - // variant with doc hidden is not the last one, should be ignored - enum NotLast { - A, - #[doc(hidden)] - _B, - C, - } - // variant with doc hidden is the only one, should be ignored enum OnlyMarker { #[doc(hidden)] _A, } - // variant with multiple non-exhaustive "markers", should be ignored + // variant with multiple markers, should be ignored enum MultipleMarkers { A, #[doc(hidden)] @@ -55,7 +56,7 @@ mod enums { _C, } - // already non_exhaustive, should be ignored + // already non_exhaustive and no markers, should be ignored #[non_exhaustive] enum NonExhaustive { A, @@ -70,6 +71,14 @@ mod structs { _c: (), } + // user forgot to remove the private field + #[non_exhaustive] + struct Sp { + pub a: i32, + pub b: i32, + _c: (), + } + // some other fields are private, should be ignored struct PrivateFields { a: i32, @@ -96,7 +105,7 @@ mod structs { _a: (), } - // already non exhaustive, should be ignored + // already non exhaustive and no private fields, should be ignored #[non_exhaustive] struct NonExhaustive { pub a: i32, @@ -107,6 +116,10 @@ mod structs { mod tuple_structs { struct T(pub i32, pub i32, ()); + // user forgot to remove the private field + #[non_exhaustive] + struct Tp(pub i32, pub i32, ()); + // some other fields are private, should be ignored struct PrivateFields(pub i32, i32, ()); @@ -116,7 +129,7 @@ mod tuple_structs { // private field is the only field, should be ignored struct OnlyMarker(()); - // already non exhaustive, should be ignored + // already non exhaustive and no private fields, should be ignored #[non_exhaustive] struct NonExhaustive(pub i32, pub i32); } diff --git a/tests/ui/manual_non_exhaustive.stderr b/tests/ui/manual_non_exhaustive.stderr index d6719bca0..613c5e8ca 100644 --- a/tests/ui/manual_non_exhaustive.stderr +++ b/tests/ui/manual_non_exhaustive.stderr @@ -1,48 +1,103 @@ error: this seems like a manual implementation of the non-exhaustive pattern --> $DIR/manual_non_exhaustive.rs:5:5 | -LL | / enum E { +LL | enum E { + | ^----- + | | + | _____help: add the attribute: `#[non_exhaustive] enum E` + | | LL | | A, LL | | B, LL | | #[doc(hidden)] LL | | _C, LL | | } - | |_____^ help: add the attribute: `#[non_exhaustive] enum E` + | |_____^ | = note: `-D clippy::manual-non-exhaustive` implied by `-D warnings` -help: and remove this variant +help: remove this variant --> $DIR/manual_non_exhaustive.rs:9:9 | LL | _C, | ^^ error: this seems like a manual implementation of the non-exhaustive pattern - --> $DIR/manual_non_exhaustive.rs:67:5 + --> $DIR/manual_non_exhaustive.rs:14:5 | -LL | / struct S { +LL | / enum Ep { +LL | | A, +LL | | B, +LL | | #[doc(hidden)] +LL | | _C, +LL | | } + | |_____^ + | +help: remove this variant + --> $DIR/manual_non_exhaustive.rs:18:9 + | +LL | _C, + | ^^ + +error: this seems like a manual implementation of the non-exhaustive pattern + --> $DIR/manual_non_exhaustive.rs:68:5 + | +LL | struct S { + | ^------- + | | + | _____help: add the attribute: `#[non_exhaustive] struct S` + | | LL | | pub a: i32, LL | | pub b: i32, LL | | _c: (), LL | | } - | |_____^ help: add the attribute: `#[non_exhaustive] struct S` + | |_____^ | -help: and remove this field - --> $DIR/manual_non_exhaustive.rs:70:9 +help: remove this field + --> $DIR/manual_non_exhaustive.rs:71:9 | LL | _c: (), | ^^^^^^ error: this seems like a manual implementation of the non-exhaustive pattern - --> $DIR/manual_non_exhaustive.rs:108:5 + --> $DIR/manual_non_exhaustive.rs:76:5 + | +LL | / struct Sp { +LL | | pub a: i32, +LL | | pub b: i32, +LL | | _c: (), +LL | | } + | |_____^ + | +help: remove this field + --> $DIR/manual_non_exhaustive.rs:79:9 + | +LL | _c: (), + | ^^^^^^ + +error: this seems like a manual implementation of the non-exhaustive pattern + --> $DIR/manual_non_exhaustive.rs:117:5 | LL | struct T(pub i32, pub i32, ()); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add the attribute: `#[non_exhaustive] struct T` + | --------^^^^^^^^^^^^^^^^^^^^^^^ + | | + | help: add the attribute: `#[non_exhaustive] struct T` | -help: and remove this field - --> $DIR/manual_non_exhaustive.rs:108:32 +help: remove this field + --> $DIR/manual_non_exhaustive.rs:117:32 | LL | struct T(pub i32, pub i32, ()); | ^^ -error: aborting due to 3 previous errors +error: this seems like a manual implementation of the non-exhaustive pattern + --> $DIR/manual_non_exhaustive.rs:121:5 + | +LL | struct Tp(pub i32, pub i32, ()); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: remove this field + --> $DIR/manual_non_exhaustive.rs:121:33 + | +LL | struct Tp(pub i32, pub i32, ()); + | ^^ + +error: aborting due to 6 previous errors From 10e3f9bdb854e3cabbc4fda69ed713388344d524 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Fri, 1 May 2020 23:02:31 +0200 Subject: [PATCH 0019/4780] Move match_on_vec_items to pedantic --- clippy_lints/src/lib.rs | 3 +-- clippy_lints/src/match_on_vec_items.rs | 2 +- src/lintlist/mod.rs | 2 +- 3 files changed, 3 insertions(+), 4 deletions(-) diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index c995be5ed..06e21a527 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -1138,6 +1138,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::EXPLICIT_INTO_ITER_LOOP), LintId::of(&loops::EXPLICIT_ITER_LOOP), LintId::of(¯o_use::MACRO_USE_IMPORTS), + LintId::of(&match_on_vec_items::MATCH_ON_VEC_ITEMS), LintId::of(&matches::MATCH_BOOL), LintId::of(&matches::SINGLE_MATCH_ELSE), LintId::of(&methods::FILTER_MAP), @@ -1283,7 +1284,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&map_clone::MAP_CLONE), LintId::of(&map_unit_fn::OPTION_MAP_UNIT_FN), LintId::of(&map_unit_fn::RESULT_MAP_UNIT_FN), - LintId::of(&match_on_vec_items::MATCH_ON_VEC_ITEMS), LintId::of(&matches::INFALLIBLE_DESTRUCTURING_MATCH), LintId::of(&matches::MATCH_AS_REF), LintId::of(&matches::MATCH_OVERLAPPING_ARM), @@ -1647,7 +1647,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::NEVER_LOOP), LintId::of(&loops::REVERSE_RANGE_LOOP), LintId::of(&loops::WHILE_IMMUTABLE_CONDITION), - LintId::of(&match_on_vec_items::MATCH_ON_VEC_ITEMS), LintId::of(&mem_discriminant::MEM_DISCRIMINANT_NON_ENUM), LintId::of(&mem_replace::MEM_REPLACE_WITH_UNINIT), LintId::of(&methods::CLONE_DOUBLE_REF), diff --git a/clippy_lints/src/match_on_vec_items.rs b/clippy_lints/src/match_on_vec_items.rs index 4071406cc..421571d2f 100644 --- a/clippy_lints/src/match_on_vec_items.rs +++ b/clippy_lints/src/match_on_vec_items.rs @@ -38,7 +38,7 @@ declare_clippy_lint! { /// } /// ``` pub MATCH_ON_VEC_ITEMS, - correctness, + pedantic, "matching on vector elements can panic" } diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 72675c251..f337db72b 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1146,7 +1146,7 @@ pub static ref ALL_LINTS: Vec = vec![ }, Lint { name: "match_on_vec_items", - group: "correctness", + group: "pedantic", desc: "matching on vector elements can panic", deprecation: None, module: "match_on_vec_items", From 350c17de24c0bc7ee1b17981fe02f88ca6ec50a4 Mon Sep 17 00:00:00 2001 From: ebroto Date: Fri, 1 May 2020 23:00:16 +0200 Subject: [PATCH 0020/4780] Use the only variant left instead of a wildcard Co-authored-by: Philipp Krones --- clippy_lints/src/manual_non_exhaustive.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/clippy_lints/src/manual_non_exhaustive.rs b/clippy_lints/src/manual_non_exhaustive.rs index a4273da1d..f3b8902e2 100644 --- a/clippy_lints/src/manual_non_exhaustive.rs +++ b/clippy_lints/src/manual_non_exhaustive.rs @@ -133,7 +133,7 @@ fn check_manual_non_exhaustive_struct(cx: &EarlyContext<'_>, item: &Item, data: let delimiter = match data { VariantData::Struct(..) => '{', VariantData::Tuple(..) => '(', - _ => unreachable!("`VariantData::Unit` is already handled above"), + VariantData::Unit(_) => unreachable!("`VariantData::Unit` is already handled above"), }; cx.sess.source_map().span_until_char(item.span, delimiter) From 72ce6d5be9c54775b847bc0641f8d909b2977126 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Fri, 24 Apr 2020 16:46:56 +0200 Subject: [PATCH 0021/4780] Fix unwrap lint when checks are done in parameters --- clippy_lints/src/unwrap.rs | 21 ++++++++++----- .../ui/checked_unwrap/simple_conditionals.rs | 27 +++++++++++++++++++ .../checked_unwrap/simple_conditionals.stderr | 24 ++++++++--------- 3 files changed, 54 insertions(+), 18 deletions(-) diff --git a/clippy_lints/src/unwrap.rs b/clippy_lints/src/unwrap.rs index 5235c98ef..f3844c7d3 100644 --- a/clippy_lints/src/unwrap.rs +++ b/clippy_lints/src/unwrap.rs @@ -1,4 +1,7 @@ -use crate::utils::{higher::if_block, is_type_diagnostic_item, span_lint_and_then, usage::is_potentially_mutated}; +use crate::utils::{ + differing_macro_contexts, higher::if_block, is_type_diagnostic_item, span_lint_and_then, + usage::is_potentially_mutated, +}; use if_chain::if_chain; use rustc_hir::intravisit::{walk_expr, walk_fn, FnKind, NestedVisitorMap, Visitor}; use rustc_hir::{BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, Path, QPath, UnOp}; @@ -73,6 +76,8 @@ struct UnwrapInfo<'tcx> { ident: &'tcx Path<'tcx>, /// The check, like `x.is_ok()` check: &'tcx Expr<'tcx>, + /// The branch where the check takes place, like `if x.is_ok() { .. }` + branch: &'tcx Expr<'tcx>, /// Whether `is_some()` or `is_ok()` was called (as opposed to `is_err()` or `is_none()`). safe_to_unwrap: bool, } @@ -82,19 +87,20 @@ struct UnwrapInfo<'tcx> { fn collect_unwrap_info<'a, 'tcx>( cx: &'a LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>, + branch: &'tcx Expr<'_>, invert: bool, ) -> Vec> { if let ExprKind::Binary(op, left, right) = &expr.kind { match (invert, op.node) { (false, BinOpKind::And) | (false, BinOpKind::BitAnd) | (true, BinOpKind::Or) | (true, BinOpKind::BitOr) => { - let mut unwrap_info = collect_unwrap_info(cx, left, invert); - unwrap_info.append(&mut collect_unwrap_info(cx, right, invert)); + let mut unwrap_info = collect_unwrap_info(cx, left, branch, invert); + unwrap_info.append(&mut collect_unwrap_info(cx, right, branch, invert)); return unwrap_info; }, _ => (), } } else if let ExprKind::Unary(UnOp::UnNot, expr) = &expr.kind { - return collect_unwrap_info(cx, expr, !invert); + return collect_unwrap_info(cx, expr, branch, !invert); } else { if_chain! { if let ExprKind::MethodCall(method_name, _, args) = &expr.kind; @@ -111,7 +117,7 @@ fn collect_unwrap_info<'a, 'tcx>( _ => unreachable!(), }; let safe_to_unwrap = unwrappable != invert; - return vec![UnwrapInfo { ident: path, check: expr, safe_to_unwrap }]; + return vec![UnwrapInfo { ident: path, check: expr, branch, safe_to_unwrap }]; } } } @@ -121,7 +127,7 @@ fn collect_unwrap_info<'a, 'tcx>( impl<'a, 'tcx> UnwrappableVariablesVisitor<'a, 'tcx> { fn visit_branch(&mut self, cond: &'tcx Expr<'_>, branch: &'tcx Expr<'_>, else_branch: bool) { let prev_len = self.unwrappables.len(); - for unwrap_info in collect_unwrap_info(self.cx, cond, else_branch) { + for unwrap_info in collect_unwrap_info(self.cx, cond, branch, else_branch) { if is_potentially_mutated(unwrap_info.ident, cond, self.cx) || is_potentially_mutated(unwrap_info.ident, branch, self.cx) { @@ -158,6 +164,9 @@ impl<'a, 'tcx> Visitor<'tcx> for UnwrappableVariablesVisitor<'a, 'tcx> { let call_to_unwrap = method_name.ident.name == sym!(unwrap); if let Some(unwrappable) = self.unwrappables.iter() .find(|u| u.ident.res == path.res); + // Span contexts should not differ with the conditional branch + if !differing_macro_contexts(unwrappable.branch.span, expr.span); + if !differing_macro_contexts(unwrappable.branch.span, unwrappable.check.span); then { if call_to_unwrap == unwrappable.safe_to_unwrap { span_lint_and_then( diff --git a/tests/ui/checked_unwrap/simple_conditionals.rs b/tests/ui/checked_unwrap/simple_conditionals.rs index b0fc26ff7..3e7b4b390 100644 --- a/tests/ui/checked_unwrap/simple_conditionals.rs +++ b/tests/ui/checked_unwrap/simple_conditionals.rs @@ -9,6 +9,30 @@ macro_rules! m { }; } +macro_rules! checks_in_param { + ($a:expr, $b:expr) => { + if $a { + $b; + } + }; +} + +macro_rules! checks_unwrap { + ($a:expr, $b:expr) => { + if $a.is_some() { + $b; + } + }; +} + +macro_rules! checks_some { + ($a:expr, $b:expr) => { + if $a { + $b.unwrap(); + } + }; +} + fn main() { let x = Some(()); if x.is_some() { @@ -22,6 +46,9 @@ fn main() { x.unwrap(); // unnecessary } m!(x); + checks_in_param!(x.is_some(), x.unwrap()); // ok + checks_unwrap!(x, x.unwrap()); // ok + checks_some!(x.is_some(), x); // ok let mut x: Result<(), ()> = Ok(()); if x.is_ok() { x.unwrap(); // unnecessary diff --git a/tests/ui/checked_unwrap/simple_conditionals.stderr b/tests/ui/checked_unwrap/simple_conditionals.stderr index e40542e2e..4013d1ed6 100644 --- a/tests/ui/checked_unwrap/simple_conditionals.stderr +++ b/tests/ui/checked_unwrap/simple_conditionals.stderr @@ -1,5 +1,5 @@ error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. - --> $DIR/simple_conditionals.rs:15:9 + --> $DIR/simple_conditionals.rs:39:9 | LL | if x.is_some() { | ----------- the check is happening here @@ -13,7 +13,7 @@ LL | #![deny(clippy::panicking_unwrap, clippy::unnecessary_unwrap)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ error: This call to `unwrap()` will always panic. - --> $DIR/simple_conditionals.rs:17:9 + --> $DIR/simple_conditionals.rs:41:9 | LL | if x.is_some() { | ----------- because of this check @@ -28,7 +28,7 @@ LL | #![deny(clippy::panicking_unwrap, clippy::unnecessary_unwrap)] | ^^^^^^^^^^^^^^^^^^^^^^^^ error: This call to `unwrap()` will always panic. - --> $DIR/simple_conditionals.rs:20:9 + --> $DIR/simple_conditionals.rs:44:9 | LL | if x.is_none() { | ----------- because of this check @@ -36,7 +36,7 @@ LL | x.unwrap(); // will panic | ^^^^^^^^^^ error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. - --> $DIR/simple_conditionals.rs:22:9 + --> $DIR/simple_conditionals.rs:46:9 | LL | if x.is_none() { | ----------- the check is happening here @@ -58,7 +58,7 @@ LL | m!(x); = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info) error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. - --> $DIR/simple_conditionals.rs:27:9 + --> $DIR/simple_conditionals.rs:54:9 | LL | if x.is_ok() { | --------- the check is happening here @@ -66,7 +66,7 @@ LL | x.unwrap(); // unnecessary | ^^^^^^^^^^ error: This call to `unwrap_err()` will always panic. - --> $DIR/simple_conditionals.rs:28:9 + --> $DIR/simple_conditionals.rs:55:9 | LL | if x.is_ok() { | --------- because of this check @@ -75,7 +75,7 @@ LL | x.unwrap_err(); // will panic | ^^^^^^^^^^^^^^ error: This call to `unwrap()` will always panic. - --> $DIR/simple_conditionals.rs:30:9 + --> $DIR/simple_conditionals.rs:57:9 | LL | if x.is_ok() { | --------- because of this check @@ -84,7 +84,7 @@ LL | x.unwrap(); // will panic | ^^^^^^^^^^ error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. - --> $DIR/simple_conditionals.rs:31:9 + --> $DIR/simple_conditionals.rs:58:9 | LL | if x.is_ok() { | --------- the check is happening here @@ -93,7 +93,7 @@ LL | x.unwrap_err(); // unnecessary | ^^^^^^^^^^^^^^ error: This call to `unwrap()` will always panic. - --> $DIR/simple_conditionals.rs:34:9 + --> $DIR/simple_conditionals.rs:61:9 | LL | if x.is_err() { | ---------- because of this check @@ -101,7 +101,7 @@ LL | x.unwrap(); // will panic | ^^^^^^^^^^ error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. - --> $DIR/simple_conditionals.rs:35:9 + --> $DIR/simple_conditionals.rs:62:9 | LL | if x.is_err() { | ---------- the check is happening here @@ -110,7 +110,7 @@ LL | x.unwrap_err(); // unnecessary | ^^^^^^^^^^^^^^ error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. - --> $DIR/simple_conditionals.rs:37:9 + --> $DIR/simple_conditionals.rs:64:9 | LL | if x.is_err() { | ---------- the check is happening here @@ -119,7 +119,7 @@ LL | x.unwrap(); // unnecessary | ^^^^^^^^^^ error: This call to `unwrap_err()` will always panic. - --> $DIR/simple_conditionals.rs:38:9 + --> $DIR/simple_conditionals.rs:65:9 | LL | if x.is_err() { | ---------- because of this check From d0c1f8ada2306801f2a6ce193e1f9f75471dbb3c Mon Sep 17 00:00:00 2001 From: Aleksei Latyshev Date: Sat, 2 May 2020 14:18:27 +0300 Subject: [PATCH 0022/4780] fix fp on while-let-on-iterator - fix `is_refutable` for slice patterns - fix `is_refutable` for bindings - add some TODO-s for cases, which can not be fixed easily --- clippy_lints/src/utils/mod.rs | 34 ++++++++++------ tests/ui/while_let_on_iterator.fixed | 58 +++++++++++++++++++++++++++ tests/ui/while_let_on_iterator.rs | 58 +++++++++++++++++++++++++++ tests/ui/while_let_on_iterator.stderr | 28 ++++++++++--- 4 files changed, 160 insertions(+), 18 deletions(-) diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index 04b4b4237..1c7b40fa9 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -933,6 +933,7 @@ pub fn is_ctor_or_promotable_const_function(cx: &LateContext<'_, '_>, expr: &Exp } /// Returns `true` if a pattern is refutable. +// TODO: should be implemented using rustc/mir_build/hair machinery pub fn is_refutable(cx: &LateContext<'_, '_>, pat: &Pat<'_>) -> bool { fn is_enum_variant(cx: &LateContext<'_, '_>, qpath: &QPath<'_>, id: HirId) -> bool { matches!( @@ -946,27 +947,34 @@ pub fn is_refutable(cx: &LateContext<'_, '_>, pat: &Pat<'_>) -> bool { } match pat.kind { - PatKind::Binding(..) | PatKind::Wild => false, + PatKind::Wild => false, + PatKind::Binding(_, _, _, pat) => pat.map_or(false, |pat| is_refutable(cx, pat)), PatKind::Box(ref pat) | PatKind::Ref(ref pat, _) => is_refutable(cx, pat), PatKind::Lit(..) | PatKind::Range(..) => true, PatKind::Path(ref qpath) => is_enum_variant(cx, qpath, pat.hir_id), - PatKind::Or(ref pats) | PatKind::Tuple(ref pats, _) => are_refutable(cx, pats.iter().map(|pat| &**pat)), + PatKind::Or(ref pats) => { + // TODO: should be the honest check, that pats is exhaustive set + are_refutable(cx, pats.iter().map(|pat| &**pat)) + }, + PatKind::Tuple(ref pats, _) => are_refutable(cx, pats.iter().map(|pat| &**pat)), PatKind::Struct(ref qpath, ref fields, _) => { - if is_enum_variant(cx, qpath, pat.hir_id) { - true - } else { - are_refutable(cx, fields.iter().map(|field| &*field.pat)) - } + is_enum_variant(cx, qpath, pat.hir_id) || are_refutable(cx, fields.iter().map(|field| &*field.pat)) }, PatKind::TupleStruct(ref qpath, ref pats, _) => { - if is_enum_variant(cx, qpath, pat.hir_id) { - true - } else { - are_refutable(cx, pats.iter().map(|pat| &**pat)) - } + is_enum_variant(cx, qpath, pat.hir_id) || are_refutable(cx, pats.iter().map(|pat| &**pat)) }, PatKind::Slice(ref head, ref middle, ref tail) => { - are_refutable(cx, head.iter().chain(middle).chain(tail.iter()).map(|pat| &**pat)) + match &cx.tables.node_type(pat.hir_id).kind { + ty::Slice(..) => { + // [..] is the only irrefutable slice pattern. + !head.is_empty() || middle.is_none() || !tail.is_empty() + }, + ty::Array(..) => are_refutable(cx, head.iter().chain(middle).chain(tail.iter()).map(|pat| &**pat)), + _ => { + // unreachable!() + true + }, + } }, } } diff --git a/tests/ui/while_let_on_iterator.fixed b/tests/ui/while_let_on_iterator.fixed index f5fcabf63..e99c98ac7 100644 --- a/tests/ui/while_let_on_iterator.fixed +++ b/tests/ui/while_let_on_iterator.fixed @@ -2,6 +2,7 @@ #![warn(clippy::while_let_on_iterator)] #![allow(clippy::never_loop, unreachable_code, unused_mut)] +#![feature(or_patterns)] fn base() { let mut iter = 1..20; @@ -77,6 +78,62 @@ fn refutable() { // */ } +fn refutable2() { + // Issue 3780 + { + let v = vec![1, 2, 3]; + let mut it = v.windows(2); + while let Some([x, y]) = it.next() { + println!("x: {}", x); + println!("y: {}", y); + } + + let mut it = v.windows(2); + while let Some([x, ..]) = it.next() { + println!("x: {}", x); + } + + let mut it = v.windows(2); + while let Some([.., y]) = it.next() { + println!("y: {}", y); + } + + let mut it = v.windows(2); + for [..] in it {} + + let v = vec![[1], [2], [3]]; + let mut it = v.iter(); + while let Some([1]) = it.next() {} + + let mut it = v.iter(); + for [_x] in it {} + } + + // binding + { + let v = vec![1, 2, 3]; + let mut it = v.iter(); + while let Some(x @ 1) = it.next() { + println!("{}", x); + } + + let v = vec![[1], [2], [3]]; + let mut it = v.iter(); + for x @ [_] in it { + println!("{:?}", x); + } + } + + // false negative + { + let v = vec![1, 2, 3]; + let mut it = v.iter().map(Some); + while let Some(Some(_) | None) = it.next() { + println!("1"); + } + } +} + fn nested_loops() { let a = [42, 1337]; let mut y = a.iter(); @@ -152,6 +209,7 @@ fn issue1654() { fn main() { base(); refutable(); + refutable2(); nested_loops(); issue1121(); issue2965(); diff --git a/tests/ui/while_let_on_iterator.rs b/tests/ui/while_let_on_iterator.rs index 04dce8a02..ba1317242 100644 --- a/tests/ui/while_let_on_iterator.rs +++ b/tests/ui/while_let_on_iterator.rs @@ -2,6 +2,7 @@ #![warn(clippy::while_let_on_iterator)] #![allow(clippy::never_loop, unreachable_code, unused_mut)] +#![feature(or_patterns)] fn base() { let mut iter = 1..20; @@ -77,6 +78,62 @@ fn refutable() { // */ } +fn refutable2() { + // Issue 3780 + { + let v = vec![1, 2, 3]; + let mut it = v.windows(2); + while let Some([x, y]) = it.next() { + println!("x: {}", x); + println!("y: {}", y); + } + + let mut it = v.windows(2); + while let Some([x, ..]) = it.next() { + println!("x: {}", x); + } + + let mut it = v.windows(2); + while let Some([.., y]) = it.next() { + println!("y: {}", y); + } + + let mut it = v.windows(2); + while let Some([..]) = it.next() {} + + let v = vec![[1], [2], [3]]; + let mut it = v.iter(); + while let Some([1]) = it.next() {} + + let mut it = v.iter(); + while let Some([_x]) = it.next() {} + } + + // binding + { + let v = vec![1, 2, 3]; + let mut it = v.iter(); + while let Some(x @ 1) = it.next() { + println!("{}", x); + } + + let v = vec![[1], [2], [3]]; + let mut it = v.iter(); + while let Some(x @ [_]) = it.next() { + println!("{:?}", x); + } + } + + // false negative + { + let v = vec![1, 2, 3]; + let mut it = v.iter().map(Some); + while let Some(Some(_) | None) = it.next() { + println!("1"); + } + } +} + fn nested_loops() { let a = [42, 1337]; let mut y = a.iter(); @@ -152,6 +209,7 @@ fn issue1654() { fn main() { base(); refutable(); + refutable2(); nested_loops(); issue1121(); issue2965(); diff --git a/tests/ui/while_let_on_iterator.stderr b/tests/ui/while_let_on_iterator.stderr index 6de138d72..aa980d996 100644 --- a/tests/ui/while_let_on_iterator.stderr +++ b/tests/ui/while_let_on_iterator.stderr @@ -1,5 +1,5 @@ error: this loop could be written as a `for` loop - --> $DIR/while_let_on_iterator.rs:8:5 + --> $DIR/while_let_on_iterator.rs:9:5 | LL | while let Option::Some(x) = iter.next() { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in iter` @@ -7,22 +7,40 @@ LL | while let Option::Some(x) = iter.next() { = note: `-D clippy::while-let-on-iterator` implied by `-D warnings` error: this loop could be written as a `for` loop - --> $DIR/while_let_on_iterator.rs:13:5 + --> $DIR/while_let_on_iterator.rs:14:5 | LL | while let Some(x) = iter.next() { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x in iter` error: this loop could be written as a `for` loop - --> $DIR/while_let_on_iterator.rs:18:5 + --> $DIR/while_let_on_iterator.rs:19:5 | LL | while let Some(_) = iter.next() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for _ in iter` error: this loop could be written as a `for` loop - --> $DIR/while_let_on_iterator.rs:97:9 + --> $DIR/while_let_on_iterator.rs:102:9 + | +LL | while let Some([..]) = it.next() {} + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for [..] in it` + +error: this loop could be written as a `for` loop + --> $DIR/while_let_on_iterator.rs:109:9 + | +LL | while let Some([_x]) = it.next() {} + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for [_x] in it` + +error: this loop could be written as a `for` loop + --> $DIR/while_let_on_iterator.rs:122:9 + | +LL | while let Some(x @ [_]) = it.next() { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for x @ [_] in it` + +error: this loop could be written as a `for` loop + --> $DIR/while_let_on_iterator.rs:154:9 | LL | while let Some(_) = y.next() { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for _ in y` -error: aborting due to 4 previous errors +error: aborting due to 7 previous errors From e7138e06291d13163e8ab2a57fe2465451fac193 Mon Sep 17 00:00:00 2001 From: CrazyRoka Date: Sat, 2 May 2020 14:25:45 +0300 Subject: [PATCH 0023/4780] Fix match on vec items: match on vec[..] - Added new tests - Fixed false positive when matching on full range, which will never panic --- clippy_lints/src/match_on_vec_items.rs | 21 ++++++++++++++++----- tests/ui/match_on_vec_items.rs | 22 ++++++++++++++++++++++ 2 files changed, 38 insertions(+), 5 deletions(-) diff --git a/clippy_lints/src/match_on_vec_items.rs b/clippy_lints/src/match_on_vec_items.rs index 421571d2f..236362130 100644 --- a/clippy_lints/src/match_on_vec_items.rs +++ b/clippy_lints/src/match_on_vec_items.rs @@ -1,4 +1,4 @@ -use crate::utils::{is_type_diagnostic_item, snippet, span_lint_and_sugg, walk_ptrs_ty}; +use crate::utils::{is_type_diagnostic_item, match_type, snippet, span_lint_and_sugg, walk_ptrs_ty}; use if_chain::if_chain; use rustc_errors::Applicability; use rustc_hir::{Expr, ExprKind, MatchSource}; @@ -75,10 +75,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MatchOnVecItems { fn is_vec_indexing<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'tcx>) -> Option<&'tcx Expr<'tcx>> { if_chain! { - if let ExprKind::Index(ref array, _) = expr.kind; - let ty = cx.tables.expr_ty(array); - let ty = walk_ptrs_ty(ty); - if is_type_diagnostic_item(cx, ty, sym!(vec_type)); + if let ExprKind::Index(ref array, ref index) = expr.kind; + if is_vector(cx, array); + if !is_full_range(cx, index); then { return Some(expr); @@ -87,3 +86,15 @@ fn is_vec_indexing<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'tcx>) None } + +fn is_vector(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { + let ty = cx.tables.expr_ty(expr); + let ty = walk_ptrs_ty(ty); + is_type_diagnostic_item(cx, ty, sym!(vec_type)) +} + +fn is_full_range(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { + let ty = cx.tables.expr_ty(expr); + let ty = walk_ptrs_ty(ty); + match_type(cx, ty, &["core", "ops", "range", "RangeFull"]) +} diff --git a/tests/ui/match_on_vec_items.rs b/tests/ui/match_on_vec_items.rs index 0bb39d77e..30415e3b9 100644 --- a/tests/ui/match_on_vec_items.rs +++ b/tests/ui/match_on_vec_items.rs @@ -120,6 +120,27 @@ fn match_with_array() { } } +fn match_with_endless_range() { + let arr = vec![0, 1, 2, 3]; + let range = ..; + + // Ok + match arr[range] { + [0, 1] => println!("0 1"), + [1, 2] => println!("1 2"), + [0, 1, 2, 3] => println!("0, 1, 2, 3"), + _ => {}, + } + + // Ok + match arr[..] { + [0, 1] => println!("0 1"), + [1, 2] => println!("1 2"), + [0, 1, 2, 3] => println!("0, 1, 2, 3"), + _ => {}, + } +} + fn main() { match_with_wildcard(); match_without_wildcard(); @@ -127,4 +148,5 @@ fn main() { match_vec_ref(); match_with_get(); match_with_array(); + match_with_endless_range(); } From de58c5644de0d9ffe46e7e2923d2301eaf4dd347 Mon Sep 17 00:00:00 2001 From: CrazyRoka Date: Sat, 2 May 2020 17:36:26 +0300 Subject: [PATCH 0024/4780] Changed RANGE_FULL constant in utils --- clippy_lints/src/match_on_vec_items.rs | 4 ++-- clippy_lints/src/utils/paths.rs | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/clippy_lints/src/match_on_vec_items.rs b/clippy_lints/src/match_on_vec_items.rs index 236362130..ee69628e9 100644 --- a/clippy_lints/src/match_on_vec_items.rs +++ b/clippy_lints/src/match_on_vec_items.rs @@ -1,4 +1,4 @@ -use crate::utils::{is_type_diagnostic_item, match_type, snippet, span_lint_and_sugg, walk_ptrs_ty}; +use crate::utils::{self, is_type_diagnostic_item, match_type, snippet, span_lint_and_sugg, walk_ptrs_ty}; use if_chain::if_chain; use rustc_errors::Applicability; use rustc_hir::{Expr, ExprKind, MatchSource}; @@ -96,5 +96,5 @@ fn is_vector(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { fn is_full_range(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { let ty = cx.tables.expr_ty(expr); let ty = walk_ptrs_ty(ty); - match_type(cx, ty, &["core", "ops", "range", "RangeFull"]) + match_type(cx, ty, &utils::paths::RANGE_FULL) } diff --git a/clippy_lints/src/utils/paths.rs b/clippy_lints/src/utils/paths.rs index ca2c4ade1..79ca6845c 100644 --- a/clippy_lints/src/utils/paths.rs +++ b/clippy_lints/src/utils/paths.rs @@ -85,7 +85,7 @@ pub const RANGE: [&str; 3] = ["core", "ops", "Range"]; pub const RANGE_ARGUMENT_TRAIT: [&str; 3] = ["core", "ops", "RangeBounds"]; pub const RANGE_FROM: [&str; 3] = ["core", "ops", "RangeFrom"]; pub const RANGE_FROM_STD: [&str; 3] = ["std", "ops", "RangeFrom"]; -pub const RANGE_FULL: [&str; 3] = ["core", "ops", "RangeFull"]; +pub const RANGE_FULL: [&str; 4] = ["core", "ops", "range", "RangeFull"]; pub const RANGE_FULL_STD: [&str; 3] = ["std", "ops", "RangeFull"]; pub const RANGE_INCLUSIVE_NEW: [&str; 4] = ["core", "ops", "RangeInclusive", "new"]; pub const RANGE_INCLUSIVE_STD_NEW: [&str; 4] = ["std", "ops", "RangeInclusive", "new"]; From 17d877cce28b22b9b345ec7ef8b14859d8b165c4 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Sun, 3 May 2020 15:59:57 +0200 Subject: [PATCH 0025/4780] Update contributing section about syncing Clippy --- CONTRIBUTING.md | 62 +++++++++++++++++++++---------------------------- 1 file changed, 26 insertions(+), 36 deletions(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 50a5ee8bb..079a51eae 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -155,47 +155,37 @@ That's why the `else_if_without_else` example uses the `register_early_pass` fun ## Fixing build failures caused by Rust -Clippy will sometimes fail to build from source because building it depends on unstable internal Rust features. Most of -the times we have to adapt to the changes and only very rarely there's an actual bug in Rust. Fixing build failures -caused by Rust updates, can be a good way to learn about Rust internals. +Clippy currently gets build with `rustc` of the `rust-lang/rust` `master` +branch. Most of the times we have to adapt to the changes and only very rarely +there's an actual bug in Rust. -In order to find out why Clippy does not work properly with a new Rust commit, you can use the [rust-toolstate commit -history][toolstate_commit_history]. You will then have to look for the last commit that contains -`test-pass -> build-fail` or `test-pass -> test-fail` for the `clippy-driver` component. -[Here][toolstate_commit] is an example. +If you decide to make Clippy work again with a Rust commit that breaks it, you +have to sync the `rust-lang/rust-clippy` repository with the `subtree` copy of +Clippy in the `rust-lang/rust` repository. -The commit message contains a link to the PR. The PRs are usually small enough to discover the breaking API change and -if they are bigger, they likely include some discussion that may help you to fix Clippy. +For general information about `subtree`s in the Rust repository see [Rust's +`CONTRIBUTING.md`][subtree]. -To check if Clippy is available for a specific target platform, you can check -the [rustup component history][rustup_component_history]. +Here is a TL;DR version of the sync process: -If you decide to make Clippy work again with a Rust commit that breaks it, -you probably want to install the latest Rust from master locally and run Clippy -using that version of Rust. +1. Clone the [`rust-lang/rust`] repository (all of the following commands have + to be run inside the `rust` directory) +2. Sync the changes to the copy of Clippy to your fork of the Clippy repository: + ```bash + # Make sure to change `your-github-name` to your github name in the following command + git subtree push -P src/tools/clippy git@github.com:your-github-name/rust-clippy sync-from-rust + ``` +3. Open a PR to `rust-lang/rust-clippy` and wait for it to get merged (to + accelerate the process ping the `@rust-lang/clippy` team in your PR and/or + ~~annoy~~ ask them in the [Discord] channel.) +4. Sync the `rust-lang/rust-clippy` master to the copy of Clippy: + ```bash + git checkout -b sync-from-clippy + git subtree pull -P src/tools/clippy https://github.com/rust-lang/rust-clippy master + ``` +5. Open a PR to [`rust-lang/rust`] -You can set up the master toolchain by running `./setup-toolchain.sh`. That script will install -[rustup-toolchain-install-master][rtim] and master toolchain, then run `rustup override set master`. - -After fixing the build failure on this repository, we can submit a pull request -to [`rust-lang/rust`] to fix the toolstate. - -To submit a pull request, you should follow these steps: - -```bash -# Assuming you already cloned the rust-lang/rust repo and you're in the correct directory -git submodule update --remote src/tools/clippy -cargo update -p clippy -git add -u -git commit -m "Update Clippy" -./x.py test -i --stage 1 src/tools/clippy # This is optional and should succeed anyway -# Open a PR in rust-lang/rust -``` - -[rustup_component_history]: https://rust-lang.github.io/rustup-components-history -[toolstate_commit_history]: https://github.com/rust-lang-nursery/rust-toolstate/commits/master -[toolstate_commit]: https://github.com/rust-lang-nursery/rust-toolstate/commit/aad74d8294e198a7cf8ac81a91aebb7f3bbcf727 -[rtim]: https://github.com/kennytm/rustup-toolchain-install-master +[subtree]: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#external-dependencies-subtree [`rust-lang/rust`]: https://github.com/rust-lang/rust ## Issue and PR triage From c1698fedeb69109f9b1aebc0bfccd9bf3112ccad Mon Sep 17 00:00:00 2001 From: Philipp Krones Date: Sun, 3 May 2020 16:47:57 +0200 Subject: [PATCH 0026/4780] Apply suggestions from code review Co-authored-by: Phil Hansch --- CONTRIBUTING.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 079a51eae..f7a609383 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -155,7 +155,7 @@ That's why the `else_if_without_else` example uses the `register_early_pass` fun ## Fixing build failures caused by Rust -Clippy currently gets build with `rustc` of the `rust-lang/rust` `master` +Clippy currently gets built with `rustc` of the `rust-lang/rust` `master` branch. Most of the times we have to adapt to the changes and only very rarely there's an actual bug in Rust. @@ -170,7 +170,7 @@ Here is a TL;DR version of the sync process: 1. Clone the [`rust-lang/rust`] repository (all of the following commands have to be run inside the `rust` directory) -2. Sync the changes to the copy of Clippy to your fork of the Clippy repository: +2. Sync the changes to the rust-copy of Clippy to your Clippy fork: ```bash # Make sure to change `your-github-name` to your github name in the following command git subtree push -P src/tools/clippy git@github.com:your-github-name/rust-clippy sync-from-rust @@ -178,7 +178,7 @@ Here is a TL;DR version of the sync process: 3. Open a PR to `rust-lang/rust-clippy` and wait for it to get merged (to accelerate the process ping the `@rust-lang/clippy` team in your PR and/or ~~annoy~~ ask them in the [Discord] channel.) -4. Sync the `rust-lang/rust-clippy` master to the copy of Clippy: +4. Sync the `rust-lang/rust-clippy` master to the rust-copy of Clippy: ```bash git checkout -b sync-from-clippy git subtree pull -P src/tools/clippy https://github.com/rust-lang/rust-clippy master From 7744cf4e53c4e19e5753e2063be420b9d0c0d38a Mon Sep 17 00:00:00 2001 From: Oliver Scherer Date: Mon, 4 May 2020 15:13:07 +0200 Subject: [PATCH 0027/4780] Update to rustc changes --- clippy_lints/src/redundant_clone.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/clippy_lints/src/redundant_clone.rs b/clippy_lints/src/redundant_clone.rs index d5cace0c6..d563eb886 100644 --- a/clippy_lints/src/redundant_clone.rs +++ b/clippy_lints/src/redundant_clone.rs @@ -591,7 +591,7 @@ struct PossibleBorrowerMap<'a, 'tcx> { impl PossibleBorrowerMap<'_, '_> { /// Returns true if the set of borrowers of `borrowed` living at `at` matches with `borrowers`. fn only_borrowers(&mut self, borrowers: &[mir::Local], borrowed: mir::Local, at: mir::Location) -> bool { - self.maybe_live.seek_after(at); + self.maybe_live.seek_after_primary_effect(at); self.bitset.0.clear(); let maybe_live = &mut self.maybe_live; From 780a63a1ba84597eaf33e4d546bcf0edd6225836 Mon Sep 17 00:00:00 2001 From: Oliver Scherer Date: Tue, 5 May 2020 15:11:59 +0200 Subject: [PATCH 0028/4780] Update ui tests --- tests/ui/builtin-type-shadow.stderr | 2 -- 1 file changed, 2 deletions(-) diff --git a/tests/ui/builtin-type-shadow.stderr b/tests/ui/builtin-type-shadow.stderr index b6a4adde8..bc785b075 100644 --- a/tests/ui/builtin-type-shadow.stderr +++ b/tests/ui/builtin-type-shadow.stderr @@ -18,8 +18,6 @@ LL | 42 | = note: expected type parameter `u32` found type `{integer}` - = help: type parameters must be constrained to match other types - = note: for more information, visit https://doc.rust-lang.org/book/ch10-02-traits.html#traits-as-parameters error: aborting due to 2 previous errors From 3b58d66b22fe9107a78b99c267c71322276aa15a Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Thu, 7 May 2020 21:41:23 +0200 Subject: [PATCH 0029/4780] Add the manual_async_fn lint --- CHANGELOG.md | 1 + clippy_lints/src/lib.rs | 5 + clippy_lints/src/manual_async_fn.rs | 160 ++++++++++++++++++++++++++++ clippy_lints/src/utils/paths.rs | 3 + src/lintlist/mod.rs | 7 ++ tests/ui/future_not_send.rs | 1 + tests/ui/future_not_send.stderr | 6 +- tests/ui/manual_async_fn.fixed | 55 ++++++++++ tests/ui/manual_async_fn.rs | 67 ++++++++++++ tests/ui/manual_async_fn.stderr | 93 ++++++++++++++++ 10 files changed, 395 insertions(+), 3 deletions(-) create mode 100644 clippy_lints/src/manual_async_fn.rs create mode 100644 tests/ui/manual_async_fn.fixed create mode 100644 tests/ui/manual_async_fn.rs create mode 100644 tests/ui/manual_async_fn.stderr diff --git a/CHANGELOG.md b/CHANGELOG.md index facf363e3..8457d6ad0 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1422,6 +1422,7 @@ Released 2018-09-13 [`lossy_float_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#lossy_float_literal [`macro_use_imports`]: https://rust-lang.github.io/rust-clippy/master/index.html#macro_use_imports [`main_recursion`]: https://rust-lang.github.io/rust-clippy/master/index.html#main_recursion +[`manual_async_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_async_fn [`manual_memcpy`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_memcpy [`manual_non_exhaustive`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_non_exhaustive [`manual_saturating_arithmetic`]: https://rust-lang.github.io/rust-clippy/master/index.html#manual_saturating_arithmetic diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 97785cba8..fb2e9932b 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -247,6 +247,7 @@ mod literal_representation; mod loops; mod macro_use; mod main_recursion; +mod manual_async_fn; mod manual_non_exhaustive; mod map_clone; mod map_unit_fn; @@ -629,6 +630,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &loops::WHILE_LET_ON_ITERATOR, ¯o_use::MACRO_USE_IMPORTS, &main_recursion::MAIN_RECURSION, + &manual_async_fn::MANUAL_ASYNC_FN, &manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE, &map_clone::MAP_CLONE, &map_unit_fn::OPTION_MAP_UNIT_FN, @@ -1067,6 +1069,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box if_let_mutex::IfLetMutex); store.register_late_pass(|| box match_on_vec_items::MatchOnVecItems); store.register_early_pass(|| box manual_non_exhaustive::ManualNonExhaustive); + store.register_late_pass(|| box manual_async_fn::ManualAsyncFn); store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![ LintId::of(&arithmetic::FLOAT_ARITHMETIC), @@ -1284,6 +1287,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::WHILE_LET_LOOP), LintId::of(&loops::WHILE_LET_ON_ITERATOR), LintId::of(&main_recursion::MAIN_RECURSION), + LintId::of(&manual_async_fn::MANUAL_ASYNC_FN), LintId::of(&manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE), LintId::of(&map_clone::MAP_CLONE), LintId::of(&map_unit_fn::OPTION_MAP_UNIT_FN), @@ -1478,6 +1482,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::NEEDLESS_RANGE_LOOP), LintId::of(&loops::WHILE_LET_ON_ITERATOR), LintId::of(&main_recursion::MAIN_RECURSION), + LintId::of(&manual_async_fn::MANUAL_ASYNC_FN), LintId::of(&manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE), LintId::of(&map_clone::MAP_CLONE), LintId::of(&matches::INFALLIBLE_DESTRUCTURING_MATCH), diff --git a/clippy_lints/src/manual_async_fn.rs b/clippy_lints/src/manual_async_fn.rs new file mode 100644 index 000000000..ab8829abb --- /dev/null +++ b/clippy_lints/src/manual_async_fn.rs @@ -0,0 +1,160 @@ +use crate::utils::paths::{FUTURE_CORE, FUTURE_FROM_GENERATOR, FUTURE_STD}; +use crate::utils::{match_function_call, match_path, snippet_block, snippet_opt, span_lint_and_then}; +use if_chain::if_chain; +use rustc_errors::Applicability; +use rustc_hir::intravisit::FnKind; +use rustc_hir::{ + AsyncGeneratorKind, Block, Body, Expr, ExprKind, FnDecl, FnRetTy, GeneratorKind, GenericBound, HirId, IsAsync, + ItemKind, TraitRef, Ty, TyKind, TypeBindingKind, +}; +use rustc_lint::{LateContext, LateLintPass}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_span::Span; + +declare_clippy_lint! { + /// **What it does:** It checks for manual implementations of `async` functions. + /// + /// **Why is this bad?** It's more idiomatic to use the dedicated syntax. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// ```rust + /// use std::future::Future; + /// + /// fn foo() -> Future { async { 42 } } + /// ``` + /// Use instead: + /// ```rust + /// use std::future::Future; + /// + /// async fn foo() -> i32 { 42 } + /// ``` + pub MANUAL_ASYNC_FN, + style, + "manual implementations of `async` functions can be simplified using the dedicated syntax" +} + +declare_lint_pass!(ManualAsyncFn => [MANUAL_ASYNC_FN]); + +impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ManualAsyncFn { + fn check_fn( + &mut self, + cx: &LateContext<'a, 'tcx>, + kind: FnKind<'tcx>, + decl: &'tcx FnDecl<'_>, + body: &'tcx Body<'_>, + span: Span, + _: HirId, + ) { + if_chain! { + if let Some(header) = kind.header(); + if let IsAsync::NotAsync = header.asyncness; + // Check that this function returns `impl Future` + if let FnRetTy::Return(ret_ty) = decl.output; + if let Some(trait_ref) = future_trait_ref(cx, ret_ty); + if let Some(output) = future_output_ty(trait_ref); + // Check that the body of the function consists of one async block + if let ExprKind::Block(block, _) = body.value.kind; + if block.stmts.is_empty(); + if let Some(closure_body) = desugared_async_block(cx, block); + then { + let header_span = span.with_hi(ret_ty.span.hi()); + + span_lint_and_then( + cx, + MANUAL_ASYNC_FN, + header_span, + "this function can be simplified using async syntax", + |diag| { + if_chain! { + if let Some(header_snip) = snippet_opt(cx, header_span); + if let Some(ret_pos) = header_snip.rfind("->"); + if let Some((ret_sugg, ret_snip)) = suggested_ret(cx, output); + then { + let help = format!("make the function `async` and {}", ret_sugg); + diag.span_suggestion( + header_span, + &help, + format!("async {}{}", &header_snip[..ret_pos], ret_snip), + Applicability::MachineApplicable + ); + + let body_snip = snippet_block(cx, closure_body.value.span, "..", Some(block.span)); + diag.span_suggestion( + block.span, + "move the body of the async block to the enclosing function", + body_snip.to_string(), + Applicability::MachineApplicable + ); + } + } + }, + ); + } + } + } +} + +fn future_trait_ref<'tcx>(cx: &LateContext<'_, 'tcx>, ty: &'tcx Ty<'tcx>) -> Option<&'tcx TraitRef<'tcx>> { + if_chain! { + if let TyKind::Def(item_id, _) = ty.kind; + let item = cx.tcx.hir().item(item_id.id); + if let ItemKind::OpaqueTy(opaque) = &item.kind; + if opaque.bounds.len() == 1; + if let GenericBound::Trait(poly, _) = &opaque.bounds[0]; + let path = poly.trait_ref.path; + if match_path(&path, &FUTURE_CORE) || match_path(&path, &FUTURE_STD); + then { + return Some(&poly.trait_ref); + } + } + + None +} + +fn future_output_ty<'tcx>(trait_ref: &'tcx TraitRef<'tcx>) -> Option<&'tcx Ty<'tcx>> { + if_chain! { + if let Some(segment) = trait_ref.path.segments.last(); + if let Some(args) = segment.args; + if args.bindings.len() == 1; + let binding = &args.bindings[0]; + if binding.ident.as_str() == "Output"; + if let TypeBindingKind::Equality{ty: output} = binding.kind; + then { + return Some(output) + } + } + + None +} + +fn desugared_async_block<'tcx>(cx: &LateContext<'_, 'tcx>, block: &'tcx Block<'tcx>) -> Option<&'tcx Body<'tcx>> { + if_chain! { + if let Some(block_expr) = block.expr; + if let Some(args) = match_function_call(cx, block_expr, &FUTURE_FROM_GENERATOR); + if args.len() == 1; + if let Expr{kind: ExprKind::Closure(_, _, body_id, ..), ..} = args[0]; + let closure_body = cx.tcx.hir().body(body_id); + if let Some(GeneratorKind::Async(AsyncGeneratorKind::Block)) = closure_body.generator_kind; + then { + return Some(closure_body); + } + } + + None +} + +fn suggested_ret(cx: &LateContext<'_, '_>, output: &Ty<'_>) -> Option<(&'static str, String)> { + match output.kind { + TyKind::Tup(tys) if tys.is_empty() => { + let sugg = "remove the return type"; + Some((sugg, "".into())) + }, + _ => { + let sugg = "return the output of the future directly"; + snippet_opt(cx, output.span).map(|snip| (sugg, format!("-> {}", snip))) + }, + } +} diff --git a/clippy_lints/src/utils/paths.rs b/clippy_lints/src/utils/paths.rs index 79ca6845c..74040a96c 100644 --- a/clippy_lints/src/utils/paths.rs +++ b/clippy_lints/src/utils/paths.rs @@ -42,6 +42,9 @@ pub const FMT_ARGUMENTS_NEW_V1_FORMATTED: [&str; 4] = ["core", "fmt", "Arguments pub const FMT_ARGUMENTV1_NEW: [&str; 4] = ["core", "fmt", "ArgumentV1", "new"]; pub const FROM_FROM: [&str; 4] = ["core", "convert", "From", "from"]; pub const FROM_TRAIT: [&str; 3] = ["core", "convert", "From"]; +pub const FUTURE_CORE: [&str; 3] = ["core", "future", "Future"]; +pub const FUTURE_FROM_GENERATOR: [&str; 3] = ["core", "future", "from_generator"]; +pub const FUTURE_STD: [&str; 3] = ["std", "future", "Future"]; pub const HASH: [&str; 2] = ["hash", "Hash"]; pub const HASHMAP: [&str; 5] = ["std", "collections", "hash", "map", "HashMap"]; pub const HASHMAP_ENTRY: [&str; 5] = ["std", "collections", "hash", "map", "Entry"]; diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index a7685f672..51d1cb221 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1081,6 +1081,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "main_recursion", }, + Lint { + name: "manual_async_fn", + group: "style", + desc: "manual implementations of `async` functions can be simplified using the dedicated syntax", + deprecation: None, + module: "manual_async_fn", + }, Lint { name: "manual_memcpy", group: "perf", diff --git a/tests/ui/future_not_send.rs b/tests/ui/future_not_send.rs index 6d09d71a6..d3a920de4 100644 --- a/tests/ui/future_not_send.rs +++ b/tests/ui/future_not_send.rs @@ -41,6 +41,7 @@ impl Dummy { self.private_future().await; } + #[allow(clippy::manual_async_fn)] pub fn public_send(&self) -> impl std::future::Future { async { false } } diff --git a/tests/ui/future_not_send.stderr b/tests/ui/future_not_send.stderr index 3b4968ef0..d1863701b 100644 --- a/tests/ui/future_not_send.stderr +++ b/tests/ui/future_not_send.stderr @@ -96,13 +96,13 @@ LL | } = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Sync` error: future cannot be sent between threads safely - --> $DIR/future_not_send.rs:49:37 + --> $DIR/future_not_send.rs:50:37 | LL | async fn generic_future(t: T) -> T | ^ future returned by `generic_future` is not `Send` | note: future is not `Send` as this value is used across an await - --> $DIR/future_not_send.rs:54:5 + --> $DIR/future_not_send.rs:55:5 | LL | let rt = &t; | -- has type `&T` which is not `Send` @@ -114,7 +114,7 @@ LL | } = note: `T` doesn't implement `std::marker::Sync` error: future cannot be sent between threads safely - --> $DIR/future_not_send.rs:65:34 + --> $DIR/future_not_send.rs:66:34 | LL | async fn unclear_future(t: T) {} | ^ diff --git a/tests/ui/manual_async_fn.fixed b/tests/ui/manual_async_fn.fixed new file mode 100644 index 000000000..84c02bba4 --- /dev/null +++ b/tests/ui/manual_async_fn.fixed @@ -0,0 +1,55 @@ +// run-rustfix +// edition:2018 +#![warn(clippy::manual_async_fn)] +#![allow(unused)] + +use std::future::Future; + +async fn fut() -> i32 { 42 } + +async fn empty_fut() {} + +async fn core_fut() -> i32 { 42 } + +// should be ignored +fn has_other_stmts() -> impl core::future::Future { + let _ = 42; + async move { 42 } +} + +// should be ignored +fn not_fut() -> i32 { + 42 +} + +// should be ignored +async fn already_async() -> impl Future { + async { 42 } +} + +struct S {} +impl S { + async fn inh_fut() -> i32 { 42 } + + async fn meth_fut(&self) -> i32 { 42 } + + async fn empty_fut(&self) {} + + // should be ignored + fn not_fut(&self) -> i32 { + 42 + } + + // should be ignored + fn has_other_stmts() -> impl core::future::Future { + let _ = 42; + async move { 42 } + } + + // should be ignored + async fn already_async(&self) -> impl Future { + async { 42 } + } +} + +fn main() {} diff --git a/tests/ui/manual_async_fn.rs b/tests/ui/manual_async_fn.rs new file mode 100644 index 000000000..bd5f9d1cf --- /dev/null +++ b/tests/ui/manual_async_fn.rs @@ -0,0 +1,67 @@ +// run-rustfix +// edition:2018 +#![warn(clippy::manual_async_fn)] +#![allow(unused)] + +use std::future::Future; + +fn fut() -> impl Future { + async { 42 } +} + +fn empty_fut() -> impl Future { + async {} +} + +fn core_fut() -> impl core::future::Future { + async move { 42 } +} + +// should be ignored +fn has_other_stmts() -> impl core::future::Future { + let _ = 42; + async move { 42 } +} + +// should be ignored +fn not_fut() -> i32 { + 42 +} + +// should be ignored +async fn already_async() -> impl Future { + async { 42 } +} + +struct S {} +impl S { + fn inh_fut() -> impl Future { + async { 42 } + } + + fn meth_fut(&self) -> impl Future { + async { 42 } + } + + fn empty_fut(&self) -> impl Future { + async {} + } + + // should be ignored + fn not_fut(&self) -> i32 { + 42 + } + + // should be ignored + fn has_other_stmts() -> impl core::future::Future { + let _ = 42; + async move { 42 } + } + + // should be ignored + async fn already_async(&self) -> impl Future { + async { 42 } + } +} + +fn main() {} diff --git a/tests/ui/manual_async_fn.stderr b/tests/ui/manual_async_fn.stderr new file mode 100644 index 000000000..016fdf959 --- /dev/null +++ b/tests/ui/manual_async_fn.stderr @@ -0,0 +1,93 @@ +error: this function can be simplified using async syntax + --> $DIR/manual_async_fn.rs:8:1 + | +LL | fn fut() -> impl Future { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = note: `-D clippy::manual-async-fn` implied by `-D warnings` +help: make the function `async` and return the output of the future directly + | +LL | async fn fut() -> i32 { + | ^^^^^^^^^^^^^^^^^^^^^ +help: move the body of the async block to the enclosing function + | +LL | fn fut() -> impl Future { 42 } + | ^^^^^^ + +error: this function can be simplified using async syntax + --> $DIR/manual_async_fn.rs:12:1 + | +LL | fn empty_fut() -> impl Future { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: make the function `async` and remove the return type + | +LL | async fn empty_fut() { + | ^^^^^^^^^^^^^^^^^^^^ +help: move the body of the async block to the enclosing function + | +LL | fn empty_fut() -> impl Future {} + | ^^ + +error: this function can be simplified using async syntax + --> $DIR/manual_async_fn.rs:16:1 + | +LL | fn core_fut() -> impl core::future::Future { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: make the function `async` and return the output of the future directly + | +LL | async fn core_fut() -> i32 { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^ +help: move the body of the async block to the enclosing function + | +LL | fn core_fut() -> impl core::future::Future { 42 } + | ^^^^^^ + +error: this function can be simplified using async syntax + --> $DIR/manual_async_fn.rs:38:5 + | +LL | fn inh_fut() -> impl Future { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: make the function `async` and return the output of the future directly + | +LL | async fn inh_fut() -> i32 { + | ^^^^^^^^^^^^^^^^^^^^^^^^^ +help: move the body of the async block to the enclosing function + | +LL | fn inh_fut() -> impl Future { 42 } + | ^^^^^^ + +error: this function can be simplified using async syntax + --> $DIR/manual_async_fn.rs:42:5 + | +LL | fn meth_fut(&self) -> impl Future { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: make the function `async` and return the output of the future directly + | +LL | async fn meth_fut(&self) -> i32 { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +help: move the body of the async block to the enclosing function + | +LL | fn meth_fut(&self) -> impl Future { 42 } + | ^^^^^^ + +error: this function can be simplified using async syntax + --> $DIR/manual_async_fn.rs:46:5 + | +LL | fn empty_fut(&self) -> impl Future { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: make the function `async` and remove the return type + | +LL | async fn empty_fut(&self) { + | ^^^^^^^^^^^^^^^^^^^^^^^^^ +help: move the body of the async block to the enclosing function + | +LL | fn empty_fut(&self) -> impl Future {} + | ^^ + +error: aborting due to 6 previous errors + From 4ac348b30849ec472564a81797b7e9ae42985460 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Thu, 7 May 2020 22:03:38 +0200 Subject: [PATCH 0030/4780] Fix doc comment in lint declaration --- clippy_lints/src/manual_async_fn.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/clippy_lints/src/manual_async_fn.rs b/clippy_lints/src/manual_async_fn.rs index ab8829abb..b4be3ecfd 100644 --- a/clippy_lints/src/manual_async_fn.rs +++ b/clippy_lints/src/manual_async_fn.rs @@ -23,7 +23,7 @@ declare_clippy_lint! { /// ```rust /// use std::future::Future; /// - /// fn foo() -> Future { async { 42 } } + /// fn foo() -> impl Future { async { 42 } } /// ``` /// Use instead: /// ```rust From 3e4bc026e2706b1cb21bad6d55726f8b5a1d4cf1 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Thu, 7 May 2020 22:40:28 +0200 Subject: [PATCH 0031/4780] Apply suggestions from PR review --- clippy_lints/src/manual_async_fn.rs | 9 ++++----- clippy_lints/src/utils/paths.rs | 2 -- tests/ui/manual_async_fn.fixed | 14 +++++++++++++- tests/ui/manual_async_fn.rs | 14 +++++++++++++- tests/ui/manual_async_fn.stderr | 25 +++++++++++++++---------- 5 files changed, 45 insertions(+), 19 deletions(-) diff --git a/clippy_lints/src/manual_async_fn.rs b/clippy_lints/src/manual_async_fn.rs index b4be3ecfd..cb72a2405 100644 --- a/clippy_lints/src/manual_async_fn.rs +++ b/clippy_lints/src/manual_async_fn.rs @@ -1,5 +1,5 @@ -use crate::utils::paths::{FUTURE_CORE, FUTURE_FROM_GENERATOR, FUTURE_STD}; -use crate::utils::{match_function_call, match_path, snippet_block, snippet_opt, span_lint_and_then}; +use crate::utils::paths::FUTURE_FROM_GENERATOR; +use crate::utils::{match_function_call, snippet_block, snippet_opt, span_lint_and_then}; use if_chain::if_chain; use rustc_errors::Applicability; use rustc_hir::intravisit::FnKind; @@ -66,7 +66,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ManualAsyncFn { cx, MANUAL_ASYNC_FN, header_span, - "this function can be simplified using async syntax", + "this function can be simplified using the `async fn` syntax", |diag| { if_chain! { if let Some(header_snip) = snippet_opt(cx, header_span); @@ -104,8 +104,7 @@ fn future_trait_ref<'tcx>(cx: &LateContext<'_, 'tcx>, ty: &'tcx Ty<'tcx>) -> Opt if let ItemKind::OpaqueTy(opaque) = &item.kind; if opaque.bounds.len() == 1; if let GenericBound::Trait(poly, _) = &opaque.bounds[0]; - let path = poly.trait_ref.path; - if match_path(&path, &FUTURE_CORE) || match_path(&path, &FUTURE_STD); + if poly.trait_ref.trait_def_id() == cx.tcx.lang_items().future_trait(); then { return Some(&poly.trait_ref); } diff --git a/clippy_lints/src/utils/paths.rs b/clippy_lints/src/utils/paths.rs index 74040a96c..b3ad2ad9d 100644 --- a/clippy_lints/src/utils/paths.rs +++ b/clippy_lints/src/utils/paths.rs @@ -42,9 +42,7 @@ pub const FMT_ARGUMENTS_NEW_V1_FORMATTED: [&str; 4] = ["core", "fmt", "Arguments pub const FMT_ARGUMENTV1_NEW: [&str; 4] = ["core", "fmt", "ArgumentV1", "new"]; pub const FROM_FROM: [&str; 4] = ["core", "convert", "From", "from"]; pub const FROM_TRAIT: [&str; 3] = ["core", "convert", "From"]; -pub const FUTURE_CORE: [&str; 3] = ["core", "future", "Future"]; pub const FUTURE_FROM_GENERATOR: [&str; 3] = ["core", "future", "from_generator"]; -pub const FUTURE_STD: [&str; 3] = ["std", "future", "Future"]; pub const HASH: [&str; 2] = ["hash", "Hash"]; pub const HASHMAP: [&str; 5] = ["std", "collections", "hash", "map", "HashMap"]; pub const HASHMAP_ENTRY: [&str; 5] = ["std", "collections", "hash", "map", "Entry"]; diff --git a/tests/ui/manual_async_fn.fixed b/tests/ui/manual_async_fn.fixed index 84c02bba4..6bb1032a1 100644 --- a/tests/ui/manual_async_fn.fixed +++ b/tests/ui/manual_async_fn.fixed @@ -29,7 +29,19 @@ async fn already_async() -> impl Future { struct S {} impl S { - async fn inh_fut() -> i32 { 42 } + async fn inh_fut() -> i32 { + // NOTE: this code is here just to check that the identation is correct in the suggested fix + let a = 42; + let b = 21; + if a < b { + let c = 21; + let d = 42; + if c < d { + let _ = 42; + } + } + 42 + } async fn meth_fut(&self) -> i32 { 42 } diff --git a/tests/ui/manual_async_fn.rs b/tests/ui/manual_async_fn.rs index bd5f9d1cf..d50c91918 100644 --- a/tests/ui/manual_async_fn.rs +++ b/tests/ui/manual_async_fn.rs @@ -36,7 +36,19 @@ async fn already_async() -> impl Future { struct S {} impl S { fn inh_fut() -> impl Future { - async { 42 } + async { + // NOTE: this code is here just to check that the identation is correct in the suggested fix + let a = 42; + let b = 21; + if a < b { + let c = 21; + let d = 42; + if c < d { + let _ = 42; + } + } + 42 + } } fn meth_fut(&self) -> impl Future { diff --git a/tests/ui/manual_async_fn.stderr b/tests/ui/manual_async_fn.stderr index 016fdf959..f278ee41a 100644 --- a/tests/ui/manual_async_fn.stderr +++ b/tests/ui/manual_async_fn.stderr @@ -1,4 +1,4 @@ -error: this function can be simplified using async syntax +error: this function can be simplified using the `async fn` syntax --> $DIR/manual_async_fn.rs:8:1 | LL | fn fut() -> impl Future { @@ -14,7 +14,7 @@ help: move the body of the async block to the enclosing function LL | fn fut() -> impl Future { 42 } | ^^^^^^ -error: this function can be simplified using async syntax +error: this function can be simplified using the `async fn` syntax --> $DIR/manual_async_fn.rs:12:1 | LL | fn empty_fut() -> impl Future { @@ -29,7 +29,7 @@ help: move the body of the async block to the enclosing function LL | fn empty_fut() -> impl Future {} | ^^ -error: this function can be simplified using async syntax +error: this function can be simplified using the `async fn` syntax --> $DIR/manual_async_fn.rs:16:1 | LL | fn core_fut() -> impl core::future::Future { @@ -44,7 +44,7 @@ help: move the body of the async block to the enclosing function LL | fn core_fut() -> impl core::future::Future { 42 } | ^^^^^^ -error: this function can be simplified using async syntax +error: this function can be simplified using the `async fn` syntax --> $DIR/manual_async_fn.rs:38:5 | LL | fn inh_fut() -> impl Future { @@ -56,11 +56,16 @@ LL | async fn inh_fut() -> i32 { | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: move the body of the async block to the enclosing function | -LL | fn inh_fut() -> impl Future { 42 } - | ^^^^^^ +LL | fn inh_fut() -> impl Future { +LL | // NOTE: this code is here just to check that the identation is correct in the suggested fix +LL | let a = 42; +LL | let b = 21; +LL | if a < b { +LL | let c = 21; + ... -error: this function can be simplified using async syntax - --> $DIR/manual_async_fn.rs:42:5 +error: this function can be simplified using the `async fn` syntax + --> $DIR/manual_async_fn.rs:54:5 | LL | fn meth_fut(&self) -> impl Future { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -74,8 +79,8 @@ help: move the body of the async block to the enclosing function LL | fn meth_fut(&self) -> impl Future { 42 } | ^^^^^^ -error: this function can be simplified using async syntax - --> $DIR/manual_async_fn.rs:46:5 +error: this function can be simplified using the `async fn` syntax + --> $DIR/manual_async_fn.rs:58:5 | LL | fn empty_fut(&self) -> impl Future { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ From 438877380a2bf591fc1294ab31bc7fb2598738ad Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= Date: Sat, 9 May 2020 01:27:30 +0200 Subject: [PATCH 0032/4780] deps: remove unused regex dependency from root crate --- Cargo.toml | 1 - 1 file changed, 1 deletion(-) diff --git a/Cargo.toml b/Cargo.toml index 63ce2cd8c..6999b6bd7 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -31,7 +31,6 @@ path = "src/driver.rs" # begin automatic update clippy_lints = { version = "0.0.212", path = "clippy_lints" } # end automatic update -regex = "1" semver = "0.9" rustc_tools_util = { version = "0.2.0", path = "rustc_tools_util"} tempfile = { version = "3.1.0", optional = true } From 0c14ea8ed79ebf0b7368659282136e876f247cc9 Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Sun, 3 May 2020 10:56:25 -0700 Subject: [PATCH 0033/4780] Allow 'use super::*;' imports --- clippy_lints/src/wildcard_imports.rs | 19 +++++++++++--- tests/ui/wildcard_imports.fixed | 38 ++++++++++++++++++++++++++++ tests/ui/wildcard_imports.rs | 38 ++++++++++++++++++++++++++++ tests/ui/wildcard_imports.stderr | 20 ++++++++++++++- 4 files changed, 111 insertions(+), 4 deletions(-) diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index f3038861c..70ad9a60a 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -3,7 +3,7 @@ use if_chain::if_chain; use rustc_errors::Applicability; use rustc_hir::{ def::{DefKind, Res}, - Item, ItemKind, UseKind, + Item, ItemKind, PathSegment, UseKind, }; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; @@ -83,8 +83,8 @@ impl LateLintPass<'_, '_> for WildcardImports { if_chain! { if !in_macro(item.span); if let ItemKind::Use(use_path, UseKind::Glob) = &item.kind; - // don't lint prelude glob imports - if !use_path.segments.iter().last().map_or(false, |ps| ps.ident.as_str() == "prelude"); + if !is_prelude_import(use_path.segments); + if !is_super_only_import_in_test(use_path.segments); let used_imports = cx.tcx.names_imported_by_glob_use(item.hir_id.owner); if !used_imports.is_empty(); // Already handled by `unused_imports` then { @@ -154,3 +154,16 @@ impl LateLintPass<'_, '_> for WildcardImports { } } } + +// Allow "...prelude::*" imports. +// Many crates have a prelude, and it is imported as a glob by design. +fn is_prelude_import(segments: &[PathSegment<'_>]) -> bool { + segments.iter().last().map_or(false, |ps| ps.ident.as_str() == "prelude") +} + +// Allow "super::*" imports. +// This is intended primarily to ease the process of writing unit tests. +fn is_super_only_import_in_test(segments: &[PathSegment<'_>]) -> bool { + segments.iter().len() == 1 && + segments.first().map_or(false, |ps| ps.ident.as_str() == "super") +} diff --git a/tests/ui/wildcard_imports.fixed b/tests/ui/wildcard_imports.fixed index ed6cc00ef..003f11009 100644 --- a/tests/ui/wildcard_imports.fixed +++ b/tests/ui/wildcard_imports.fixed @@ -155,3 +155,41 @@ fn test_weird_formatting() { exported(); foo(); } + +mod test_super_imports { + fn foofoo() {} + + mod use_super { + use super::*; + + fn with_super() { + let _ = foofoo(); + } + } + + mod use_explicit { + use test_super_imports::foofoo; + + fn with_explicit() { + let _ = foofoo(); + } + } + + mod use_double_super { + mod inner { + use super::super::foofoo; + + fn with_double_super() { + let _ = foofoo(); + } + } + } + + mod use_super_explicit { + use super::super::test_super_imports::foofoo; + + fn with_super_explicit() { + let _ = foofoo(); + } + } +} diff --git a/tests/ui/wildcard_imports.rs b/tests/ui/wildcard_imports.rs index c6d6efaec..7bd57c796 100644 --- a/tests/ui/wildcard_imports.rs +++ b/tests/ui/wildcard_imports.rs @@ -156,3 +156,41 @@ fn test_weird_formatting() { exported(); foo(); } + +mod test_super_imports { + fn foofoo() {} + + mod use_super { + use super::*; + + fn with_super() { + let _ = foofoo(); + } + } + + mod use_explicit { + use test_super_imports::*; + + fn with_explicit() { + let _ = foofoo(); + } + } + + mod use_double_super { + mod inner { + use super::super::*; + + fn with_double_super() { + let _ = foofoo(); + } + } + } + + mod use_super_explicit { + use super::super::test_super_imports::*; + + fn with_super_explicit() { + let _ = foofoo(); + } + } +} diff --git a/tests/ui/wildcard_imports.stderr b/tests/ui/wildcard_imports.stderr index 050e4c630..858dc2879 100644 --- a/tests/ui/wildcard_imports.stderr +++ b/tests/ui/wildcard_imports.stderr @@ -92,5 +92,23 @@ LL | use crate:: fn_mod:: LL | | *; | |_________^ help: try: `crate:: fn_mod::foo` -error: aborting due to 15 previous errors +error: usage of wildcard import + --> $DIR/wildcard_imports.rs:172:13 + | +LL | use test_super_imports::*; + | ^^^^^^^^^^^^^^^^^^^^^ help: try: `test_super_imports::foofoo` + +error: usage of wildcard import + --> $DIR/wildcard_imports.rs:181:17 + | +LL | use super::super::*; + | ^^^^^^^^^^^^^^^ help: try: `super::super::foofoo` + +error: usage of wildcard import + --> $DIR/wildcard_imports.rs:190:13 + | +LL | use super::super::test_super_imports::*; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `super::super::test_super_imports::foofoo` + +error: aborting due to 18 previous errors From bdc75dbb7bbdc379b1f8cc346151fac4e63d7deb Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Sun, 3 May 2020 11:18:10 -0700 Subject: [PATCH 0034/4780] Run `cargo dev fmt` --- clippy_lints/src/wildcard_imports.rs | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index 70ad9a60a..e7400642b 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -158,12 +158,14 @@ impl LateLintPass<'_, '_> for WildcardImports { // Allow "...prelude::*" imports. // Many crates have a prelude, and it is imported as a glob by design. fn is_prelude_import(segments: &[PathSegment<'_>]) -> bool { - segments.iter().last().map_or(false, |ps| ps.ident.as_str() == "prelude") + segments + .iter() + .last() + .map_or(false, |ps| ps.ident.as_str() == "prelude") } // Allow "super::*" imports. // This is intended primarily to ease the process of writing unit tests. fn is_super_only_import_in_test(segments: &[PathSegment<'_>]) -> bool { - segments.iter().len() == 1 && - segments.first().map_or(false, |ps| ps.ident.as_str() == "super") + segments.iter().len() == 1 && segments.first().map_or(false, |ps| ps.ident.as_str() == "super") } From 56f4e1c3a8be54c1c80de366618e83d8d7a6e9eb Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Thu, 7 May 2020 08:06:30 -0700 Subject: [PATCH 0035/4780] Check if the parent module name contains "test" --- clippy_lints/src/wildcard_imports.rs | 19 ++++++++++++------- tests/ui/wildcard_imports.fixed | 16 ++++++++++++---- tests/ui/wildcard_imports.rs | 16 ++++++++++++---- tests/ui/wildcard_imports.stderr | 14 ++++++++++---- 4 files changed, 46 insertions(+), 19 deletions(-) diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index e7400642b..a22d0e677 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -84,7 +84,7 @@ impl LateLintPass<'_, '_> for WildcardImports { if !in_macro(item.span); if let ItemKind::Use(use_path, UseKind::Glob) = &item.kind; if !is_prelude_import(use_path.segments); - if !is_super_only_import_in_test(use_path.segments); + if !(is_super_only_import(use_path.segments) && is_in_test_module(cx, item)); let used_imports = cx.tcx.names_imported_by_glob_use(item.hir_id.owner); if !used_imports.is_empty(); // Already handled by `unused_imports` then { @@ -109,8 +109,7 @@ impl LateLintPass<'_, '_> for WildcardImports { span = use_path.span.with_hi(item.span.hi() - BytePos(1)); } ( - span, - false, + span, false, ) }; @@ -164,8 +163,14 @@ fn is_prelude_import(segments: &[PathSegment<'_>]) -> bool { .map_or(false, |ps| ps.ident.as_str() == "prelude") } -// Allow "super::*" imports. -// This is intended primarily to ease the process of writing unit tests. -fn is_super_only_import_in_test(segments: &[PathSegment<'_>]) -> bool { - segments.iter().len() == 1 && segments.first().map_or(false, |ps| ps.ident.as_str() == "super") +// Allow "super::*" imports in tests. +fn is_super_only_import(segments: &[PathSegment<'_>]) -> bool { + segments.len() == 1 && segments[0].ident.as_str() == "super" +} + +fn is_in_test_module(cx: &LateContext<'_, '_>, item: &Item<'_>) -> bool { + let parent = cx.tcx.hir().get_parent_node(item.hir_id); + let parent_item = cx.tcx.hir().expect_item(parent); + let parent_name = parent_item.ident.name.as_str(); + parent_name.contains("test") } diff --git a/tests/ui/wildcard_imports.fixed b/tests/ui/wildcard_imports.fixed index 003f11009..1c5c01f65 100644 --- a/tests/ui/wildcard_imports.fixed +++ b/tests/ui/wildcard_imports.fixed @@ -159,7 +159,15 @@ fn test_weird_formatting() { mod test_super_imports { fn foofoo() {} - mod use_super { + mod use_super_should_be_replaced { + use super::foofoo; + + fn with_super() { + let _ = foofoo(); + } + } + + mod use_super_in_test_should_pass { use super::*; fn with_super() { @@ -167,7 +175,7 @@ mod test_super_imports { } } - mod use_explicit { + mod use_explicit_should_be_replaced { use test_super_imports::foofoo; fn with_explicit() { @@ -175,7 +183,7 @@ mod test_super_imports { } } - mod use_double_super { + mod use_double_super_should_be_replaced { mod inner { use super::super::foofoo; @@ -185,7 +193,7 @@ mod test_super_imports { } } - mod use_super_explicit { + mod use_super_explicit_should_be_replaced { use super::super::test_super_imports::foofoo; fn with_super_explicit() { diff --git a/tests/ui/wildcard_imports.rs b/tests/ui/wildcard_imports.rs index 7bd57c796..f783149ef 100644 --- a/tests/ui/wildcard_imports.rs +++ b/tests/ui/wildcard_imports.rs @@ -160,7 +160,7 @@ fn test_weird_formatting() { mod test_super_imports { fn foofoo() {} - mod use_super { + mod use_super_should_be_replaced { use super::*; fn with_super() { @@ -168,7 +168,15 @@ mod test_super_imports { } } - mod use_explicit { + mod use_super_in_test_should_pass { + use super::*; + + fn with_super() { + let _ = foofoo(); + } + } + + mod use_explicit_should_be_replaced { use test_super_imports::*; fn with_explicit() { @@ -176,7 +184,7 @@ mod test_super_imports { } } - mod use_double_super { + mod use_double_super_should_be_replaced { mod inner { use super::super::*; @@ -186,7 +194,7 @@ mod test_super_imports { } } - mod use_super_explicit { + mod use_super_explicit_should_be_replaced { use super::super::test_super_imports::*; fn with_super_explicit() { diff --git a/tests/ui/wildcard_imports.stderr b/tests/ui/wildcard_imports.stderr index 858dc2879..649d550a8 100644 --- a/tests/ui/wildcard_imports.stderr +++ b/tests/ui/wildcard_imports.stderr @@ -93,22 +93,28 @@ LL | | *; | |_________^ help: try: `crate:: fn_mod::foo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:172:13 + --> $DIR/wildcard_imports.rs:164:13 + | +LL | use super::*; + | ^^^^^^^^ help: try: `super::foofoo` + +error: usage of wildcard import + --> $DIR/wildcard_imports.rs:180:13 | LL | use test_super_imports::*; | ^^^^^^^^^^^^^^^^^^^^^ help: try: `test_super_imports::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:181:17 + --> $DIR/wildcard_imports.rs:189:17 | LL | use super::super::*; | ^^^^^^^^^^^^^^^ help: try: `super::super::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:190:13 + --> $DIR/wildcard_imports.rs:198:13 | LL | use super::super::test_super_imports::*; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `super::super::test_super_imports::foofoo` -error: aborting due to 18 previous errors +error: aborting due to 19 previous errors From ad92486d52fdede5c712dd27c868c942d8240704 Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Thu, 7 May 2020 14:41:54 -0700 Subject: [PATCH 0036/4780] Add check for "test" in parent name. Include flag for disabling wildcard import exceptions --- clippy_lints/src/lib.rs | 3 +- clippy_lints/src/utils/conf.rs | 2 + clippy_lints/src/wildcard_imports.rs | 48 +++++++++++++++---- .../toml_unknown_key/conf_unknown_key.stderr | 2 +- tests/ui/wildcard_imports.fixed | 17 +++++-- tests/ui/wildcard_imports.rs | 17 +++++-- tests/ui/wildcard_imports.stderr | 14 +++--- 7 files changed, 75 insertions(+), 28 deletions(-) diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index fb2e9932b..4b67c84e3 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -1058,7 +1058,8 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: let max_struct_bools = conf.max_struct_bools; store.register_early_pass(move || box excessive_bools::ExcessiveBools::new(max_struct_bools, max_fn_params_bools)); store.register_early_pass(|| box option_env_unwrap::OptionEnvUnwrap); - store.register_late_pass(|| box wildcard_imports::WildcardImports); + let warn_on_all_wildcard_imports = conf.warn_on_all_wildcard_imports; + store.register_late_pass(move || box wildcard_imports::WildcardImports::new(warn_on_all_wildcard_imports)); store.register_early_pass(|| box macro_use::MacroUseImports); store.register_late_pass(|| box verbose_file_reads::VerboseFileReads); store.register_late_pass(|| box redundant_pub_crate::RedundantPubCrate::default()); diff --git a/clippy_lints/src/utils/conf.rs b/clippy_lints/src/utils/conf.rs index 4b81ff334..57b9eafd1 100644 --- a/clippy_lints/src/utils/conf.rs +++ b/clippy_lints/src/utils/conf.rs @@ -158,6 +158,8 @@ define_Conf! { (max_struct_bools, "max_struct_bools": u64, 3), /// Lint: FN_PARAMS_EXCESSIVE_BOOLS. The maximum number of bools function parameters can have (max_fn_params_bools, "max_fn_params_bools": u64, 3), + /// Lint: WILDCARD_IMPORTS. Whether to allow certain wildcard imports (prelude, super in tests). + (warn_on_all_wildcard_imports, "warn_on_all_wildcard_imports": bool, false), } impl Default for Conf { diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index a22d0e677..43d0d1b9e 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -6,7 +6,7 @@ use rustc_hir::{ Item, ItemKind, PathSegment, UseKind, }; use rustc_lint::{LateContext, LateLintPass}; -use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_session::{declare_tool_lint, impl_lint_pass}; use rustc_span::BytePos; declare_clippy_lint! { @@ -73,18 +73,38 @@ declare_clippy_lint! { "lint `use _::*` statements" } -declare_lint_pass!(WildcardImports => [ENUM_GLOB_USE, WILDCARD_IMPORTS]); +#[derive(Default)] +pub struct WildcardImports { + warn_on_all: bool, + is_test_module: bool, + test_modules_deep: u32, +} + +impl WildcardImports { + pub fn new(warn_on_all: bool) -> Self { + Self { + warn_on_all, + is_test_module: false, + test_modules_deep: 0, + } + } +} + +impl_lint_pass!(WildcardImports => [ENUM_GLOB_USE, WILDCARD_IMPORTS]); impl LateLintPass<'_, '_> for WildcardImports { fn check_item(&mut self, cx: &LateContext<'_, '_>, item: &Item<'_>) { if item.vis.node.is_pub() || item.vis.node.is_pub_restricted() { return; } + if is_test_module(item) { + self.is_test_module = true; + self.test_modules_deep += 1; + } if_chain! { if !in_macro(item.span); if let ItemKind::Use(use_path, UseKind::Glob) = &item.kind; - if !is_prelude_import(use_path.segments); - if !(is_super_only_import(use_path.segments) && is_in_test_module(cx, item)); + if self.warn_on_all || !self.check_exceptions(use_path.segments); let used_imports = cx.tcx.names_imported_by_glob_use(item.hir_id.owner); if !used_imports.is_empty(); // Already handled by `unused_imports` then { @@ -152,6 +172,19 @@ impl LateLintPass<'_, '_> for WildcardImports { } } } + + fn check_item_post(&mut self, _: &LateContext<'_, '_>, _: &Item<'_>) { + if self.is_test_module { + self.is_test_module = false; + self.test_modules_deep -= 1; + } + } +} + +impl WildcardImports { + fn check_exceptions(&self, segments: &[PathSegment<'_>]) -> bool { + is_prelude_import(segments) || (is_super_only_import(segments) && self.test_modules_deep > 0) + } } // Allow "...prelude::*" imports. @@ -168,9 +201,6 @@ fn is_super_only_import(segments: &[PathSegment<'_>]) -> bool { segments.len() == 1 && segments[0].ident.as_str() == "super" } -fn is_in_test_module(cx: &LateContext<'_, '_>, item: &Item<'_>) -> bool { - let parent = cx.tcx.hir().get_parent_node(item.hir_id); - let parent_item = cx.tcx.hir().expect_item(parent); - let parent_name = parent_item.ident.name.as_str(); - parent_name.contains("test") +fn is_test_module(item: &Item<'_>) -> bool { + item.ident.name.as_str().contains("test") } diff --git a/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr b/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr index 18f5d994b..53970af41 100644 --- a/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr +++ b/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr @@ -1,4 +1,4 @@ -error: error reading Clippy's configuration file `$DIR/clippy.toml`: unknown field `foobar`, expected one of `blacklisted-names`, `cognitive-complexity-threshold`, `cyclomatic-complexity-threshold`, `doc-valid-idents`, `too-many-arguments-threshold`, `type-complexity-threshold`, `single-char-binding-names-threshold`, `too-large-for-stack`, `enum-variant-name-threshold`, `enum-variant-size-threshold`, `verbose-bit-mask-threshold`, `literal-representation-threshold`, `trivial-copy-size-limit`, `too-many-lines-threshold`, `array-size-threshold`, `vec-box-size-threshold`, `max-struct-bools`, `max-fn-params-bools`, `third-party` at line 5 column 1 +error: error reading Clippy's configuration file `$DIR/clippy.toml`: unknown field `foobar`, expected one of `blacklisted-names`, `cognitive-complexity-threshold`, `cyclomatic-complexity-threshold`, `doc-valid-idents`, `too-many-arguments-threshold`, `type-complexity-threshold`, `single-char-binding-names-threshold`, `too-large-for-stack`, `enum-variant-name-threshold`, `enum-variant-size-threshold`, `verbose-bit-mask-threshold`, `literal-representation-threshold`, `trivial-copy-size-limit`, `too-many-lines-threshold`, `array-size-threshold`, `vec-box-size-threshold`, `max-struct-bools`, `max-fn-params-bools`, `warn-on-all-wildcard-imports`, `third-party` at line 5 column 1 error: aborting due to previous error diff --git a/tests/ui/wildcard_imports.fixed b/tests/ui/wildcard_imports.fixed index 1c5c01f65..98bf6acfe 100644 --- a/tests/ui/wildcard_imports.fixed +++ b/tests/ui/wildcard_imports.fixed @@ -156,10 +156,10 @@ fn test_weird_formatting() { foo(); } -mod test_super_imports { +mod super_imports { fn foofoo() {} - mod use_super_should_be_replaced { + mod should_be_replaced { use super::foofoo; fn with_super() { @@ -167,7 +167,7 @@ mod test_super_imports { } } - mod use_super_in_test_should_pass { + mod test_should_pass { use super::*; fn with_super() { @@ -175,8 +175,15 @@ mod test_super_imports { } } + mod inner { + fn test_should_pass() { + use super::*; + let _ = foofoo(); + } + } + mod use_explicit_should_be_replaced { - use test_super_imports::foofoo; + use super_imports::foofoo; fn with_explicit() { let _ = foofoo(); @@ -194,7 +201,7 @@ mod test_super_imports { } mod use_super_explicit_should_be_replaced { - use super::super::test_super_imports::foofoo; + use super::super::super_imports::foofoo; fn with_super_explicit() { let _ = foofoo(); diff --git a/tests/ui/wildcard_imports.rs b/tests/ui/wildcard_imports.rs index f783149ef..9275c5a09 100644 --- a/tests/ui/wildcard_imports.rs +++ b/tests/ui/wildcard_imports.rs @@ -157,10 +157,10 @@ fn test_weird_formatting() { foo(); } -mod test_super_imports { +mod super_imports { fn foofoo() {} - mod use_super_should_be_replaced { + mod should_be_replaced { use super::*; fn with_super() { @@ -168,7 +168,7 @@ mod test_super_imports { } } - mod use_super_in_test_should_pass { + mod test_should_pass { use super::*; fn with_super() { @@ -176,8 +176,15 @@ mod test_super_imports { } } + mod inner { + fn test_should_pass() { + use super::*; + let _ = foofoo(); + } + } + mod use_explicit_should_be_replaced { - use test_super_imports::*; + use super_imports::*; fn with_explicit() { let _ = foofoo(); @@ -195,7 +202,7 @@ mod test_super_imports { } mod use_super_explicit_should_be_replaced { - use super::super::test_super_imports::*; + use super::super::super_imports::*; fn with_super_explicit() { let _ = foofoo(); diff --git a/tests/ui/wildcard_imports.stderr b/tests/ui/wildcard_imports.stderr index 649d550a8..bd000ce81 100644 --- a/tests/ui/wildcard_imports.stderr +++ b/tests/ui/wildcard_imports.stderr @@ -99,22 +99,22 @@ LL | use super::*; | ^^^^^^^^ help: try: `super::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:180:13 + --> $DIR/wildcard_imports.rs:187:13 | -LL | use test_super_imports::*; - | ^^^^^^^^^^^^^^^^^^^^^ help: try: `test_super_imports::foofoo` +LL | use super_imports::*; + | ^^^^^^^^^^^^^^^^ help: try: `super_imports::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:189:17 + --> $DIR/wildcard_imports.rs:196:17 | LL | use super::super::*; | ^^^^^^^^^^^^^^^ help: try: `super::super::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:198:13 + --> $DIR/wildcard_imports.rs:205:13 | -LL | use super::super::test_super_imports::*; - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `super::super::test_super_imports::foofoo` +LL | use super::super::super_imports::*; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `super::super::super_imports::foofoo` error: aborting due to 19 previous errors From a42a2bdac2a6c881f85ebdbce66e84d977c74cfa Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Thu, 7 May 2020 14:48:27 -0700 Subject: [PATCH 0037/4780] Also have flag disable macro check --- clippy_lints/src/wildcard_imports.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index 43d0d1b9e..843ddda03 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -102,7 +102,7 @@ impl LateLintPass<'_, '_> for WildcardImports { self.test_modules_deep += 1; } if_chain! { - if !in_macro(item.span); + if self.warn_on_all || !in_macro(item.span); if let ItemKind::Use(use_path, UseKind::Glob) = &item.kind; if self.warn_on_all || !self.check_exceptions(use_path.segments); let used_imports = cx.tcx.names_imported_by_glob_use(item.hir_id.owner); From 152cdcb45be7a8f0f24dbcd4177e0858d94516b6 Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Fri, 8 May 2020 18:22:27 -0700 Subject: [PATCH 0038/4780] Remove unnecessary field, check for Mod/Fn ItemKind --- clippy_lints/src/wildcard_imports.rs | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index 843ddda03..48405a00d 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -76,7 +76,6 @@ declare_clippy_lint! { #[derive(Default)] pub struct WildcardImports { warn_on_all: bool, - is_test_module: bool, test_modules_deep: u32, } @@ -84,7 +83,6 @@ impl WildcardImports { pub fn new(warn_on_all: bool) -> Self { Self { warn_on_all, - is_test_module: false, test_modules_deep: 0, } } @@ -97,8 +95,7 @@ impl LateLintPass<'_, '_> for WildcardImports { if item.vis.node.is_pub() || item.vis.node.is_pub_restricted() { return; } - if is_test_module(item) { - self.is_test_module = true; + if is_test_module_or_function(item) { self.test_modules_deep += 1; } if_chain! { @@ -173,9 +170,8 @@ impl LateLintPass<'_, '_> for WildcardImports { } } - fn check_item_post(&mut self, _: &LateContext<'_, '_>, _: &Item<'_>) { - if self.is_test_module { - self.is_test_module = false; + fn check_item_post(&mut self, _: &LateContext<'_, '_>, item: &Item<'_>) { + if is_test_module_or_function(item) { self.test_modules_deep -= 1; } } @@ -201,6 +197,6 @@ fn is_super_only_import(segments: &[PathSegment<'_>]) -> bool { segments.len() == 1 && segments[0].ident.as_str() == "super" } -fn is_test_module(item: &Item<'_>) -> bool { - item.ident.name.as_str().contains("test") +fn is_test_module_or_function(item: &Item<'_>) -> bool { + matches!(item.kind, ItemKind::Fn(..) | ItemKind::Mod(..)) && item.ident.name.as_str().contains("test") } From 4db6abcd50eb07a7fa8349a059f80792b7b19a2e Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Sat, 9 May 2020 08:04:07 -0700 Subject: [PATCH 0039/4780] Remove check for Fn, reflect this in test cases, make test cases more robust/explicit --- clippy_lints/src/wildcard_imports.rs | 13 +++++++++---- tests/ui/wildcard_imports.fixed | 25 +++++++++++++++++++++++-- tests/ui/wildcard_imports.rs | 24 ++++++++++++++++++++++-- tests/ui/wildcard_imports.stderr | 14 ++++++++++---- 4 files changed, 64 insertions(+), 12 deletions(-) diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index 48405a00d..e12a6659a 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -43,9 +43,14 @@ declare_clippy_lint! { /// /// This can lead to confusing error messages at best and to unexpected behavior at worst. /// - /// Note that this will not warn about wildcard imports from modules named `prelude`; many - /// crates (including the standard library) provide modules named "prelude" specifically - /// designed for wildcard import. + /// **Exceptions:** + /// + /// Wildcard imports are allowed from modules named `prelude`. Many crates (including the standard library) + /// provide modules named "prelude" specifically designed for wildcard import. + /// + /// `use super::*` is allowed in test modules. This is defined as any module with "test" in the name. + /// + /// These exceptions can be disabled using the `warn-on-all-wildcard-imports` configuration flag. /// /// **Known problems:** If macros are imported through the wildcard, this macro is not included /// by the suggestion and has to be added by hand. @@ -198,5 +203,5 @@ fn is_super_only_import(segments: &[PathSegment<'_>]) -> bool { } fn is_test_module_or_function(item: &Item<'_>) -> bool { - matches!(item.kind, ItemKind::Fn(..) | ItemKind::Mod(..)) && item.ident.name.as_str().contains("test") + matches!(item.kind, ItemKind::Mod(..)) && item.ident.name.as_str().contains("test") } diff --git a/tests/ui/wildcard_imports.fixed b/tests/ui/wildcard_imports.fixed index 98bf6acfe..b47c8f23e 100644 --- a/tests/ui/wildcard_imports.fixed +++ b/tests/ui/wildcard_imports.fixed @@ -175,13 +175,34 @@ mod super_imports { } } - mod inner { - fn test_should_pass() { + mod test_should_pass_inside_function { + fn with_super_inside_function() { use super::*; let _ = foofoo(); } } + mod test_should_pass_further_inside { + fn insidefoo() {} + mod inner { + use super::*; + fn with_super() { + let _ = insidefoo(); + } + } + } + + mod should_be_replaced_futher_inside { + fn insidefoo() {} + mod inner { + use super::insidefoo; + fn with_super() { + let _ = insidefoo(); + } + } + } + + mod use_explicit_should_be_replaced { use super_imports::foofoo; diff --git a/tests/ui/wildcard_imports.rs b/tests/ui/wildcard_imports.rs index 9275c5a09..3ad1a29ae 100644 --- a/tests/ui/wildcard_imports.rs +++ b/tests/ui/wildcard_imports.rs @@ -176,13 +176,33 @@ mod super_imports { } } - mod inner { - fn test_should_pass() { + mod test_should_pass_inside_function { + fn with_super_inside_function() { use super::*; let _ = foofoo(); } } + mod test_should_pass_further_inside { + fn insidefoo() {} + mod inner { + use super::*; + fn with_super() { + let _ = insidefoo(); + } + } + } + + mod should_be_replaced_futher_inside { + fn insidefoo() {} + mod inner { + use super::*; + fn with_super() { + let _ = insidefoo(); + } + } + } + mod use_explicit_should_be_replaced { use super_imports::*; diff --git a/tests/ui/wildcard_imports.stderr b/tests/ui/wildcard_imports.stderr index bd000ce81..de07bd1d6 100644 --- a/tests/ui/wildcard_imports.stderr +++ b/tests/ui/wildcard_imports.stderr @@ -99,22 +99,28 @@ LL | use super::*; | ^^^^^^^^ help: try: `super::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:187:13 + --> $DIR/wildcard_imports.rs:199:17 + | +LL | use super::*; + | ^^^^^^^^ help: try: `super::insidefoo` + +error: usage of wildcard import + --> $DIR/wildcard_imports.rs:208:13 | LL | use super_imports::*; | ^^^^^^^^^^^^^^^^ help: try: `super_imports::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:196:17 + --> $DIR/wildcard_imports.rs:217:17 | LL | use super::super::*; | ^^^^^^^^^^^^^^^ help: try: `super::super::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:205:13 + --> $DIR/wildcard_imports.rs:226:13 | LL | use super::super::super_imports::*; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `super::super::super_imports::foofoo` -error: aborting due to 19 previous errors +error: aborting due to 20 previous errors From a339766136a183327faaf13b987be30b2940872e Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Sat, 9 May 2020 08:33:35 -0700 Subject: [PATCH 0040/4780] Fix test from auto-formatter fix --- tests/ui/wildcard_imports.fixed | 1 - 1 file changed, 1 deletion(-) diff --git a/tests/ui/wildcard_imports.fixed b/tests/ui/wildcard_imports.fixed index b47c8f23e..67423e6ec 100644 --- a/tests/ui/wildcard_imports.fixed +++ b/tests/ui/wildcard_imports.fixed @@ -202,7 +202,6 @@ mod super_imports { } } - mod use_explicit_should_be_replaced { use super_imports::foofoo; From 0ba61c612ee873314d252ca1f747c14a2f0161ba Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Sat, 9 May 2020 10:14:29 -0700 Subject: [PATCH 0041/4780] Check is_macro inside check_exceptions, update references to fix test --- clippy_lints/src/wildcard_imports.rs | 13 +++++++------ tests/ui/wildcard_imports.stderr | 6 +++--- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index e12a6659a..2c4e24780 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -101,12 +101,11 @@ impl LateLintPass<'_, '_> for WildcardImports { return; } if is_test_module_or_function(item) { - self.test_modules_deep += 1; + self.test_modules_deep = self.test_modules_deep.saturating_add(1); } if_chain! { - if self.warn_on_all || !in_macro(item.span); if let ItemKind::Use(use_path, UseKind::Glob) = &item.kind; - if self.warn_on_all || !self.check_exceptions(use_path.segments); + if self.warn_on_all || !self.check_exceptions(item, use_path.segments); let used_imports = cx.tcx.names_imported_by_glob_use(item.hir_id.owner); if !used_imports.is_empty(); // Already handled by `unused_imports` then { @@ -177,14 +176,16 @@ impl LateLintPass<'_, '_> for WildcardImports { fn check_item_post(&mut self, _: &LateContext<'_, '_>, item: &Item<'_>) { if is_test_module_or_function(item) { - self.test_modules_deep -= 1; + self.test_modules_deep = self.test_modules_deep.saturating_sub(1); } } } impl WildcardImports { - fn check_exceptions(&self, segments: &[PathSegment<'_>]) -> bool { - is_prelude_import(segments) || (is_super_only_import(segments) && self.test_modules_deep > 0) + fn check_exceptions(&self, item: &Item<'_>, segments: &[PathSegment<'_>]) -> bool { + in_macro(item.span) + || is_prelude_import(segments) + || (is_super_only_import(segments) && self.test_modules_deep > 0) } } diff --git a/tests/ui/wildcard_imports.stderr b/tests/ui/wildcard_imports.stderr index de07bd1d6..fab43b738 100644 --- a/tests/ui/wildcard_imports.stderr +++ b/tests/ui/wildcard_imports.stderr @@ -105,19 +105,19 @@ LL | use super::*; | ^^^^^^^^ help: try: `super::insidefoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:208:13 + --> $DIR/wildcard_imports.rs:207:13 | LL | use super_imports::*; | ^^^^^^^^^^^^^^^^ help: try: `super_imports::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:217:17 + --> $DIR/wildcard_imports.rs:216:17 | LL | use super::super::*; | ^^^^^^^^^^^^^^^ help: try: `super::super::foofoo` error: usage of wildcard import - --> $DIR/wildcard_imports.rs:226:13 + --> $DIR/wildcard_imports.rs:225:13 | LL | use super::super::super_imports::*; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `super::super::super_imports::foofoo` From b69200b8468434bc3f5b9ef8468733e5d40f4e01 Mon Sep 17 00:00:00 2001 From: Glenn Hope Date: Sat, 9 May 2020 10:16:47 -0700 Subject: [PATCH 0042/4780] Move is_test_module check to top of function --- clippy_lints/src/wildcard_imports.rs | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index 2c4e24780..32d9a45c3 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -97,12 +97,12 @@ impl_lint_pass!(WildcardImports => [ENUM_GLOB_USE, WILDCARD_IMPORTS]); impl LateLintPass<'_, '_> for WildcardImports { fn check_item(&mut self, cx: &LateContext<'_, '_>, item: &Item<'_>) { - if item.vis.node.is_pub() || item.vis.node.is_pub_restricted() { - return; - } if is_test_module_or_function(item) { self.test_modules_deep = self.test_modules_deep.saturating_add(1); } + if item.vis.node.is_pub() || item.vis.node.is_pub_restricted() { + return; + } if_chain! { if let ItemKind::Use(use_path, UseKind::Glob) = &item.kind; if self.warn_on_all || !self.check_exceptions(item, use_path.segments); From 318b8b6aabb2ef0fae0c0aafbba2c7ad97fb3a2a Mon Sep 17 00:00:00 2001 From: Mark Rousskov Date: Sun, 10 May 2020 22:15:04 -0400 Subject: [PATCH 0043/4780] Add hint for collect type --- clippy_lints/src/utils/mod.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index f7a91fcdd..8d75e1269 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -1390,7 +1390,7 @@ pub fn fn_has_unsatisfiable_preds(cx: &LateContext<'_, '_>, did: DefId) -> bool .predicates .iter() .filter_map(|(p, _)| if p.is_global() { Some(*p) } else { None }) - .collect(); + .collect::>(); !traits::normalize_and_test_predicates( cx.tcx, traits::elaborate_predicates(cx.tcx, predicates) From 01662d3a23fcd39f41fd15a8254fed814592e0c3 Mon Sep 17 00:00:00 2001 From: Jack Huey Date: Thu, 7 May 2020 17:46:31 -0400 Subject: [PATCH 0044/4780] Fix nit and cargo.lock --- util/dev | 7 +++++++ 1 file changed, 7 insertions(+) create mode 100755 util/dev diff --git a/util/dev b/util/dev new file mode 100755 index 000000000..319de217e --- /dev/null +++ b/util/dev @@ -0,0 +1,7 @@ +#!/bin/sh +CARGO_TARGET_DIR=$(pwd)/target/ +export CARGO_TARGET_DIR + +echo 'Deprecated! `util/dev` usage is deprecated, please use `cargo dev` instead.' + +cd clippy_dev && cargo run -- "$@" From 8ab3224b3b273f4911943800c56dc4aa925bc4c5 Mon Sep 17 00:00:00 2001 From: Camille GILLOT Date: Fri, 8 May 2020 13:57:01 +0200 Subject: [PATCH 0045/4780] Fix clippy. --- clippy_lints/src/bytecount.rs | 7 ++++--- clippy_lints/src/inline_fn_without_body.rs | 5 +++-- clippy_lints/src/len_zero.rs | 6 +++--- clippy_lints/src/lib.rs | 2 +- clippy_lints/src/map_clone.rs | 4 ++-- clippy_lints/src/non_expressive_names.rs | 4 ++-- clippy_lints/src/unsafe_removed_from_name.rs | 4 ++-- clippy_lints/src/utils/hir_utils.rs | 4 ++-- clippy_lints/src/utils/internal_lints.rs | 10 +++++----- clippy_lints/src/utils/mod.rs | 2 +- clippy_lints/src/utils/ptr.rs | 9 ++++----- clippy_lints/src/utils/usage.rs | 5 ++--- 12 files changed, 31 insertions(+), 31 deletions(-) diff --git a/clippy_lints/src/bytecount.rs b/clippy_lints/src/bytecount.rs index 91d3e47d7..278d04373 100644 --- a/clippy_lints/src/bytecount.rs +++ b/clippy_lints/src/bytecount.rs @@ -3,12 +3,13 @@ use crate::utils::{ span_lint_and_sugg, walk_ptrs_ty, }; use if_chain::if_chain; -use rustc_ast::ast::{Name, UintTy}; +use rustc_ast::ast::{UintTy}; use rustc_errors::Applicability; use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind, UnOp}; use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_span::Symbol; declare_clippy_lint! { /// **What it does:** Checks for naive byte counts @@ -95,11 +96,11 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ByteCount { } } -fn check_arg(name: Name, arg: Name, needle: &Expr<'_>) -> bool { +fn check_arg(name: Symbol, arg: Symbol, needle: &Expr<'_>) -> bool { name == arg && !contains_name(name, needle) } -fn get_path_name(expr: &Expr<'_>) -> Option { +fn get_path_name(expr: &Expr<'_>) -> Option { match expr.kind { ExprKind::Box(ref e) | ExprKind::AddrOf(BorrowKind::Ref, _, ref e) | ExprKind::Unary(UnOp::UnDeref, ref e) => { get_path_name(e) diff --git a/clippy_lints/src/inline_fn_without_body.rs b/clippy_lints/src/inline_fn_without_body.rs index 1ebfb3c81..475610dda 100644 --- a/clippy_lints/src/inline_fn_without_body.rs +++ b/clippy_lints/src/inline_fn_without_body.rs @@ -2,11 +2,12 @@ use crate::utils::span_lint_and_then; use crate::utils::sugg::DiagnosticBuilderExt; -use rustc_ast::ast::{Attribute, Name}; +use rustc_ast::ast::Attribute; use rustc_errors::Applicability; use rustc_hir::{TraitFn, TraitItem, TraitItemKind}; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_span::Symbol; declare_clippy_lint! { /// **What it does:** Checks for `#[inline]` on trait methods without bodies @@ -38,7 +39,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InlineFnWithoutBody { } } -fn check_attrs(cx: &LateContext<'_, '_>, name: Name, attrs: &[Attribute]) { +fn check_attrs(cx: &LateContext<'_, '_>, name: Symbol, attrs: &[Attribute]) { for attr in attrs { if !attr.check_name(sym!(inline)) { continue; diff --git a/clippy_lints/src/len_zero.rs b/clippy_lints/src/len_zero.rs index 1d86ca969..2ec0b5a8d 100644 --- a/clippy_lints/src/len_zero.rs +++ b/clippy_lints/src/len_zero.rs @@ -1,5 +1,5 @@ use crate::utils::{get_item_name, snippet_with_applicability, span_lint, span_lint_and_sugg, walk_ptrs_ty}; -use rustc_ast::ast::{LitKind, Name}; +use rustc_ast::ast::LitKind; use rustc_data_structures::fx::FxHashSet; use rustc_errors::Applicability; use rustc_hir::def_id::DefId; @@ -7,7 +7,7 @@ use rustc_hir::{AssocItemKind, BinOpKind, Expr, ExprKind, ImplItemRef, Item, Ite use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; -use rustc_span::source_map::{Span, Spanned}; +use rustc_span::source_map::{Span, Spanned, Symbol}; declare_clippy_lint! { /// **What it does:** Checks for getting the length of something via `.len()` @@ -226,7 +226,7 @@ fn check_cmp(cx: &LateContext<'_, '_>, span: Span, method: &Expr<'_>, lit: &Expr fn check_len( cx: &LateContext<'_, '_>, span: Span, - method_name: Name, + method_name: Symbol, args: &[Expr<'_>], lit: &LitKind, op: &str, diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 4b67c84e3..51b5401da 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -335,7 +335,7 @@ mod zero_div_zero; pub use crate::utils::conf::Conf; mod reexport { - pub use rustc_ast::ast::Name; + pub use rustc_span::Symbol as Name; } /// Register all pre expansion lints diff --git a/clippy_lints/src/map_clone.rs b/clippy_lints/src/map_clone.rs index 0b346393a..0163b3f8d 100644 --- a/clippy_lints/src/map_clone.rs +++ b/clippy_lints/src/map_clone.rs @@ -3,14 +3,14 @@ use crate::utils::{ is_copy, is_type_diagnostic_item, match_trait_method, remove_blocks, snippet_with_applicability, span_lint_and_sugg, }; use if_chain::if_chain; -use rustc_ast::ast::Ident; use rustc_errors::Applicability; use rustc_hir as hir; use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::mir::Mutability; use rustc_middle::ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; -use rustc_span::source_map::Span; +use rustc_span::Span; +use rustc_span::symbol::Ident; declare_clippy_lint! { /// **What it does:** Checks for usage of `iterator.map(|x| x.clone())` and suggests diff --git a/clippy_lints/src/non_expressive_names.rs b/clippy_lints/src/non_expressive_names.rs index 45809b359..2b51b7320 100644 --- a/clippy_lints/src/non_expressive_names.rs +++ b/clippy_lints/src/non_expressive_names.rs @@ -1,13 +1,13 @@ use crate::utils::{span_lint, span_lint_and_then}; use rustc_ast::ast::{ - Arm, AssocItem, AssocItemKind, Attribute, Block, FnDecl, Ident, Item, ItemKind, Local, MacCall, Pat, PatKind, + Arm, AssocItem, AssocItemKind, Attribute, Block, FnDecl, Item, ItemKind, Local, MacCall, Pat, PatKind, }; use rustc_ast::attr; use rustc_ast::visit::{walk_block, walk_expr, walk_pat, Visitor}; use rustc_lint::{EarlyContext, EarlyLintPass}; use rustc_session::{declare_tool_lint, impl_lint_pass}; use rustc_span::source_map::Span; -use rustc_span::symbol::SymbolStr; +use rustc_span::symbol::{Ident, SymbolStr}; use std::cmp::Ordering; declare_clippy_lint! { diff --git a/clippy_lints/src/unsafe_removed_from_name.rs b/clippy_lints/src/unsafe_removed_from_name.rs index 86c469a4d..735800e7e 100644 --- a/clippy_lints/src/unsafe_removed_from_name.rs +++ b/clippy_lints/src/unsafe_removed_from_name.rs @@ -1,9 +1,9 @@ use crate::utils::span_lint; -use rustc_ast::ast::{Ident, Item, ItemKind, UseTree, UseTreeKind}; +use rustc_ast::ast::{Item, ItemKind, UseTree, UseTreeKind}; use rustc_lint::{EarlyContext, EarlyLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; -use rustc_span::symbol::SymbolStr; +use rustc_span::symbol::{Ident, SymbolStr}; declare_clippy_lint! { /// **What it does:** Checks for imports that remove "unsafe" from an item's diff --git a/clippy_lints/src/utils/hir_utils.rs b/clippy_lints/src/utils/hir_utils.rs index 02b721fd3..bd7da57c6 100644 --- a/clippy_lints/src/utils/hir_utils.rs +++ b/clippy_lints/src/utils/hir_utils.rs @@ -1,6 +1,5 @@ use crate::consts::{constant_context, constant_simple}; use crate::utils::differing_macro_contexts; -use rustc_ast::ast::Name; use rustc_data_structures::stable_hasher::{HashStable, StableHasher}; use rustc_hir::{ BinOpKind, Block, BlockCheckMode, BodyId, BorrowKind, CaptureBy, Expr, ExprKind, Field, FnRetTy, GenericArg, @@ -10,6 +9,7 @@ use rustc_hir::{ use rustc_lint::LateContext; use rustc_middle::ich::StableHashingContextProvider; use rustc_middle::ty::TypeckTables; +use rustc_span::Symbol; use std::hash::Hash; /// Type used to check whether two ast are the same. This is different from the @@ -544,7 +544,7 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> { } } - pub fn hash_name(&mut self, n: Name) { + pub fn hash_name(&mut self, n: Symbol) { n.as_str().hash(&mut self.s); } diff --git a/clippy_lints/src/utils/internal_lints.rs b/clippy_lints/src/utils/internal_lints.rs index 5bf9acdc5..8e1b047f6 100644 --- a/clippy_lints/src/utils/internal_lints.rs +++ b/clippy_lints/src/utils/internal_lints.rs @@ -4,7 +4,7 @@ use crate::utils::{ span_lint_and_help, span_lint_and_sugg, walk_ptrs_ty, }; use if_chain::if_chain; -use rustc_ast::ast::{Crate as AstCrate, ItemKind, LitKind, Name, NodeId}; +use rustc_ast::ast::{Crate as AstCrate, ItemKind, LitKind, NodeId}; use rustc_ast::visit::FnKind; use rustc_data_structures::fx::{FxHashMap, FxHashSet}; use rustc_errors::Applicability; @@ -17,7 +17,7 @@ use rustc_lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass}; use rustc_middle::hir::map::Map; use rustc_session::{declare_lint_pass, declare_tool_lint, impl_lint_pass}; use rustc_span::source_map::{Span, Spanned}; -use rustc_span::symbol::SymbolStr; +use rustc_span::symbol::{Symbol, SymbolStr}; use std::borrow::{Borrow, Cow}; @@ -245,8 +245,8 @@ impl EarlyLintPass for ClippyLintsInternal { #[derive(Clone, Debug, Default)] pub struct LintWithoutLintPass { - declared_lints: FxHashMap, - registered_lints: FxHashSet, + declared_lints: FxHashMap, + registered_lints: FxHashSet, } impl_lint_pass!(LintWithoutLintPass => [DEFAULT_LINT, LINT_WITHOUT_LINT_PASS]); @@ -357,7 +357,7 @@ fn is_lint_ref_type<'tcx>(cx: &LateContext<'_, 'tcx>, ty: &Ty<'_>) -> bool { } struct LintCollector<'a, 'tcx> { - output: &'a mut FxHashSet, + output: &'a mut FxHashSet, cx: &'a LateContext<'a, 'tcx>, } diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index 1c7b40fa9..3b8ef18bf 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -1077,7 +1077,7 @@ pub fn is_allowed(cx: &LateContext<'_, '_>, lint: &'static Lint, id: HirId) -> b cx.tcx.lint_level_at_node(lint, id).0 == Level::Allow } -pub fn get_arg_name(pat: &Pat<'_>) -> Option { +pub fn get_arg_name(pat: &Pat<'_>) -> Option { match pat.kind { PatKind::Binding(.., ident, None) => Some(ident.name), PatKind::Ref(ref subpat, _) => get_arg_name(subpat), diff --git a/clippy_lints/src/utils/ptr.rs b/clippy_lints/src/utils/ptr.rs index 240bf2449..fb6bd5e81 100644 --- a/clippy_lints/src/utils/ptr.rs +++ b/clippy_lints/src/utils/ptr.rs @@ -1,10 +1,9 @@ use crate::utils::{get_pat_name, match_var, snippet}; -use rustc_ast::ast::Name; use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor}; use rustc_hir::{Body, BodyId, Expr, ExprKind, Param}; use rustc_lint::LateContext; use rustc_middle::hir::map::Map; -use rustc_span::source_map::Span; +use rustc_span::{Span, Symbol}; use std::borrow::Cow; pub fn get_spans( @@ -25,7 +24,7 @@ pub fn get_spans( fn extract_clone_suggestions<'a, 'tcx>( cx: &LateContext<'a, 'tcx>, - name: Name, + name: Symbol, replace: &[(&'static str, &'static str)], body: &'tcx Body<'_>, ) -> Option)>> { @@ -46,7 +45,7 @@ fn extract_clone_suggestions<'a, 'tcx>( struct PtrCloneVisitor<'a, 'tcx> { cx: &'a LateContext<'a, 'tcx>, - name: Name, + name: Symbol, replace: &'a [(&'static str, &'static str)], spans: Vec<(Span, Cow<'static, str>)>, abort: bool, @@ -83,6 +82,6 @@ impl<'a, 'tcx> Visitor<'tcx> for PtrCloneVisitor<'a, 'tcx> { } } -fn get_binding_name(arg: &Param<'_>) -> Option { +fn get_binding_name(arg: &Param<'_>) -> Option { get_pat_name(&arg.pat) } diff --git a/clippy_lints/src/utils/usage.rs b/clippy_lints/src/utils/usage.rs index c14da6aac..e85356779 100644 --- a/clippy_lints/src/utils/usage.rs +++ b/clippy_lints/src/utils/usage.rs @@ -1,5 +1,4 @@ use crate::utils::match_var; -use rustc_ast::ast; use rustc_data_structures::fx::FxHashSet; use rustc_hir::def::Res; use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor}; @@ -8,7 +7,7 @@ use rustc_infer::infer::TyCtxtInferExt; use rustc_lint::LateContext; use rustc_middle::hir::map::Map; use rustc_middle::ty; -use rustc_span::symbol::Ident; +use rustc_span::symbol::{Ident, Symbol}; use rustc_typeck::expr_use_visitor::{ConsumeMode, Delegate, ExprUseVisitor, Place, PlaceBase}; /// Returns a set of mutated local variable IDs, or `None` if mutations could not be determined. @@ -78,7 +77,7 @@ impl<'tcx> Delegate<'tcx> for MutVarsDelegate { } pub struct UsedVisitor { - pub var: ast::Name, // var to look for + pub var: Symbol, // var to look for pub used: bool, // has the var been used otherwise? } From 33a3d852f53d38e738719c294c83bd03d50d2ac6 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Mon, 11 May 2020 21:28:14 +0200 Subject: [PATCH 0046/4780] Fix fallout Re-remove util/dev file --- util/dev | 7 ------- 1 file changed, 7 deletions(-) delete mode 100755 util/dev diff --git a/util/dev b/util/dev deleted file mode 100755 index 319de217e..000000000 --- a/util/dev +++ /dev/null @@ -1,7 +0,0 @@ -#!/bin/sh -CARGO_TARGET_DIR=$(pwd)/target/ -export CARGO_TARGET_DIR - -echo 'Deprecated! `util/dev` usage is deprecated, please use `cargo dev` instead.' - -cd clippy_dev && cargo run -- "$@" From 505280b108f777ae941d4056a87f77fb7f513a7e Mon Sep 17 00:00:00 2001 From: flip1995 Date: Mon, 11 May 2020 21:31:01 +0200 Subject: [PATCH 0047/4780] Run cargo dev fmt --- clippy_lints/src/bytecount.rs | 2 +- clippy_lints/src/map_clone.rs | 2 +- clippy_lints/src/utils/usage.rs | 4 ++-- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/clippy_lints/src/bytecount.rs b/clippy_lints/src/bytecount.rs index 278d04373..90c00ad09 100644 --- a/clippy_lints/src/bytecount.rs +++ b/clippy_lints/src/bytecount.rs @@ -3,7 +3,7 @@ use crate::utils::{ span_lint_and_sugg, walk_ptrs_ty, }; use if_chain::if_chain; -use rustc_ast::ast::{UintTy}; +use rustc_ast::ast::UintTy; use rustc_errors::Applicability; use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind, UnOp}; use rustc_lint::{LateContext, LateLintPass}; diff --git a/clippy_lints/src/map_clone.rs b/clippy_lints/src/map_clone.rs index 0163b3f8d..d5adf6b0f 100644 --- a/clippy_lints/src/map_clone.rs +++ b/clippy_lints/src/map_clone.rs @@ -9,8 +9,8 @@ use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::mir::Mutability; use rustc_middle::ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; -use rustc_span::Span; use rustc_span::symbol::Ident; +use rustc_span::Span; declare_clippy_lint! { /// **What it does:** Checks for usage of `iterator.map(|x| x.clone())` and suggests diff --git a/clippy_lints/src/utils/usage.rs b/clippy_lints/src/utils/usage.rs index e85356779..904d948ad 100644 --- a/clippy_lints/src/utils/usage.rs +++ b/clippy_lints/src/utils/usage.rs @@ -77,8 +77,8 @@ impl<'tcx> Delegate<'tcx> for MutVarsDelegate { } pub struct UsedVisitor { - pub var: Symbol, // var to look for - pub used: bool, // has the var been used otherwise? + pub var: Symbol, // var to look for + pub used: bool, // has the var been used otherwise? } impl<'tcx> Visitor<'tcx> for UsedVisitor { From eec17d2c21605655188eaa13fd73d43c99162805 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Mon, 11 May 2020 21:40:33 +0200 Subject: [PATCH 0048/4780] Update failing test --- tests/ui/implicit_saturating_sub.fixed | 4 ++-- tests/ui/implicit_saturating_sub.rs | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/tests/ui/implicit_saturating_sub.fixed b/tests/ui/implicit_saturating_sub.fixed index e0b5b31a0..859765d08 100644 --- a/tests/ui/implicit_saturating_sub.fixed +++ b/tests/ui/implicit_saturating_sub.fixed @@ -29,8 +29,8 @@ fn main() { // Lint u_16 = u_16.saturating_sub(1); - let mut end_32: u32 = 7000; - let mut start_32: u32 = 7010; + let mut end_32: u32 = 7010; + let mut start_32: u32 = 7000; let mut u_32: u32 = end_32 - start_32; diff --git a/tests/ui/implicit_saturating_sub.rs b/tests/ui/implicit_saturating_sub.rs index 39d816089..24cb216e7 100644 --- a/tests/ui/implicit_saturating_sub.rs +++ b/tests/ui/implicit_saturating_sub.rs @@ -35,8 +35,8 @@ fn main() { u_16 -= 1; } - let mut end_32: u32 = 7000; - let mut start_32: u32 = 7010; + let mut end_32: u32 = 7010; + let mut start_32: u32 = 7000; let mut u_32: u32 = end_32 - start_32; From f20b96277397db2c9021d06cf8647014ccdc0a39 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Wed, 13 May 2020 01:04:16 +0200 Subject: [PATCH 0049/4780] unused_unit: lint also in type parameters and where clauses --- clippy_lints/src/returns.rs | 64 ++++++++++++++++++++----------- tests/ui/unused_unit.fixed | 21 ++++++++-- tests/ui/unused_unit.rs | 18 +++++++-- tests/ui/unused_unit.stderr | 76 +++++++++++++++++++++++++++++++------ 4 files changed, 138 insertions(+), 41 deletions(-) diff --git a/clippy_lints/src/returns.rs b/clippy_lints/src/returns.rs index 5c9117d5b..35464f629 100644 --- a/clippy_lints/src/returns.rs +++ b/clippy_lints/src/returns.rs @@ -248,28 +248,7 @@ impl EarlyLintPass for Return { if let ast::TyKind::Tup(ref vals) = ty.kind; if vals.is_empty() && !ty.span.from_expansion() && get_def(span) == get_def(ty.span); then { - let (rspan, appl) = if let Ok(fn_source) = - cx.sess().source_map() - .span_to_snippet(span.with_hi(ty.span.hi())) { - if let Some(rpos) = fn_source.rfind("->") { - #[allow(clippy::cast_possible_truncation)] - (ty.span.with_lo(BytePos(span.lo().0 + rpos as u32)), - Applicability::MachineApplicable) - } else { - (ty.span, Applicability::MaybeIncorrect) - } - } else { - (ty.span, Applicability::MaybeIncorrect) - }; - span_lint_and_sugg( - cx, - UNUSED_UNIT, - rspan, - "unneeded unit return type", - "remove the `-> ()`", - String::new(), - appl, - ); + lint_unneeded_unit_return(cx, ty, span); } } } @@ -313,6 +292,22 @@ impl EarlyLintPass for Return { _ => (), } } + + fn check_poly_trait_ref(&mut self, cx: &EarlyContext<'_>, poly: &ast::PolyTraitRef, _: &ast::TraitBoundModifier) { + let segments = &poly.trait_ref.path.segments; + + if_chain! { + if segments.len() == 1; + if ["Fn", "FnMut", "FnOnce"].contains(&&*segments[0].ident.name.as_str()); + if let Some(args) = &segments[0].args; + if let ast::GenericArgs::Parenthesized(generic_args) = &**args; + if let ast::FnRetTy::Ty(ty) = &generic_args.output; + if ty.kind.is_unit(); + then { + lint_unneeded_unit_return(cx, ty, generic_args.span); + } + } + } } fn attr_is_cfg(attr: &ast::Attribute) -> bool { @@ -337,3 +332,28 @@ fn is_unit_expr(expr: &ast::Expr) -> bool { false } } + +fn lint_unneeded_unit_return(cx: &EarlyContext<'_>, ty: &ast::Ty, span: Span) { + let (ret_span, appl) = if let Ok(fn_source) = cx.sess().source_map().span_to_snippet(span.with_hi(ty.span.hi())) { + if let Some(rpos) = fn_source.rfind("->") { + #[allow(clippy::cast_possible_truncation)] + ( + ty.span.with_lo(BytePos(span.lo().0 + rpos as u32)), + Applicability::MachineApplicable, + ) + } else { + (ty.span, Applicability::MaybeIncorrect) + } + } else { + (ty.span, Applicability::MaybeIncorrect) + }; + span_lint_and_sugg( + cx, + UNUSED_UNIT, + ret_span, + "unneeded unit return type", + "remove the `-> ()`", + String::new(), + appl, + ); +} diff --git a/tests/ui/unused_unit.fixed b/tests/ui/unused_unit.fixed index 3f6362472..07f279178 100644 --- a/tests/ui/unused_unit.fixed +++ b/tests/ui/unused_unit.fixed @@ -14,11 +14,10 @@ struct Unitter; impl Unitter { - // try to disorient the lint with multiple unit returns and newlines #[allow(clippy::no_effect)] - pub fn get_unit (), G>(&self, f: F, _g: G) - where G: Fn() -> () { - let _y: &dyn Fn() -> () = &f; + pub fn get_unit(&self, f: F, _g: G) + where G: Fn() { + let _y: &dyn Fn() = &f; (); // this should not lint, as it's not in return type position } } @@ -30,6 +29,20 @@ impl Into<()> for Unitter { } } +trait Trait { + fn redundant(&self, _f: F, _g: G, _h: H) + where + G: FnMut() , + H: Fn() ; +} + +impl Trait for Unitter { + fn redundant(&self, _f: F, _g: G, _h: H) + where + G: FnMut() , + H: Fn() {} +} + fn return_unit() { } #[allow(clippy::needless_return)] diff --git a/tests/ui/unused_unit.rs b/tests/ui/unused_unit.rs index 8fc072ebd..e2c6afb02 100644 --- a/tests/ui/unused_unit.rs +++ b/tests/ui/unused_unit.rs @@ -14,10 +14,8 @@ struct Unitter; impl Unitter { - // try to disorient the lint with multiple unit returns and newlines #[allow(clippy::no_effect)] - pub fn get_unit (), G>(&self, f: F, _g: G) -> - () + pub fn get_unit (), G>(&self, f: F, _g: G) -> () where G: Fn() -> () { let _y: &dyn Fn() -> () = &f; (); // this should not lint, as it's not in return type position @@ -31,6 +29,20 @@ impl Into<()> for Unitter { } } +trait Trait { + fn redundant (), G, H>(&self, _f: F, _g: G, _h: H) + where + G: FnMut() -> (), + H: Fn() -> (); +} + +impl Trait for Unitter { + fn redundant (), G, H>(&self, _f: F, _g: G, _h: H) + where + G: FnMut() -> (), + H: Fn() -> () {} +} + fn return_unit() -> () { () } #[allow(clippy::needless_return)] diff --git a/tests/ui/unused_unit.stderr b/tests/ui/unused_unit.stderr index a013d2b34..81e6738e6 100644 --- a/tests/ui/unused_unit.stderr +++ b/tests/ui/unused_unit.stderr @@ -1,10 +1,8 @@ error: unneeded unit return type - --> $DIR/unused_unit.rs:19:59 + --> $DIR/unused_unit.rs:18:29 | -LL | pub fn get_unit (), G>(&self, f: F, _g: G) -> - | ___________________________________________________________^ -LL | | () - | |__________^ help: remove the `-> ()` +LL | pub fn get_unit (), G>(&self, f: F, _g: G) -> () + | ^^^^^ help: remove the `-> ()` | note: the lint level is defined here --> $DIR/unused_unit.rs:12:9 @@ -13,40 +11,94 @@ LL | #![deny(clippy::unused_unit)] | ^^^^^^^^^^^^^^^^^^^ error: unneeded unit return type - --> $DIR/unused_unit.rs:29:19 + --> $DIR/unused_unit.rs:19:19 + | +LL | where G: Fn() -> () { + | ^^^^^ help: remove the `-> ()` + +error: unneeded unit return type + --> $DIR/unused_unit.rs:18:59 + | +LL | pub fn get_unit (), G>(&self, f: F, _g: G) -> () + | ^^^^^ help: remove the `-> ()` + +error: unneeded unit return type + --> $DIR/unused_unit.rs:20:27 + | +LL | let _y: &dyn Fn() -> () = &f; + | ^^^^^ help: remove the `-> ()` + +error: unneeded unit return type + --> $DIR/unused_unit.rs:27:19 | LL | fn into(self) -> () { | ^^^^^ help: remove the `-> ()` error: unneeded unit expression - --> $DIR/unused_unit.rs:30:9 + --> $DIR/unused_unit.rs:28:9 | LL | () | ^^ help: remove the final `()` error: unneeded unit return type - --> $DIR/unused_unit.rs:34:18 + --> $DIR/unused_unit.rs:33:30 + | +LL | fn redundant (), G, H>(&self, _f: F, _g: G, _h: H) + | ^^^^^ help: remove the `-> ()` + +error: unneeded unit return type + --> $DIR/unused_unit.rs:35:20 + | +LL | G: FnMut() -> (), + | ^^^^^ help: remove the `-> ()` + +error: unneeded unit return type + --> $DIR/unused_unit.rs:36:17 + | +LL | H: Fn() -> (); + | ^^^^^ help: remove the `-> ()` + +error: unneeded unit return type + --> $DIR/unused_unit.rs:40:30 + | +LL | fn redundant (), G, H>(&self, _f: F, _g: G, _h: H) + | ^^^^^ help: remove the `-> ()` + +error: unneeded unit return type + --> $DIR/unused_unit.rs:42:20 + | +LL | G: FnMut() -> (), + | ^^^^^ help: remove the `-> ()` + +error: unneeded unit return type + --> $DIR/unused_unit.rs:43:17 + | +LL | H: Fn() -> () {} + | ^^^^^ help: remove the `-> ()` + +error: unneeded unit return type + --> $DIR/unused_unit.rs:46:18 | LL | fn return_unit() -> () { () } | ^^^^^ help: remove the `-> ()` error: unneeded unit expression - --> $DIR/unused_unit.rs:34:26 + --> $DIR/unused_unit.rs:46:26 | LL | fn return_unit() -> () { () } | ^^ help: remove the final `()` error: unneeded `()` - --> $DIR/unused_unit.rs:44:14 + --> $DIR/unused_unit.rs:56:14 | LL | break(); | ^^ help: remove the `()` error: unneeded `()` - --> $DIR/unused_unit.rs:46:11 + --> $DIR/unused_unit.rs:58:11 | LL | return(); | ^^ help: remove the `()` -error: aborting due to 7 previous errors +error: aborting due to 16 previous errors From 8ffa0bfaa2452eb9c80bf0f1909b039efc8dd0c3 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 11 May 2020 00:52:33 +0200 Subject: [PATCH 0050/4780] New lint: reversed_empty_ranges --- CHANGELOG.md | 1 + clippy_lints/src/lib.rs | 3 + clippy_lints/src/ranges.rs | 112 +++++++++++++++++- tests/ui/reversed_empty_ranges_fixable.fixed | 24 ++++ tests/ui/reversed_empty_ranges_fixable.rs | 24 ++++ tests/ui/reversed_empty_ranges_fixable.stderr | 47 ++++++++ tests/ui/reversed_empty_ranges_unfixable.rs | 15 +++ .../ui/reversed_empty_ranges_unfixable.stderr | 34 ++++++ 8 files changed, 258 insertions(+), 2 deletions(-) create mode 100644 tests/ui/reversed_empty_ranges_fixable.fixed create mode 100644 tests/ui/reversed_empty_ranges_fixable.rs create mode 100644 tests/ui/reversed_empty_ranges_fixable.stderr create mode 100644 tests/ui/reversed_empty_ranges_unfixable.rs create mode 100644 tests/ui/reversed_empty_ranges_unfixable.stderr diff --git a/CHANGELOG.md b/CHANGELOG.md index 8457d6ad0..33b277fbd 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1546,6 +1546,7 @@ Released 2018-09-13 [`result_map_unwrap_or_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unwrap_or_else [`result_unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_unwrap_used [`reverse_range_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#reverse_range_loop +[`reversed_empty_ranges`]: https://rust-lang.github.io/rust-clippy/master/index.html#reversed_empty_ranges [`same_functions_in_if_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#same_functions_in_if_condition [`search_is_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#search_is_some [`serde_api_misuse`]: https://rust-lang.github.io/rust-clippy/master/index.html#serde_api_misuse diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 51b5401da..e1cb10a46 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -770,6 +770,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &ranges::RANGE_MINUS_ONE, &ranges::RANGE_PLUS_ONE, &ranges::RANGE_ZIP_WITH_LEN, + &ranges::REVERSED_EMPTY_RANGES, &redundant_clone::REDUNDANT_CLONE, &redundant_field_names::REDUNDANT_FIELD_NAMES, &redundant_pattern_matching::REDUNDANT_PATTERN_MATCHING, @@ -1384,6 +1385,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&question_mark::QUESTION_MARK), LintId::of(&ranges::RANGE_MINUS_ONE), LintId::of(&ranges::RANGE_ZIP_WITH_LEN), + LintId::of(&ranges::REVERSED_EMPTY_RANGES), LintId::of(&redundant_clone::REDUNDANT_CLONE), LintId::of(&redundant_field_names::REDUNDANT_FIELD_NAMES), LintId::of(&redundant_pattern_matching::REDUNDANT_PATTERN_MATCHING), @@ -1675,6 +1677,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&open_options::NONSENSICAL_OPEN_OPTIONS), LintId::of(&option_env_unwrap::OPTION_ENV_UNWRAP), LintId::of(&ptr::MUT_FROM_REF), + LintId::of(&ranges::REVERSED_EMPTY_RANGES), LintId::of(®ex::INVALID_REGEX), LintId::of(&serde_api::SERDE_API_MISUSE), LintId::of(&suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL), diff --git a/clippy_lints/src/ranges.rs b/clippy_lints/src/ranges.rs index d7ce2e66d..86d55ccab 100644 --- a/clippy_lints/src/ranges.rs +++ b/clippy_lints/src/ranges.rs @@ -1,14 +1,17 @@ +use crate::consts::{constant, Constant}; use if_chain::if_chain; use rustc_ast::ast::RangeLimits; use rustc_errors::Applicability; use rustc_hir::{BinOpKind, Expr, ExprKind, QPath}; use rustc_lint::{LateContext, LateLintPass}; +use rustc_middle::ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Spanned; +use std::cmp::Ordering; use crate::utils::sugg::Sugg; +use crate::utils::{get_parent_expr, is_integer_const, snippet, snippet_opt, span_lint, span_lint_and_then}; use crate::utils::{higher, SpanlessEq}; -use crate::utils::{is_integer_const, snippet, snippet_opt, span_lint, span_lint_and_then}; declare_clippy_lint! { /// **What it does:** Checks for zipping a collection with the range of @@ -84,10 +87,44 @@ declare_clippy_lint! { "`x..=(y-1)` reads better as `x..y`" } +declare_clippy_lint! { + /// **What it does:** Checks for range expressions `x..y` where both `x` and `y` + /// are constant and `x` is greater or equal to `y`. + /// + /// **Why is this bad?** Empty ranges yield no values so iterating them is a no-op. + /// Moreover, trying to use a reversed range to index a slice will panic at run-time. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// ```rust + /// fn main() { + /// (10..=0).for_each(|x| println!("{}", x)); + /// + /// let arr = [1, 2, 3, 4, 5]; + /// let sub = &arr[3..1]; + /// } + /// ``` + /// Use instead: + /// ```rust + /// fn main() { + /// (0..=10).rev().for_each(|x| println!("{}", x)); + /// + /// let arr = [1, 2, 3, 4, 5]; + /// let sub = &arr[1..3]; + /// } + /// ``` + pub REVERSED_EMPTY_RANGES, + correctness, + "reversing the limits of range expressions, resulting in empty ranges" +} + declare_lint_pass!(Ranges => [ RANGE_ZIP_WITH_LEN, RANGE_PLUS_ONE, - RANGE_MINUS_ONE + RANGE_MINUS_ONE, + REVERSED_EMPTY_RANGES, ]); impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Ranges { @@ -124,6 +161,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Ranges { check_exclusive_range_plus_one(cx, expr); check_inclusive_range_minus_one(cx, expr); + check_reversed_empty_range(cx, expr); } } @@ -202,6 +240,76 @@ fn check_inclusive_range_minus_one(cx: &LateContext<'_, '_>, expr: &Expr<'_>) { } } +fn check_reversed_empty_range(cx: &LateContext<'_, '_>, expr: &Expr<'_>) { + fn inside_indexing_expr(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { + matches!( + get_parent_expr(cx, expr), + Some(Expr { + kind: ExprKind::Index(..), + .. + }) + ) + } + + fn is_empty_range(limits: RangeLimits, ordering: Ordering) -> bool { + match limits { + RangeLimits::HalfOpen => ordering != Ordering::Less, + RangeLimits::Closed => ordering == Ordering::Greater, + } + } + + if_chain! { + if let Some(higher::Range { start: Some(start), end: Some(end), limits }) = higher::range(cx, expr); + let ty = cx.tables.expr_ty(start); + if let ty::Int(_) | ty::Uint(_) = ty.kind; + if let Some((start_idx, _)) = constant(cx, cx.tables, start); + if let Some((end_idx, _)) = constant(cx, cx.tables, end); + if let Some(ordering) = Constant::partial_cmp(cx.tcx, ty, &start_idx, &end_idx); + if is_empty_range(limits, ordering); + then { + if inside_indexing_expr(cx, expr) { + let (reason, outcome) = if ordering == Ordering::Equal { + ("empty", "always yield an empty slice") + } else { + ("reversed", "panic at run-time") + }; + + span_lint( + cx, + REVERSED_EMPTY_RANGES, + expr.span, + &format!("this range is {} and using it to index a slice will {}", reason, outcome), + ); + } else { + span_lint_and_then( + cx, + REVERSED_EMPTY_RANGES, + expr.span, + "this range is empty so it will yield no values", + |diag| { + if ordering != Ordering::Equal { + let start_snippet = snippet(cx, start.span, "_"); + let end_snippet = snippet(cx, end.span, "_"); + let dots = match limits { + RangeLimits::HalfOpen => "..", + RangeLimits::Closed => "..=" + }; + + diag.span_suggestion( + expr.span, + "consider using the following if you are attempting to iterate over this \ + range in reverse", + format!("({}{}{}).rev()", end_snippet, dots, start_snippet), + Applicability::MaybeIncorrect, + ); + } + }, + ); + } + } + } +} + fn y_plus_one<'t>(cx: &LateContext<'_, '_>, expr: &'t Expr<'_>) -> Option<&'t Expr<'t>> { match expr.kind { ExprKind::Binary( diff --git a/tests/ui/reversed_empty_ranges_fixable.fixed b/tests/ui/reversed_empty_ranges_fixable.fixed new file mode 100644 index 000000000..ee2cbc3cf --- /dev/null +++ b/tests/ui/reversed_empty_ranges_fixable.fixed @@ -0,0 +1,24 @@ +// run-rustfix +#![warn(clippy::reversed_empty_ranges)] + +const ANSWER: i32 = 42; + +fn main() { + (21..=42).rev().for_each(|x| println!("{}", x)); + let _ = (21..ANSWER).rev().filter(|x| x % 2 == 0).take(10).collect::>(); + + for _ in (-42..=-21).rev() {} + for _ in (21u32..42u32).rev() {} + + // These should be ignored as they are not empty ranges: + + (21..=42).for_each(|x| println!("{}", x)); + (21..42).for_each(|x| println!("{}", x)); + + let arr = [1, 2, 3, 4, 5]; + let _ = &arr[1..=3]; + let _ = &arr[1..3]; + + for _ in 21..=42 {} + for _ in 21..42 {} +} diff --git a/tests/ui/reversed_empty_ranges_fixable.rs b/tests/ui/reversed_empty_ranges_fixable.rs new file mode 100644 index 000000000..6ed5ca6da --- /dev/null +++ b/tests/ui/reversed_empty_ranges_fixable.rs @@ -0,0 +1,24 @@ +// run-rustfix +#![warn(clippy::reversed_empty_ranges)] + +const ANSWER: i32 = 42; + +fn main() { + (42..=21).for_each(|x| println!("{}", x)); + let _ = (ANSWER..21).filter(|x| x % 2 == 0).take(10).collect::>(); + + for _ in -21..=-42 {} + for _ in 42u32..21u32 {} + + // These should be ignored as they are not empty ranges: + + (21..=42).for_each(|x| println!("{}", x)); + (21..42).for_each(|x| println!("{}", x)); + + let arr = [1, 2, 3, 4, 5]; + let _ = &arr[1..=3]; + let _ = &arr[1..3]; + + for _ in 21..=42 {} + for _ in 21..42 {} +} diff --git a/tests/ui/reversed_empty_ranges_fixable.stderr b/tests/ui/reversed_empty_ranges_fixable.stderr new file mode 100644 index 000000000..97933b8ff --- /dev/null +++ b/tests/ui/reversed_empty_ranges_fixable.stderr @@ -0,0 +1,47 @@ +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_fixable.rs:7:5 + | +LL | (42..=21).for_each(|x| println!("{}", x)); + | ^^^^^^^^^ + | + = note: `-D clippy::reversed-empty-ranges` implied by `-D warnings` +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | (21..=42).rev().for_each(|x| println!("{}", x)); + | ^^^^^^^^^^^^^^^ + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_fixable.rs:8:13 + | +LL | let _ = (ANSWER..21).filter(|x| x % 2 == 0).take(10).collect::>(); + | ^^^^^^^^^^^^ + | +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | let _ = (21..ANSWER).rev().filter(|x| x % 2 == 0).take(10).collect::>(); + | ^^^^^^^^^^^^^^^^^^ + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_fixable.rs:10:14 + | +LL | for _ in -21..=-42 {} + | ^^^^^^^^^ + | +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | for _ in (-42..=-21).rev() {} + | ^^^^^^^^^^^^^^^^^ + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_fixable.rs:11:14 + | +LL | for _ in 42u32..21u32 {} + | ^^^^^^^^^^^^ + | +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | for _ in (21u32..42u32).rev() {} + | ^^^^^^^^^^^^^^^^^^^^ + +error: aborting due to 4 previous errors + diff --git a/tests/ui/reversed_empty_ranges_unfixable.rs b/tests/ui/reversed_empty_ranges_unfixable.rs new file mode 100644 index 000000000..c9ca4c476 --- /dev/null +++ b/tests/ui/reversed_empty_ranges_unfixable.rs @@ -0,0 +1,15 @@ +#![warn(clippy::reversed_empty_ranges)] + +const ANSWER: i32 = 42; +const SOME_NUM: usize = 3; + +fn main() { + let _ = (42 + 10..42 + 10).map(|x| x / 2).find(|&x| x == 21); + + let arr = [1, 2, 3, 4, 5]; + let _ = &arr[3usize..=1usize]; + let _ = &arr[SOME_NUM..1]; + let _ = &arr[3..3]; + + for _ in ANSWER..ANSWER {} +} diff --git a/tests/ui/reversed_empty_ranges_unfixable.stderr b/tests/ui/reversed_empty_ranges_unfixable.stderr new file mode 100644 index 000000000..12e5483ec --- /dev/null +++ b/tests/ui/reversed_empty_ranges_unfixable.stderr @@ -0,0 +1,34 @@ +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_unfixable.rs:7:13 + | +LL | let _ = (42 + 10..42 + 10).map(|x| x / 2).find(|&x| x == 21); + | ^^^^^^^^^^^^^^^^^^ + | + = note: `-D clippy::reversed-empty-ranges` implied by `-D warnings` + +error: this range is reversed and using it to index a slice will panic at run-time + --> $DIR/reversed_empty_ranges_unfixable.rs:10:18 + | +LL | let _ = &arr[3usize..=1usize]; + | ^^^^^^^^^^^^^^^ + +error: this range is reversed and using it to index a slice will panic at run-time + --> $DIR/reversed_empty_ranges_unfixable.rs:11:18 + | +LL | let _ = &arr[SOME_NUM..1]; + | ^^^^^^^^^^^ + +error: this range is empty and using it to index a slice will always yield an empty slice + --> $DIR/reversed_empty_ranges_unfixable.rs:12:18 + | +LL | let _ = &arr[3..3]; + | ^^^^ + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_unfixable.rs:14:14 + | +LL | for _ in ANSWER..ANSWER {} + | ^^^^^^^^^^^^^^ + +error: aborting due to 5 previous errors + From 0f2b1193f9501ffd06f9bf2ea8ab85a4db92f47b Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 11 May 2020 00:53:31 +0200 Subject: [PATCH 0051/4780] Remove reverse_range_loop lint --- CHANGELOG.md | 1 - clippy_lints/src/lib.rs | 7 +- clippy_lints/src/loops.rs | 102 +---------------------------- src/lintlist/mod.rs | 6 +- tests/ui/for_loop_fixable.fixed | 54 --------------- tests/ui/for_loop_fixable.rs | 54 --------------- tests/ui/for_loop_fixable.stderr | 88 +++++-------------------- tests/ui/for_loop_unfixable.rs | 18 ----- tests/ui/for_loop_unfixable.stderr | 11 ++-- tests/ui/manual_memcpy.rs | 2 +- 10 files changed, 32 insertions(+), 311 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index 33b277fbd..b25ef0493 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1545,7 +1545,6 @@ Released 2018-09-13 [`result_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unit_fn [`result_map_unwrap_or_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unwrap_or_else [`result_unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_unwrap_used -[`reverse_range_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#reverse_range_loop [`reversed_empty_ranges`]: https://rust-lang.github.io/rust-clippy/master/index.html#reversed_empty_ranges [`same_functions_in_if_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#same_functions_in_if_condition [`search_is_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#search_is_some diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index e1cb10a46..0c4daeb73 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -624,7 +624,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &loops::NEEDLESS_COLLECT, &loops::NEEDLESS_RANGE_LOOP, &loops::NEVER_LOOP, - &loops::REVERSE_RANGE_LOOP, &loops::WHILE_IMMUTABLE_CONDITION, &loops::WHILE_LET_LOOP, &loops::WHILE_LET_ON_ITERATOR, @@ -1284,7 +1283,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::NEEDLESS_COLLECT), LintId::of(&loops::NEEDLESS_RANGE_LOOP), LintId::of(&loops::NEVER_LOOP), - LintId::of(&loops::REVERSE_RANGE_LOOP), LintId::of(&loops::WHILE_IMMUTABLE_CONDITION), LintId::of(&loops::WHILE_LET_LOOP), LintId::of(&loops::WHILE_LET_ON_ITERATOR), @@ -1658,7 +1656,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::FOR_LOOP_OVER_RESULT), LintId::of(&loops::ITER_NEXT_LOOP), LintId::of(&loops::NEVER_LOOP), - LintId::of(&loops::REVERSE_RANGE_LOOP), LintId::of(&loops::WHILE_IMMUTABLE_CONDITION), LintId::of(&mem_discriminant::MEM_DISCRIMINANT_NON_ENUM), LintId::of(&mem_replace::MEM_REPLACE_WITH_UNINIT), @@ -1788,6 +1785,10 @@ fn register_removed_non_tool_lints(store: &mut rustc_lint::LintStore) { "unsafe_vector_initialization", "the replacement suggested by this lint had substantially different behavior", ); + store.register_removed( + "reverse_range_loop", + "this lint is now included in reversed_empty_ranges", + ); } /// Register renamed lints. diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 2bbf4dba6..0bc6b7085 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -1,4 +1,4 @@ -use crate::consts::{constant, Constant}; +use crate::consts::constant; use crate::reexport::Name; use crate::utils::paths; use crate::utils::usage::{is_unused, mutated_variables}; @@ -8,7 +8,7 @@ use crate::utils::{ multispan_sugg, snippet, snippet_opt, snippet_with_applicability, span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, SpanlessEq, }; -use crate::utils::{is_type_diagnostic_item, qpath_res, same_tys, sext, sugg}; +use crate::utils::{is_type_diagnostic_item, qpath_res, same_tys, sugg}; use if_chain::if_chain; use rustc_ast::ast; use rustc_data_structures::fx::{FxHashMap, FxHashSet}; @@ -270,30 +270,6 @@ declare_clippy_lint! { "collecting an iterator when collect is not needed" } -declare_clippy_lint! { - /// **What it does:** Checks for loops over ranges `x..y` where both `x` and `y` - /// are constant and `x` is greater or equal to `y`, unless the range is - /// reversed or has a negative `.step_by(_)`. - /// - /// **Why is it bad?** Such loops will either be skipped or loop until - /// wrap-around (in debug code, this may `panic!()`). Both options are probably - /// not intended. - /// - /// **Known problems:** The lint cannot catch loops over dynamically defined - /// ranges. Doing this would require simulating all possible inputs and code - /// paths through the program, which would be complex and error-prone. - /// - /// **Example:** - /// ```ignore - /// for x in 5..10 - 5 { - /// .. - /// } // oops, stray `-` - /// ``` - pub REVERSE_RANGE_LOOP, - correctness, - "iteration over an empty range, such as `10..0` or `5..5`" -} - declare_clippy_lint! { /// **What it does:** Checks `for` loops over slices with an explicit counter /// and suggests the use of `.enumerate()`. @@ -463,7 +439,6 @@ declare_lint_pass!(Loops => [ FOR_LOOP_OVER_OPTION, WHILE_LET_LOOP, NEEDLESS_COLLECT, - REVERSE_RANGE_LOOP, EXPLICIT_COUNTER_LOOP, EMPTY_LOOP, WHILE_LET_ON_ITERATOR, @@ -761,7 +736,6 @@ fn check_for_loop<'a, 'tcx>( expr: &'tcx Expr<'_>, ) { check_for_loop_range(cx, pat, arg, body, expr); - check_for_loop_reverse_range(cx, arg, expr); check_for_loop_arg(cx, pat, arg, expr); check_for_loop_explicit_counter(cx, pat, arg, body, expr); check_for_loop_over_map_kv(cx, pat, arg, body, expr); @@ -1248,78 +1222,6 @@ fn is_end_eq_array_len<'tcx>( false } -fn check_for_loop_reverse_range<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, arg: &'tcx Expr<'_>, expr: &'tcx Expr<'_>) { - // if this for loop is iterating over a two-sided range... - if let Some(higher::Range { - start: Some(start), - end: Some(end), - limits, - }) = higher::range(cx, arg) - { - // ...and both sides are compile-time constant integers... - if let Some((start_idx, _)) = constant(cx, cx.tables, start) { - if let Some((end_idx, _)) = constant(cx, cx.tables, end) { - // ...and the start index is greater than the end index, - // this loop will never run. This is often confusing for developers - // who think that this will iterate from the larger value to the - // smaller value. - let ty = cx.tables.expr_ty(start); - let (sup, eq) = match (start_idx, end_idx) { - (Constant::Int(start_idx), Constant::Int(end_idx)) => ( - match ty.kind { - ty::Int(ity) => sext(cx.tcx, start_idx, ity) > sext(cx.tcx, end_idx, ity), - ty::Uint(_) => start_idx > end_idx, - _ => false, - }, - start_idx == end_idx, - ), - _ => (false, false), - }; - - if sup { - let start_snippet = snippet(cx, start.span, "_"); - let end_snippet = snippet(cx, end.span, "_"); - let dots = if limits == ast::RangeLimits::Closed { - "..=" - } else { - ".." - }; - - span_lint_and_then( - cx, - REVERSE_RANGE_LOOP, - expr.span, - "this range is empty so this for loop will never run", - |diag| { - diag.span_suggestion( - arg.span, - "consider using the following if you are attempting to iterate over this \ - range in reverse", - format!( - "({end}{dots}{start}).rev()", - end = end_snippet, - dots = dots, - start = start_snippet - ), - Applicability::MaybeIncorrect, - ); - }, - ); - } else if eq && limits != ast::RangeLimits::Closed { - // if they are equal, it's also problematic - this loop - // will never run. - span_lint( - cx, - REVERSE_RANGE_LOOP, - expr.span, - "this range is empty so this for loop will never run", - ); - } - } - } - } -} - fn lint_iter_method(cx: &LateContext<'_, '_>, args: &[Expr<'_>], arg: &Expr<'_>, method_name: &str) { let mut applicability = Applicability::MachineApplicable; let object = snippet_with_applicability(cx, args[0].span, "_", &mut applicability); diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 51d1cb221..e1a6d4bdd 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1922,11 +1922,11 @@ pub static ref ALL_LINTS: Vec = vec![ module: "methods", }, Lint { - name: "reverse_range_loop", + name: "reversed_empty_ranges", group: "correctness", - desc: "iteration over an empty range, such as `10..0` or `5..5`", + desc: "reversing the limits of range expressions, resulting in empty ranges", deprecation: None, - module: "loops", + module: "ranges", }, Lint { name: "same_functions_in_if_condition", diff --git a/tests/ui/for_loop_fixable.fixed b/tests/ui/for_loop_fixable.fixed index 5fc84ada9..249a88a0b 100644 --- a/tests/ui/for_loop_fixable.fixed +++ b/tests/ui/for_loop_fixable.fixed @@ -21,7 +21,6 @@ impl Unrelated { clippy::explicit_iter_loop, clippy::explicit_into_iter_loop, clippy::iter_next_loop, - clippy::reverse_range_loop, clippy::for_kv_map )] #[allow( @@ -32,61 +31,8 @@ impl Unrelated { )] #[allow(clippy::many_single_char_names, unused_variables)] fn main() { - const MAX_LEN: usize = 42; let mut vec = vec![1, 2, 3, 4]; - for i in (0..10).rev() { - println!("{}", i); - } - - for i in (0..=10).rev() { - println!("{}", i); - } - - for i in (0..MAX_LEN).rev() { - println!("{}", i); - } - - for i in 5..=5 { - // not an error, this is the range with only one element “5” - println!("{}", i); - } - - for i in 0..10 { - // not an error, the start index is less than the end index - println!("{}", i); - } - - for i in -10..0 { - // not an error - println!("{}", i); - } - - for i in (10..0).map(|x| x * 2) { - // not an error, it can't be known what arbitrary methods do to a range - println!("{}", i); - } - - // testing that the empty range lint folds constants - for i in (5 + 4..10).rev() { - println!("{}", i); - } - - for i in ((3 - 1)..(5 + 2)).rev() { - println!("{}", i); - } - - for i in (2 * 2)..(2 * 3) { - // no error, 4..6 is fine - println!("{}", i); - } - - let x = 42; - for i in x..10 { - // no error, not constant-foldable - println!("{}", i); - } - // See #601 for i in 0..10 { // no error, id_col does not exist outside the loop diff --git a/tests/ui/for_loop_fixable.rs b/tests/ui/for_loop_fixable.rs index 4165b0dc0..306d85a63 100644 --- a/tests/ui/for_loop_fixable.rs +++ b/tests/ui/for_loop_fixable.rs @@ -21,7 +21,6 @@ impl Unrelated { clippy::explicit_iter_loop, clippy::explicit_into_iter_loop, clippy::iter_next_loop, - clippy::reverse_range_loop, clippy::for_kv_map )] #[allow( @@ -32,61 +31,8 @@ impl Unrelated { )] #[allow(clippy::many_single_char_names, unused_variables)] fn main() { - const MAX_LEN: usize = 42; let mut vec = vec![1, 2, 3, 4]; - for i in 10..0 { - println!("{}", i); - } - - for i in 10..=0 { - println!("{}", i); - } - - for i in MAX_LEN..0 { - println!("{}", i); - } - - for i in 5..=5 { - // not an error, this is the range with only one element “5” - println!("{}", i); - } - - for i in 0..10 { - // not an error, the start index is less than the end index - println!("{}", i); - } - - for i in -10..0 { - // not an error - println!("{}", i); - } - - for i in (10..0).map(|x| x * 2) { - // not an error, it can't be known what arbitrary methods do to a range - println!("{}", i); - } - - // testing that the empty range lint folds constants - for i in 10..5 + 4 { - println!("{}", i); - } - - for i in (5 + 2)..(3 - 1) { - println!("{}", i); - } - - for i in (2 * 2)..(2 * 3) { - // no error, 4..6 is fine - println!("{}", i); - } - - let x = 42; - for i in x..10 { - // no error, not constant-foldable - println!("{}", i); - } - // See #601 for i in 0..10 { // no error, id_col does not exist outside the loop diff --git a/tests/ui/for_loop_fixable.stderr b/tests/ui/for_loop_fixable.stderr index cffb4b9f0..ddfe66d67 100644 --- a/tests/ui/for_loop_fixable.stderr +++ b/tests/ui/for_loop_fixable.stderr @@ -1,61 +1,5 @@ -error: this range is empty so this for loop will never run - --> $DIR/for_loop_fixable.rs:38:14 - | -LL | for i in 10..0 { - | ^^^^^ - | - = note: `-D clippy::reverse-range-loop` implied by `-D warnings` -help: consider using the following if you are attempting to iterate over this range in reverse - | -LL | for i in (0..10).rev() { - | ^^^^^^^^^^^^^ - -error: this range is empty so this for loop will never run - --> $DIR/for_loop_fixable.rs:42:14 - | -LL | for i in 10..=0 { - | ^^^^^^ - | -help: consider using the following if you are attempting to iterate over this range in reverse - | -LL | for i in (0..=10).rev() { - | ^^^^^^^^^^^^^^ - -error: this range is empty so this for loop will never run - --> $DIR/for_loop_fixable.rs:46:14 - | -LL | for i in MAX_LEN..0 { - | ^^^^^^^^^^ - | -help: consider using the following if you are attempting to iterate over this range in reverse - | -LL | for i in (0..MAX_LEN).rev() { - | ^^^^^^^^^^^^^^^^^^ - -error: this range is empty so this for loop will never run - --> $DIR/for_loop_fixable.rs:71:14 - | -LL | for i in 10..5 + 4 { - | ^^^^^^^^^ - | -help: consider using the following if you are attempting to iterate over this range in reverse - | -LL | for i in (5 + 4..10).rev() { - | ^^^^^^^^^^^^^^^^^ - -error: this range is empty so this for loop will never run - --> $DIR/for_loop_fixable.rs:75:14 - | -LL | for i in (5 + 2)..(3 - 1) { - | ^^^^^^^^^^^^^^^^ - | -help: consider using the following if you are attempting to iterate over this range in reverse - | -LL | for i in ((3 - 1)..(5 + 2)).rev() { - | ^^^^^^^^^^^^^^^^^^^^^^^^ - error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:97:15 + --> $DIR/for_loop_fixable.rs:43:15 | LL | for _v in vec.iter() {} | ^^^^^^^^^^ help: to write this more concisely, try: `&vec` @@ -63,13 +7,13 @@ LL | for _v in vec.iter() {} = note: `-D clippy::explicit-iter-loop` implied by `-D warnings` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:99:15 + --> $DIR/for_loop_fixable.rs:45:15 | LL | for _v in vec.iter_mut() {} | ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&mut vec` error: it is more concise to loop over containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:102:15 + --> $DIR/for_loop_fixable.rs:48:15 | LL | for _v in out_vec.into_iter() {} | ^^^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `out_vec` @@ -77,76 +21,76 @@ LL | for _v in out_vec.into_iter() {} = note: `-D clippy::explicit-into-iter-loop` implied by `-D warnings` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:107:15 + --> $DIR/for_loop_fixable.rs:53:15 | LL | for _v in [1, 2, 3].iter() {} | ^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[1, 2, 3]` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:111:15 + --> $DIR/for_loop_fixable.rs:57:15 | LL | for _v in [0; 32].iter() {} | ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[0; 32]` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:116:15 + --> $DIR/for_loop_fixable.rs:62:15 | LL | for _v in ll.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&ll` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:119:15 + --> $DIR/for_loop_fixable.rs:65:15 | LL | for _v in vd.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&vd` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:122:15 + --> $DIR/for_loop_fixable.rs:68:15 | LL | for _v in bh.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&bh` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:125:15 + --> $DIR/for_loop_fixable.rs:71:15 | LL | for _v in hm.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&hm` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:128:15 + --> $DIR/for_loop_fixable.rs:74:15 | LL | for _v in bt.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&bt` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:131:15 + --> $DIR/for_loop_fixable.rs:77:15 | LL | for _v in hs.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&hs` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:134:15 + --> $DIR/for_loop_fixable.rs:80:15 | LL | for _v in bs.iter() {} | ^^^^^^^^^ help: to write this more concisely, try: `&bs` error: it is more concise to loop over containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:309:18 + --> $DIR/for_loop_fixable.rs:255:18 | LL | for i in iterator.into_iter() { | ^^^^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `iterator` error: it is more concise to loop over references to containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:329:18 + --> $DIR/for_loop_fixable.rs:275:18 | LL | for _ in t.into_iter() {} | ^^^^^^^^^^^^^ help: to write this more concisely, try: `&t` error: it is more concise to loop over containers instead of using explicit iteration methods - --> $DIR/for_loop_fixable.rs:331:18 + --> $DIR/for_loop_fixable.rs:277:18 | LL | for _ in r.into_iter() {} | ^^^^^^^^^^^^^ help: to write this more concisely, try: `r` -error: aborting due to 20 previous errors +error: aborting due to 15 previous errors diff --git a/tests/ui/for_loop_unfixable.rs b/tests/ui/for_loop_unfixable.rs index 179b255e0..e73536052 100644 --- a/tests/ui/for_loop_unfixable.rs +++ b/tests/ui/for_loop_unfixable.rs @@ -5,7 +5,6 @@ clippy::explicit_iter_loop, clippy::explicit_into_iter_loop, clippy::iter_next_loop, - clippy::reverse_range_loop, clippy::for_kv_map )] #[allow( @@ -16,25 +15,8 @@ unused, dead_code )] -#[allow(clippy::many_single_char_names, unused_variables)] fn main() { - for i in 5..5 { - println!("{}", i); - } - let vec = vec![1, 2, 3, 4]; for _v in vec.iter().next() {} - - for i in (5 + 2)..(8 - 1) { - println!("{}", i); - } - - const ZERO: usize = 0; - - for i in ZERO..vec.len() { - if f(&vec[i], &vec[i]) { - panic!("at the disco"); - } - } } diff --git a/tests/ui/for_loop_unfixable.stderr b/tests/ui/for_loop_unfixable.stderr index 1da8e0f35..1c9287b6a 100644 --- a/tests/ui/for_loop_unfixable.stderr +++ b/tests/ui/for_loop_unfixable.stderr @@ -1,9 +1,10 @@ -error[E0425]: cannot find function `f` in this scope - --> $DIR/for_loop_unfixable.rs:36:12 +error: you are iterating over `Iterator::next()` which is an Option; this will compile but is probably not what you want + --> $DIR/for_loop_unfixable.rs:21:15 | -LL | if f(&vec[i], &vec[i]) { - | ^ help: a local variable with a similar name exists: `i` +LL | for _v in vec.iter().next() {} + | ^^^^^^^^^^^^^^^^^ + | + = note: `-D clippy::iter-next-loop` implied by `-D warnings` error: aborting due to previous error -For more information about this error, try `rustc --explain E0425`. diff --git a/tests/ui/manual_memcpy.rs b/tests/ui/manual_memcpy.rs index 9c24d6d4d..0083f9479 100644 --- a/tests/ui/manual_memcpy.rs +++ b/tests/ui/manual_memcpy.rs @@ -104,7 +104,7 @@ pub fn manual_copy(src: &[i32], dst: &mut [i32], dst2: &mut [i32]) { dst[i - 0] = src[i]; } - #[allow(clippy::reverse_range_loop)] + #[allow(clippy::reversed_empty_ranges)] for i in 0..0 { dst[i] = src[i]; } From 064431d22fbc28f958a1d18da8a5e01ff99dadb0 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 11 May 2020 23:48:48 +0200 Subject: [PATCH 0052/4780] Re-add old tests for empty range loops --- .../reversed_empty_ranges_loops_fixable.fixed | 57 +++++++++++++++ .../ui/reversed_empty_ranges_loops_fixable.rs | 57 +++++++++++++++ ...reversed_empty_ranges_loops_fixable.stderr | 69 +++++++++++++++++++ .../reversed_empty_ranges_loops_unfixable.rs | 11 +++ ...versed_empty_ranges_loops_unfixable.stderr | 16 +++++ 5 files changed, 210 insertions(+) create mode 100644 tests/ui/reversed_empty_ranges_loops_fixable.fixed create mode 100644 tests/ui/reversed_empty_ranges_loops_fixable.rs create mode 100644 tests/ui/reversed_empty_ranges_loops_fixable.stderr create mode 100644 tests/ui/reversed_empty_ranges_loops_unfixable.rs create mode 100644 tests/ui/reversed_empty_ranges_loops_unfixable.stderr diff --git a/tests/ui/reversed_empty_ranges_loops_fixable.fixed b/tests/ui/reversed_empty_ranges_loops_fixable.fixed new file mode 100644 index 000000000..f1503ed6d --- /dev/null +++ b/tests/ui/reversed_empty_ranges_loops_fixable.fixed @@ -0,0 +1,57 @@ +// run-rustfix +#![warn(clippy::reversed_empty_ranges)] + +fn main() { + const MAX_LEN: usize = 42; + + for i in (0..10).rev() { + println!("{}", i); + } + + for i in (0..=10).rev() { + println!("{}", i); + } + + for i in (0..MAX_LEN).rev() { + println!("{}", i); + } + + for i in 5..=5 { + // not an error, this is the range with only one element “5” + println!("{}", i); + } + + for i in 0..10 { + // not an error, the start index is less than the end index + println!("{}", i); + } + + for i in -10..0 { + // not an error + println!("{}", i); + } + + for i in (0..10).rev().map(|x| x * 2) { + println!("{}", i); + } + + // testing that the empty range lint folds constants + for i in (5 + 4..10).rev() { + println!("{}", i); + } + + for i in ((3 - 1)..(5 + 2)).rev() { + println!("{}", i); + } + + for i in (2 * 2)..(2 * 3) { + // no error, 4..6 is fine + println!("{}", i); + } + + let x = 42; + for i in x..10 { + // no error, not constant-foldable + println!("{}", i); + } +} diff --git a/tests/ui/reversed_empty_ranges_loops_fixable.rs b/tests/ui/reversed_empty_ranges_loops_fixable.rs new file mode 100644 index 000000000..a733788dc --- /dev/null +++ b/tests/ui/reversed_empty_ranges_loops_fixable.rs @@ -0,0 +1,57 @@ +// run-rustfix +#![warn(clippy::reversed_empty_ranges)] + +fn main() { + const MAX_LEN: usize = 42; + + for i in 10..0 { + println!("{}", i); + } + + for i in 10..=0 { + println!("{}", i); + } + + for i in MAX_LEN..0 { + println!("{}", i); + } + + for i in 5..=5 { + // not an error, this is the range with only one element “5” + println!("{}", i); + } + + for i in 0..10 { + // not an error, the start index is less than the end index + println!("{}", i); + } + + for i in -10..0 { + // not an error + println!("{}", i); + } + + for i in (10..0).map(|x| x * 2) { + println!("{}", i); + } + + // testing that the empty range lint folds constants + for i in 10..5 + 4 { + println!("{}", i); + } + + for i in (5 + 2)..(3 - 1) { + println!("{}", i); + } + + for i in (2 * 2)..(2 * 3) { + // no error, 4..6 is fine + println!("{}", i); + } + + let x = 42; + for i in x..10 { + // no error, not constant-foldable + println!("{}", i); + } +} diff --git a/tests/ui/reversed_empty_ranges_loops_fixable.stderr b/tests/ui/reversed_empty_ranges_loops_fixable.stderr new file mode 100644 index 000000000..e89e040a0 --- /dev/null +++ b/tests/ui/reversed_empty_ranges_loops_fixable.stderr @@ -0,0 +1,69 @@ +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_loops_fixable.rs:7:14 + | +LL | for i in 10..0 { + | ^^^^^ + | + = note: `-D clippy::reversed-empty-ranges` implied by `-D warnings` +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | for i in (0..10).rev() { + | ^^^^^^^^^^^^^ + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_loops_fixable.rs:11:14 + | +LL | for i in 10..=0 { + | ^^^^^^ + | +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | for i in (0..=10).rev() { + | ^^^^^^^^^^^^^^ + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_loops_fixable.rs:15:14 + | +LL | for i in MAX_LEN..0 { + | ^^^^^^^^^^ + | +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | for i in (0..MAX_LEN).rev() { + | ^^^^^^^^^^^^^^^^^^ + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_loops_fixable.rs:34:14 + | +LL | for i in (10..0).map(|x| x * 2) { + | ^^^^^^^ + | +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | for i in (0..10).rev().map(|x| x * 2) { + | ^^^^^^^^^^^^^ + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_loops_fixable.rs:39:14 + | +LL | for i in 10..5 + 4 { + | ^^^^^^^^^ + | +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | for i in (5 + 4..10).rev() { + | ^^^^^^^^^^^^^^^^^ + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_loops_fixable.rs:43:14 + | +LL | for i in (5 + 2)..(3 - 1) { + | ^^^^^^^^^^^^^^^^ + | +help: consider using the following if you are attempting to iterate over this range in reverse + | +LL | for i in ((3 - 1)..(5 + 2)).rev() { + | ^^^^^^^^^^^^^^^^^^^^^^^^ + +error: aborting due to 6 previous errors + diff --git a/tests/ui/reversed_empty_ranges_loops_unfixable.rs b/tests/ui/reversed_empty_ranges_loops_unfixable.rs new file mode 100644 index 000000000..c4c572244 --- /dev/null +++ b/tests/ui/reversed_empty_ranges_loops_unfixable.rs @@ -0,0 +1,11 @@ +#![warn(clippy::reversed_empty_ranges)] + +fn main() { + for i in 5..5 { + println!("{}", i); + } + + for i in (5 + 2)..(8 - 1) { + println!("{}", i); + } +} diff --git a/tests/ui/reversed_empty_ranges_loops_unfixable.stderr b/tests/ui/reversed_empty_ranges_loops_unfixable.stderr new file mode 100644 index 000000000..30095d20c --- /dev/null +++ b/tests/ui/reversed_empty_ranges_loops_unfixable.stderr @@ -0,0 +1,16 @@ +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_loops_unfixable.rs:4:14 + | +LL | for i in 5..5 { + | ^^^^ + | + = note: `-D clippy::reversed-empty-ranges` implied by `-D warnings` + +error: this range is empty so it will yield no values + --> $DIR/reversed_empty_ranges_loops_unfixable.rs:8:14 + | +LL | for i in (5 + 2)..(8 - 1) { + | ^^^^^^^^^^^^^^^^ + +error: aborting due to 2 previous errors + From e4cd8e7961b553cac44671d63bc6dfc2223ea66b Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Tue, 12 May 2020 22:05:56 +0200 Subject: [PATCH 0053/4780] Fix ICE caused in unwrap module --- clippy_lints/src/unwrap.rs | 12 +++++++++-- .../ui/checked_unwrap/simple_conditionals.rs | 21 +++++++++++++++++++ 2 files changed, 31 insertions(+), 2 deletions(-) diff --git a/clippy_lints/src/unwrap.rs b/clippy_lints/src/unwrap.rs index f3844c7d3..8b971e706 100644 --- a/clippy_lints/src/unwrap.rs +++ b/clippy_lints/src/unwrap.rs @@ -8,6 +8,7 @@ use rustc_hir::{BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, Path, QPath, UnO use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::hir::map::Map; use rustc_middle::lint::in_external_macro; +use rustc_middle::ty::Ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; @@ -90,6 +91,14 @@ fn collect_unwrap_info<'a, 'tcx>( branch: &'tcx Expr<'_>, invert: bool, ) -> Vec> { + fn is_relevant_option_call(cx: &LateContext<'_, '_>, ty: Ty<'_>, method_name: &str) -> bool { + is_type_diagnostic_item(cx, ty, sym!(option_type)) && ["is_some", "is_none"].contains(&method_name) + } + + fn is_relevant_result_call(cx: &LateContext<'_, '_>, ty: Ty<'_>, method_name: &str) -> bool { + is_type_diagnostic_item(cx, ty, sym!(result_type)) && ["is_ok", "is_err"].contains(&method_name) + } + if let ExprKind::Binary(op, left, right) = &expr.kind { match (invert, op.node) { (false, BinOpKind::And) | (false, BinOpKind::BitAnd) | (true, BinOpKind::Or) | (true, BinOpKind::BitOr) => { @@ -106,9 +115,8 @@ fn collect_unwrap_info<'a, 'tcx>( if let ExprKind::MethodCall(method_name, _, args) = &expr.kind; if let ExprKind::Path(QPath::Resolved(None, path)) = &args[0].kind; let ty = cx.tables.expr_ty(&args[0]); - if is_type_diagnostic_item(cx, ty, sym!(option_type)) || is_type_diagnostic_item(cx, ty, sym!(result_type)); let name = method_name.ident.as_str(); - if ["is_some", "is_none", "is_ok", "is_err"].contains(&&*name); + if is_relevant_option_call(cx, ty, &name) || is_relevant_result_call(cx, ty, &name); then { assert!(args.len() == 1); let unwrappable = match name.as_ref() { diff --git a/tests/ui/checked_unwrap/simple_conditionals.rs b/tests/ui/checked_unwrap/simple_conditionals.rs index 3e7b4b390..49794e0c2 100644 --- a/tests/ui/checked_unwrap/simple_conditionals.rs +++ b/tests/ui/checked_unwrap/simple_conditionals.rs @@ -78,3 +78,24 @@ fn main() { assert!(x.is_ok(), "{:?}", x.unwrap_err()); // ok, it's a common test pattern } + +mod issue_5579 { + trait IsErr { + fn is_err(&self, err: &str) -> bool; + } + + impl IsErr for Option { + fn is_err(&self, _err: &str) -> bool { + true + } + } + + #[allow(unused)] + fn boom() { + let t = Some(1); + + if t.is_err("") { + t.unwrap(); + } + } +} From 8d1029d3ca013687422b58d0e99084a4e3421089 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Wed, 13 May 2020 20:47:44 +0200 Subject: [PATCH 0054/4780] Move test for issue 5579 under tests/ui/crashes --- .../ui/checked_unwrap/simple_conditionals.rs | 21 ------------------- tests/ui/crashes/ice-5579.rs | 17 +++++++++++++++ 2 files changed, 17 insertions(+), 21 deletions(-) create mode 100644 tests/ui/crashes/ice-5579.rs diff --git a/tests/ui/checked_unwrap/simple_conditionals.rs b/tests/ui/checked_unwrap/simple_conditionals.rs index 49794e0c2..3e7b4b390 100644 --- a/tests/ui/checked_unwrap/simple_conditionals.rs +++ b/tests/ui/checked_unwrap/simple_conditionals.rs @@ -78,24 +78,3 @@ fn main() { assert!(x.is_ok(), "{:?}", x.unwrap_err()); // ok, it's a common test pattern } - -mod issue_5579 { - trait IsErr { - fn is_err(&self, err: &str) -> bool; - } - - impl IsErr for Option { - fn is_err(&self, _err: &str) -> bool { - true - } - } - - #[allow(unused)] - fn boom() { - let t = Some(1); - - if t.is_err("") { - t.unwrap(); - } - } -} diff --git a/tests/ui/crashes/ice-5579.rs b/tests/ui/crashes/ice-5579.rs new file mode 100644 index 000000000..e1842c73f --- /dev/null +++ b/tests/ui/crashes/ice-5579.rs @@ -0,0 +1,17 @@ +trait IsErr { + fn is_err(&self, err: &str) -> bool; +} + +impl IsErr for Option { + fn is_err(&self, _err: &str) -> bool { + true + } +} + +fn main() { + let t = Some(1); + + if t.is_err("") { + t.unwrap(); + } +} From 671c1e34cc11767aa4ea257b9f5c40dcee1441fd Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Wed, 13 May 2020 21:07:13 +0200 Subject: [PATCH 0055/4780] Avoid running doctest that is expected to panic --- clippy_lints/src/ranges.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/clippy_lints/src/ranges.rs b/clippy_lints/src/ranges.rs index 86d55ccab..83c6faac0 100644 --- a/clippy_lints/src/ranges.rs +++ b/clippy_lints/src/ranges.rs @@ -98,7 +98,7 @@ declare_clippy_lint! { /// /// **Example:** /// - /// ```rust + /// ```rust,no_run /// fn main() { /// (10..=0).for_each(|x| println!("{}", x)); /// From 9217675c7f6ccd2efa18047ebb0c86841683b6a5 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Thu, 14 May 2020 00:26:09 +0200 Subject: [PATCH 0056/4780] Fix comparison_chain false positive --- clippy_lints/src/comparison_chain.rs | 17 +++++-- tests/ui/comparison_chain.rs | 66 ++++++++++++++++++++++++++++ 2 files changed, 80 insertions(+), 3 deletions(-) diff --git a/clippy_lints/src/comparison_chain.rs b/clippy_lints/src/comparison_chain.rs index 96df3ffe3..93e29edca 100644 --- a/clippy_lints/src/comparison_chain.rs +++ b/clippy_lints/src/comparison_chain.rs @@ -81,12 +81,23 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ComparisonChain { // Check that both sets of operands are equal let mut spanless_eq = SpanlessEq::new(cx); - if (!spanless_eq.eq_expr(lhs1, lhs2) || !spanless_eq.eq_expr(rhs1, rhs2)) - && (!spanless_eq.eq_expr(lhs1, rhs2) || !spanless_eq.eq_expr(rhs1, lhs2)) - { + let same_fixed_operands = spanless_eq.eq_expr(lhs1, lhs2) && spanless_eq.eq_expr(rhs1, rhs2); + let same_transposed_operands = spanless_eq.eq_expr(lhs1, rhs2) && spanless_eq.eq_expr(rhs1, lhs2); + + if !same_fixed_operands && !same_transposed_operands { return; } + // Check that if the operation is the same, either it's not `==` or the operands are transposed + if kind1.node == kind2.node { + if kind1.node == BinOpKind::Eq { + return; + } + if !same_transposed_operands { + return; + } + } + // Check that the type being compared implements `core::cmp::Ord` let ty = cx.tables.expr_ty(lhs1); let is_ord = get_trait_def_id(cx, &paths::ORD).map_or(false, |id| implements_trait(cx, ty, id, &[])); diff --git a/tests/ui/comparison_chain.rs b/tests/ui/comparison_chain.rs index 9c2128469..3b03f8c7d 100644 --- a/tests/ui/comparison_chain.rs +++ b/tests/ui/comparison_chain.rs @@ -137,4 +137,70 @@ fn h(x: T, y: T, z: T) { } } +// The following uses should be ignored +mod issue_5212 { + use super::{a, b, c}; + fn foo() -> u8 { + 21 + } + + fn same_operation_equals() { + // operands are fixed + + if foo() == 42 { + a() + } else if foo() == 42 { + b() + } + + if foo() == 42 { + a() + } else if foo() == 42 { + b() + } else { + c() + } + + // operands are transposed + + if foo() == 42 { + a() + } else if 42 == foo() { + b() + } + } + + fn same_operation_not_equals() { + // operands are fixed + + if foo() > 42 { + a() + } else if foo() > 42 { + b() + } + + if foo() > 42 { + a() + } else if foo() > 42 { + b() + } else { + c() + } + + if foo() < 42 { + a() + } else if foo() < 42 { + b() + } + + if foo() < 42 { + a() + } else if foo() < 42 { + b() + } else { + c() + } + } +} + fn main() {} From 945c9447093a2ca944e70bae125f2af69f8eac16 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sun, 3 May 2020 11:20:51 +0200 Subject: [PATCH 0057/4780] Merge `block_in_if_condition_expr` and `block_in_if_condition_stmt` lints into `block_in_if_condition` lint --- CHANGELOG.md | 3 +- clippy_lints/src/block_in_if_condition.rs | 53 +++++++++---------- clippy_lints/src/lib.rs | 9 ++-- src/lintlist/mod.rs | 11 +--- tests/ui/block_in_if_condition.fixed | 3 +- tests/ui/block_in_if_condition.rs | 3 +- tests/ui/block_in_if_condition.stderr | 10 ++-- tests/ui/block_in_if_condition_closure.rs | 5 +- tests/ui/block_in_if_condition_closure.stderr | 6 +-- 9 files changed, 42 insertions(+), 61 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index b25ef0493..0b270e6ac 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1274,8 +1274,7 @@ Released 2018-09-13 [`await_holding_lock`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_lock [`bad_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#bad_bit_mask [`blacklisted_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#blacklisted_name -[`block_in_if_condition_expr`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition_expr -[`block_in_if_condition_stmt`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition_stmt +[`block_in_if_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition [`bool_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison [`borrow_interior_mutable_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_interior_mutable_const [`borrowed_box`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box diff --git a/clippy_lints/src/block_in_if_condition.rs b/clippy_lints/src/block_in_if_condition.rs index 9e533eaa3..8a5e59574 100644 --- a/clippy_lints/src/block_in_if_condition.rs +++ b/clippy_lints/src/block_in_if_condition.rs @@ -8,43 +8,40 @@ use rustc_middle::lint::in_external_macro; use rustc_session::{declare_lint_pass, declare_tool_lint}; declare_clippy_lint! { - /// **What it does:** Checks for `if` conditions that use blocks to contain an - /// expression. + /// **What it does:** Checks for `if` conditions that use blocks containing an + /// expression, statements or conditions that use closures with blocks. /// - /// **Why is this bad?** It isn't really Rust style, same as using parentheses - /// to contain expressions. + /// **Why is this bad?** Style, using blocks in the condition makes it hard to read. /// /// **Known problems:** None. /// - /// **Example:** + /// **Examples:** /// ```rust + /// // Bad /// if { true } { /* ... */ } + /// + /// // Good + /// if true { /* ... */ } /// ``` - pub BLOCK_IN_IF_CONDITION_EXPR, - style, - "braces that can be eliminated in conditions, e.g., `if { true } ...`" -} - -declare_clippy_lint! { - /// **What it does:** Checks for `if` conditions that use blocks containing - /// statements, or conditions that use closures with blocks. /// - /// **Why is this bad?** Using blocks in the condition makes it hard to read. - /// - /// **Known problems:** None. - /// - /// **Example:** - /// ```rust,ignore - /// if { let x = somefunc(); x } {} /// // or - /// if somefunc(|x| { x == 47 }) {} + /// + /// ```rust + /// # fn somefunc() -> bool { true }; + /// + /// // Bad + /// if { let x = somefunc(); x } { /* ... */ } + /// + /// // Good + /// let res = { let x = somefunc(); x }; + /// if res { /* ... */ } /// ``` - pub BLOCK_IN_IF_CONDITION_STMT, + pub BLOCK_IN_IF_CONDITION, style, - "complex blocks in conditions, e.g., `if { let x = true; x } ...`" + "useless or complex blocks that can be eliminated in conditions" } -declare_lint_pass!(BlockInIfCondition => [BLOCK_IN_IF_CONDITION_EXPR, BLOCK_IN_IF_CONDITION_STMT]); +declare_lint_pass!(BlockInIfCondition => [BLOCK_IN_IF_CONDITION]); struct ExVisitor<'a, 'tcx> { found_block: Option<&'tcx Expr<'tcx>>, @@ -72,7 +69,7 @@ impl<'a, 'tcx> Visitor<'tcx> for ExVisitor<'a, 'tcx> { const BRACED_EXPR_MESSAGE: &str = "omit braces around single expression condition"; const COMPLEX_BLOCK_MESSAGE: &str = "in an `if` condition, avoid complex blocks or closures with blocks; \ - instead, move the block or closure higher and bind it with a `let`"; + instead, move the block or closure higher and bind it with a `let`"; impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BlockInIfCondition { fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) { @@ -92,7 +89,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BlockInIfCondition { let mut applicability = Applicability::MachineApplicable; span_lint_and_sugg( cx, - BLOCK_IN_IF_CONDITION_EXPR, + BLOCK_IN_IF_CONDITION, cond.span, BRACED_EXPR_MESSAGE, "try", @@ -118,7 +115,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BlockInIfCondition { let mut applicability = Applicability::MachineApplicable; span_lint_and_sugg( cx, - BLOCK_IN_IF_CONDITION_STMT, + BLOCK_IN_IF_CONDITION, expr.span.with_hi(cond.span.hi()), COMPLEX_BLOCK_MESSAGE, "try", @@ -140,7 +137,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BlockInIfCondition { let mut visitor = ExVisitor { found_block: None, cx }; walk_expr(&mut visitor, cond); if let Some(block) = visitor.found_block { - span_lint(cx, BLOCK_IN_IF_CONDITION_STMT, block.span, COMPLEX_BLOCK_MESSAGE); + span_lint(cx, BLOCK_IN_IF_CONDITION, block.span, COMPLEX_BLOCK_MESSAGE); } } } diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 0c4daeb73..98b696533 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -507,8 +507,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &bit_mask::INEFFECTIVE_BIT_MASK, &bit_mask::VERBOSE_BIT_MASK, &blacklisted_name::BLACKLISTED_NAME, - &block_in_if_condition::BLOCK_IN_IF_CONDITION_EXPR, - &block_in_if_condition::BLOCK_IN_IF_CONDITION_STMT, + &block_in_if_condition::BLOCK_IN_IF_CONDITION, &booleans::LOGIC_BUG, &booleans::NONMINIMAL_BOOL, &bytecount::NAIVE_BYTECOUNT, @@ -1209,8 +1208,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&bit_mask::INEFFECTIVE_BIT_MASK), LintId::of(&bit_mask::VERBOSE_BIT_MASK), LintId::of(&blacklisted_name::BLACKLISTED_NAME), - LintId::of(&block_in_if_condition::BLOCK_IN_IF_CONDITION_EXPR), - LintId::of(&block_in_if_condition::BLOCK_IN_IF_CONDITION_STMT), + LintId::of(&block_in_if_condition::BLOCK_IN_IF_CONDITION), LintId::of(&booleans::LOGIC_BUG), LintId::of(&booleans::NONMINIMAL_BOOL), LintId::of(&bytecount::NAIVE_BYTECOUNT), @@ -1456,8 +1454,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&attrs::UNKNOWN_CLIPPY_LINTS), LintId::of(&bit_mask::VERBOSE_BIT_MASK), LintId::of(&blacklisted_name::BLACKLISTED_NAME), - LintId::of(&block_in_if_condition::BLOCK_IN_IF_CONDITION_EXPR), - LintId::of(&block_in_if_condition::BLOCK_IN_IF_CONDITION_STMT), + LintId::of(&block_in_if_condition::BLOCK_IN_IF_CONDITION), LintId::of(&collapsible_if::COLLAPSIBLE_IF), LintId::of(&comparison_chain::COMPARISON_CHAIN), LintId::of(&doc::MISSING_SAFETY_DOC), diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index e1a6d4bdd..4ae60f7d8 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -74,16 +74,9 @@ pub static ref ALL_LINTS: Vec = vec![ module: "blacklisted_name", }, Lint { - name: "block_in_if_condition_expr", + name: "block_in_if_condition", group: "style", - desc: "braces that can be eliminated in conditions, e.g., `if { true } ...`", - deprecation: None, - module: "block_in_if_condition", - }, - Lint { - name: "block_in_if_condition_stmt", - group: "style", - desc: "complex blocks in conditions, e.g., `if { let x = true; x } ...`", + desc: "useless or complex blocks that can be eliminated in conditions", deprecation: None, module: "block_in_if_condition", }, diff --git a/tests/ui/block_in_if_condition.fixed b/tests/ui/block_in_if_condition.fixed index 955801e40..ae01c6d30 100644 --- a/tests/ui/block_in_if_condition.fixed +++ b/tests/ui/block_in_if_condition.fixed @@ -1,6 +1,5 @@ // run-rustfix -#![warn(clippy::block_in_if_condition_expr)] -#![warn(clippy::block_in_if_condition_stmt)] +#![warn(clippy::block_in_if_condition)] #![allow(unused, clippy::let_and_return)] #![warn(clippy::nonminimal_bool)] diff --git a/tests/ui/block_in_if_condition.rs b/tests/ui/block_in_if_condition.rs index a6ea01d5f..88555dc47 100644 --- a/tests/ui/block_in_if_condition.rs +++ b/tests/ui/block_in_if_condition.rs @@ -1,6 +1,5 @@ // run-rustfix -#![warn(clippy::block_in_if_condition_expr)] -#![warn(clippy::block_in_if_condition_stmt)] +#![warn(clippy::block_in_if_condition)] #![allow(unused, clippy::let_and_return)] #![warn(clippy::nonminimal_bool)] diff --git a/tests/ui/block_in_if_condition.stderr b/tests/ui/block_in_if_condition.stderr index b0a0a276c..89e9ad26f 100644 --- a/tests/ui/block_in_if_condition.stderr +++ b/tests/ui/block_in_if_condition.stderr @@ -1,5 +1,5 @@ error: in an `if` condition, avoid complex blocks or closures with blocks; instead, move the block or closure higher and bind it with a `let` - --> $DIR/block_in_if_condition.rs:27:5 + --> $DIR/block_in_if_condition.rs:26:5 | LL | / if { LL | | let x = 3; @@ -7,7 +7,7 @@ LL | | x == 3 LL | | } { | |_____^ | - = note: `-D clippy::block-in-if-condition-stmt` implied by `-D warnings` + = note: `-D clippy::block-in-if-condition` implied by `-D warnings` help: try | LL | let res = { @@ -17,15 +17,13 @@ LL | }; if res { | error: omit braces around single expression condition - --> $DIR/block_in_if_condition.rs:38:8 + --> $DIR/block_in_if_condition.rs:37:8 | LL | if { true } { | ^^^^^^^^ help: try: `true` - | - = note: `-D clippy::block-in-if-condition-expr` implied by `-D warnings` error: this boolean expression can be simplified - --> $DIR/block_in_if_condition.rs:47:8 + --> $DIR/block_in_if_condition.rs:46:8 | LL | if true && x == 3 { | ^^^^^^^^^^^^^^ help: try: `x == 3` diff --git a/tests/ui/block_in_if_condition_closure.rs b/tests/ui/block_in_if_condition_closure.rs index bac3eda5e..87b3fb94d 100644 --- a/tests/ui/block_in_if_condition_closure.rs +++ b/tests/ui/block_in_if_condition_closure.rs @@ -1,5 +1,4 @@ -#![warn(clippy::block_in_if_condition_expr)] -#![warn(clippy::block_in_if_condition_stmt)] +#![warn(clippy::block_in_if_condition)] #![allow(unused, clippy::let_and_return)] fn predicate bool, T>(pfn: F, val: T) -> bool { @@ -10,7 +9,7 @@ fn pred_test() { let v = 3; let sky = "blue"; // This is a sneaky case, where the block isn't directly in the condition, - // but is actually nside a closure that the condition is using. + // but is actually inside a closure that the condition is using. // The same principle applies -- add some extra expressions to make sure // linter isn't confused by them. if v == 3 diff --git a/tests/ui/block_in_if_condition_closure.stderr b/tests/ui/block_in_if_condition_closure.stderr index 86cd24fe7..3df25691c 100644 --- a/tests/ui/block_in_if_condition_closure.stderr +++ b/tests/ui/block_in_if_condition_closure.stderr @@ -1,5 +1,5 @@ error: in an `if` condition, avoid complex blocks or closures with blocks; instead, move the block or closure higher and bind it with a `let` - --> $DIR/block_in_if_condition_closure.rs:19:17 + --> $DIR/block_in_if_condition_closure.rs:18:17 | LL | |x| { | _________________^ @@ -8,10 +8,10 @@ LL | | x == target LL | | }, | |_____________^ | - = note: `-D clippy::block-in-if-condition-stmt` implied by `-D warnings` + = note: `-D clippy::block-in-if-condition` implied by `-D warnings` error: in an `if` condition, avoid complex blocks or closures with blocks; instead, move the block or closure higher and bind it with a `let` - --> $DIR/block_in_if_condition_closure.rs:28:13 + --> $DIR/block_in_if_condition_closure.rs:27:13 | LL | |x| { | _____________^ From 6cbdd1e49dbb2355ac1036946a5a635e22023c6f Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sun, 3 May 2020 12:28:40 +0200 Subject: [PATCH 0058/4780] Merge `option_map_unwrap_or`, `option_map_unwrap_or_else` and `result_map_unwrap_or_else` lints into `map_unwrap` lint --- CHANGELOG.md | 4 +- clippy_lints/src/lib.rs | 8 +- clippy_lints/src/methods/mod.rs | 94 ++++++------------- .../src/methods/option_map_unwrap_or.rs | 6 +- src/lintlist/mod.rs | 28 ++---- ...{option_map_unwrap_or.rs => map_unwrap.rs} | 23 +++-- ...map_unwrap_or.stderr => map_unwrap.stderr} | 49 +++++++--- tests/ui/result_map_unwrap_or_else.rs | 23 ----- tests/ui/result_map_unwrap_or_else.stderr | 27 ------ 9 files changed, 95 insertions(+), 167 deletions(-) rename tests/ui/{option_map_unwrap_or.rs => map_unwrap.rs} (75%) rename tests/ui/{option_map_unwrap_or.stderr => map_unwrap.stderr} (70%) delete mode 100644 tests/ui/result_map_unwrap_or_else.rs delete mode 100644 tests/ui/result_map_unwrap_or_else.stderr diff --git a/CHANGELOG.md b/CHANGELOG.md index 0b270e6ac..28b05044d 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1430,6 +1430,7 @@ Released 2018-09-13 [`map_clone`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_clone [`map_entry`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_entry [`map_flatten`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_flatten +[`map_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_unwrap [`match_as_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_as_ref [`match_bool`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_bool [`match_on_vec_items`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_on_vec_items @@ -1499,8 +1500,6 @@ Released 2018-09-13 [`option_expect_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_expect_used [`option_map_or_none`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_or_none [`option_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_unit_fn -[`option_map_unwrap_or`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_unwrap_or -[`option_map_unwrap_or_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_unwrap_or_else [`option_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_option [`option_unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_unwrap_used [`or_fun_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#or_fun_call @@ -1542,7 +1541,6 @@ Released 2018-09-13 [`result_expect_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_expect_used [`result_map_or_into_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_or_into_option [`result_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unit_fn -[`result_map_unwrap_or_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unwrap_or_else [`result_unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_unwrap_used [`reversed_empty_ranges`]: https://rust-lang.github.io/rust-clippy/master/index.html#reversed_empty_ranges [`same_functions_in_if_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#same_functions_in_if_condition diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 98b696533..c9a2ef499 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -673,19 +673,17 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &methods::ITER_SKIP_NEXT, &methods::MANUAL_SATURATING_ARITHMETIC, &methods::MAP_FLATTEN, + &methods::MAP_UNWRAP, &methods::NEW_RET_NO_SELF, &methods::OK_EXPECT, &methods::OPTION_AND_THEN_SOME, &methods::OPTION_AS_REF_DEREF, &methods::OPTION_EXPECT_USED, &methods::OPTION_MAP_OR_NONE, - &methods::OPTION_MAP_UNWRAP_OR, - &methods::OPTION_MAP_UNWRAP_OR_ELSE, &methods::OPTION_UNWRAP_USED, &methods::OR_FUN_CALL, &methods::RESULT_EXPECT_USED, &methods::RESULT_MAP_OR_INTO_OPTION, - &methods::RESULT_MAP_UNWRAP_OR_ELSE, &methods::RESULT_UNWRAP_USED, &methods::SEARCH_IS_SOME, &methods::SHOULD_IMPLEMENT_TRAIT, @@ -1152,9 +1150,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&methods::FIND_MAP), LintId::of(&methods::INEFFICIENT_TO_STRING), LintId::of(&methods::MAP_FLATTEN), - LintId::of(&methods::OPTION_MAP_UNWRAP_OR), - LintId::of(&methods::OPTION_MAP_UNWRAP_OR_ELSE), - LintId::of(&methods::RESULT_MAP_UNWRAP_OR_ELSE), + LintId::of(&methods::MAP_UNWRAP), LintId::of(&misc::USED_UNDERSCORE_BINDING), LintId::of(&misc_early::UNSEPARATED_LITERAL_SUFFIX), LintId::of(&mut_mut::MUT_MUT), diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index 3676dc5b0..401298b2d 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -257,59 +257,40 @@ declare_clippy_lint! { } declare_clippy_lint! { - /// **What it does:** Checks for usage of `_.map(_).unwrap_or(_)`. + /// **What it does:** Checks for usage of `option.map(_).unwrap_or(_)` or `option.map(_).unwrap_or_else(_)` or + /// `result.map(_).unwrap_or_else(_)`. /// - /// **Why is this bad?** Readability, this can be written more concisely as - /// `_.map_or(_, _)`. + /// **Why is this bad?** Readability, these can be written more concisely (resp.) as + /// `option.map_or(_, _)`, `option.map_or_else(_, _)` and `result.map_or_else(_, _)`. /// /// **Known problems:** The order of the arguments is not in execution order /// - /// **Example:** + /// **Examples:** /// ```rust /// # let x = Some(1); + /// + /// // Bad /// x.map(|a| a + 1).unwrap_or(0); + /// + /// // Good + /// x.map_or(0, |a| a + 1); /// ``` - pub OPTION_MAP_UNWRAP_OR, - pedantic, - "using `Option.map(f).unwrap_or(a)`, which is more succinctly expressed as `map_or(a, f)`" -} - -declare_clippy_lint! { - /// **What it does:** Checks for usage of `_.map(_).unwrap_or_else(_)`. /// - /// **Why is this bad?** Readability, this can be written more concisely as - /// `_.map_or_else(_, _)`. + /// // or /// - /// **Known problems:** The order of the arguments is not in execution order. - /// - /// **Example:** - /// ```rust - /// # let x = Some(1); - /// # fn some_function() -> usize { 1 } - /// x.map(|a| a + 1).unwrap_or_else(some_function); - /// ``` - pub OPTION_MAP_UNWRAP_OR_ELSE, - pedantic, - "using `Option.map(f).unwrap_or_else(g)`, which is more succinctly expressed as `map_or_else(g, f)`" -} - -declare_clippy_lint! { - /// **What it does:** Checks for usage of `result.map(_).unwrap_or_else(_)`. - /// - /// **Why is this bad?** Readability, this can be written more concisely as - /// `result.map_or_else(_, _)`. - /// - /// **Known problems:** None. - /// - /// **Example:** /// ```rust /// # let x: Result = Ok(1); /// # fn some_function(foo: ()) -> usize { 1 } + /// + /// // Bad /// x.map(|a| a + 1).unwrap_or_else(some_function); + /// + /// // Good + /// x.map_or_else(some_function, |a| a + 1); /// ``` - pub RESULT_MAP_UNWRAP_OR_ELSE, + pub MAP_UNWRAP, pedantic, - "using `Result.map(f).unwrap_or_else(g)`, which is more succinctly expressed as `.map_or_else(g, f)`" + "using `.map(f).unwrap_or(a)` or `.map(f).unwrap_or_else(func)`, which are more succinctly expressed as `map_or(a, f)` or `map_or_else(a, f)`" } declare_clippy_lint! { @@ -1294,9 +1275,7 @@ declare_lint_pass!(Methods => [ WRONG_SELF_CONVENTION, WRONG_PUB_SELF_CONVENTION, OK_EXPECT, - OPTION_MAP_UNWRAP_OR, - OPTION_MAP_UNWRAP_OR_ELSE, - RESULT_MAP_UNWRAP_OR_ELSE, + MAP_UNWRAP, RESULT_MAP_OR_INTO_OPTION, OPTION_MAP_OR_NONE, OPTION_AND_THEN_SOME, @@ -1503,9 +1482,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Methods { cx, lint, first_arg.pat.span, - &format!( - "methods called `{}` usually take {}; consider choosing a less \ - ambiguous name", + &format!("methods called `{}` usually take {}; consider choosing a less ambiguous name", conv, &self_kinds .iter() @@ -1678,7 +1655,7 @@ fn lint_or_fun_call<'a, 'tcx>( let self_ty = cx.tables.expr_ty(self_expr); if let Some(&(_, fn_has_arguments, poss, suffix)) = - know_types.iter().find(|&&i| match_type(cx, self_ty, i.0)); + know_types.iter().find(|&&i| match_type(cx, self_ty, i.0)); if poss.contains(&name); @@ -1931,7 +1908,7 @@ fn lint_clone_on_copy(cx: &LateContext<'_, '_>, expr: &hir::Expr<'_>, arg: &hir: CLONE_DOUBLE_REF, expr.span, "using `clone` on a double-reference; \ - this will copy the reference instead of cloning the inner type", + this will copy the reference instead of cloning the inner type", |diag| { if let Some(snip) = sugg::Sugg::hir_opt(cx, arg) { let mut ty = innermost; @@ -2121,7 +2098,7 @@ fn lint_iter_cloned_collect<'a, 'tcx>( ITER_CLONED_COLLECT, to_replace, "called `iter().cloned().collect()` on a slice to create a `Vec`. Calling `to_vec()` is both faster and \ - more readable", + more readable", "try", ".to_vec()".to_string(), Applicability::MachineApplicable, @@ -2436,7 +2413,7 @@ fn lint_unwrap(cx: &LateContext<'_, '_>, expr: &hir::Expr<'_>, unwrap_args: &[hi None, &format!( "if you don't want to handle the `{}` case gracefully, consider \ - using `expect()` to provide a better panic message", + using `expect()` to provide a better panic message", none_value, ), ); @@ -2494,7 +2471,7 @@ fn lint_map_flatten<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr< // lint if caller of `.map().flatten()` is an Iterator if match_trait_method(cx, expr, &paths::ITERATOR) { let msg = "called `map(..).flatten()` on an `Iterator`. \ - This is more succinctly expressed by calling `.flat_map(..)`"; + This is more succinctly expressed by calling `.flat_map(..)`"; let self_snippet = snippet(cx, map_args[0].span, ".."); let func_snippet = snippet(cx, map_args[1].span, ".."); let hint = format!("{0}.flat_map({1})", self_snippet, func_snippet); @@ -2555,10 +2532,10 @@ fn lint_map_unwrap_or_else<'a, 'tcx>( // lint message let msg = if is_option { "called `map(f).unwrap_or_else(g)` on an `Option` value. This can be done more directly by calling \ - `map_or_else(g, f)` instead" + `map_or_else(g, f)` instead" } else { "called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling \ - `.map_or_else(g, f)` instead" + `.map_or_else(g, f)` instead" }; // get snippets for args to map() and unwrap_or_else() let map_snippet = snippet(cx, map_args[1].span, ".."); @@ -2570,11 +2547,7 @@ fn lint_map_unwrap_or_else<'a, 'tcx>( if same_span && !multiline { span_lint_and_note( cx, - if is_option { - OPTION_MAP_UNWRAP_OR_ELSE - } else { - RESULT_MAP_UNWRAP_OR_ELSE - }, + MAP_UNWRAP, expr.span, msg, None, @@ -2584,16 +2557,7 @@ fn lint_map_unwrap_or_else<'a, 'tcx>( ), ); } else if same_span && multiline { - span_lint( - cx, - if is_option { - OPTION_MAP_UNWRAP_OR_ELSE - } else { - RESULT_MAP_UNWRAP_OR_ELSE - }, - expr.span, - msg, - ); + span_lint(cx, MAP_UNWRAP, expr.span, msg); }; } } diff --git a/clippy_lints/src/methods/option_map_unwrap_or.rs b/clippy_lints/src/methods/option_map_unwrap_or.rs index bf9dd3c93..fcaa9b47e 100644 --- a/clippy_lints/src/methods/option_map_unwrap_or.rs +++ b/clippy_lints/src/methods/option_map_unwrap_or.rs @@ -9,7 +9,7 @@ use rustc_middle::hir::map::Map; use rustc_span::source_map::Span; use rustc_span::symbol::Symbol; -use super::OPTION_MAP_UNWRAP_OR; +use super::MAP_UNWRAP; /// lint use of `map().unwrap_or()` for `Option`s pub(super) fn lint<'a, 'tcx>( @@ -62,11 +62,11 @@ pub(super) fn lint<'a, 'tcx>( }; let msg = &format!( "called `map(f).unwrap_or({})` on an `Option` value. \ - This can be done more directly by calling `{}` instead", + This can be done more directly by calling `{}` instead", arg, suggest ); - span_lint_and_then(cx, OPTION_MAP_UNWRAP_OR, expr.span, msg, |diag| { + span_lint_and_then(cx, MAP_UNWRAP, expr.span, msg, |diag| { let map_arg_span = map_args[1].span; let mut suggestion = vec![ diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 4ae60f7d8..d3bd9f66e 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1137,6 +1137,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "methods", }, + Lint { + name: "map_unwrap", + group: "pedantic", + desc: "using `.map(f).unwrap_or(a)` or `.map(f).unwrap_or_else(func)`, which are more succinctly expressed as `map_or(a, f)` or `map_or_else(a, f)`", + deprecation: None, + module: "methods", + }, Lint { name: "match_as_ref", group: "complexity", @@ -1613,20 +1620,6 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "map_unit_fn", }, - Lint { - name: "option_map_unwrap_or", - group: "pedantic", - desc: "using `Option.map(f).unwrap_or(a)`, which is more succinctly expressed as `map_or(a, f)`", - deprecation: None, - module: "methods", - }, - Lint { - name: "option_map_unwrap_or_else", - group: "pedantic", - desc: "using `Option.map(f).unwrap_or_else(g)`, which is more succinctly expressed as `map_or_else(g, f)`", - deprecation: None, - module: "methods", - }, Lint { name: "option_option", group: "pedantic", @@ -1900,13 +1893,6 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "map_unit_fn", }, - Lint { - name: "result_map_unwrap_or_else", - group: "pedantic", - desc: "using `Result.map(f).unwrap_or_else(g)`, which is more succinctly expressed as `.map_or_else(g, f)`", - deprecation: None, - module: "methods", - }, Lint { name: "result_unwrap_used", group: "restriction", diff --git a/tests/ui/option_map_unwrap_or.rs b/tests/ui/map_unwrap.rs similarity index 75% rename from tests/ui/option_map_unwrap_or.rs rename to tests/ui/map_unwrap.rs index 0364d8366..53e503682 100644 --- a/tests/ui/option_map_unwrap_or.rs +++ b/tests/ui/map_unwrap.rs @@ -1,21 +1,18 @@ // FIXME: Add "run-rustfix" once it's supported for multipart suggestions // aux-build:option_helpers.rs -#![warn(clippy::option_map_unwrap_or, clippy::option_map_unwrap_or_else)] +#![warn(clippy::map_unwrap)] #[macro_use] extern crate option_helpers; use std::collections::HashMap; -/// Checks implementation of the following lints: -/// * `OPTION_MAP_UNWRAP_OR` -/// * `OPTION_MAP_UNWRAP_OR_ELSE` #[rustfmt::skip] fn option_methods() { let opt = Some(1); - // Check `OPTION_MAP_UNWRAP_OR`. + // Check for `option.map(_).unwrap_or(_)` use. // Single line case. let _ = opt.map(|x| x + 1) // Should lint even though this call is on a separate line. @@ -49,7 +46,7 @@ fn option_methods() { let id: String = "identifier".to_string(); let _ = Some("prefix").map(|p| format!("{}.", p)).unwrap_or(id); - // Check OPTION_MAP_UNWRAP_OR_ELSE + // Check for `option.map(_).unwrap_or_else(_)` use. // single line case let _ = opt.map(|x| x + 1) // Should lint even though this call is on a separate line. @@ -83,6 +80,20 @@ fn option_methods() { } } +fn result_methods() { + let res: Result = Ok(1); + + // Check for `result.map(_).unwrap_or_else(_)` use. + // single line case + let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); // should lint even though this call is on a separate line + // multi line cases + let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); + let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); + // macro case + let _ = opt_map!(res, |x| x + 1).unwrap_or_else(|e| 0); // should not lint +} + fn main() { option_methods(); + result_methods(); } diff --git a/tests/ui/option_map_unwrap_or.stderr b/tests/ui/map_unwrap.stderr similarity index 70% rename from tests/ui/option_map_unwrap_or.stderr rename to tests/ui/map_unwrap.stderr index f05f2893d..261092327 100644 --- a/tests/ui/option_map_unwrap_or.stderr +++ b/tests/ui/map_unwrap.stderr @@ -1,5 +1,5 @@ error: called `map(f).unwrap_or(a)` on an `Option` value. This can be done more directly by calling `map_or(a, f)` instead - --> $DIR/option_map_unwrap_or.rs:20:13 + --> $DIR/map_unwrap.rs:17:13 | LL | let _ = opt.map(|x| x + 1) | _____________^ @@ -7,14 +7,14 @@ LL | | // Should lint even though this call is on a separate line. LL | | .unwrap_or(0); | |_____________________^ | - = note: `-D clippy::option-map-unwrap-or` implied by `-D warnings` + = note: `-D clippy::map-unwrap` implied by `-D warnings` help: use `map_or(a, f)` instead | LL | let _ = opt.map_or(0, |x| x + 1); | ^^^^^^ ^^ -- error: called `map(f).unwrap_or(a)` on an `Option` value. This can be done more directly by calling `map_or(a, f)` instead - --> $DIR/option_map_unwrap_or.rs:24:13 + --> $DIR/map_unwrap.rs:21:13 | LL | let _ = opt.map(|x| { | _____________^ @@ -32,7 +32,7 @@ LL | ); | error: called `map(f).unwrap_or(a)` on an `Option` value. This can be done more directly by calling `map_or(a, f)` instead - --> $DIR/option_map_unwrap_or.rs:28:13 + --> $DIR/map_unwrap.rs:25:13 | LL | let _ = opt.map(|x| x + 1) | _____________^ @@ -49,7 +49,7 @@ LL | }, |x| x + 1); | error: called `map(f).unwrap_or(None)` on an `Option` value. This can be done more directly by calling `and_then(f)` instead - --> $DIR/option_map_unwrap_or.rs:33:13 + --> $DIR/map_unwrap.rs:30:13 | LL | let _ = opt.map(|x| Some(x + 1)).unwrap_or(None); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -60,7 +60,7 @@ LL | let _ = opt.and_then(|x| Some(x + 1)); | ^^^^^^^^ -- error: called `map(f).unwrap_or(None)` on an `Option` value. This can be done more directly by calling `and_then(f)` instead - --> $DIR/option_map_unwrap_or.rs:35:13 + --> $DIR/map_unwrap.rs:32:13 | LL | let _ = opt.map(|x| { | _____________^ @@ -78,7 +78,7 @@ LL | ); | error: called `map(f).unwrap_or(None)` on an `Option` value. This can be done more directly by calling `and_then(f)` instead - --> $DIR/option_map_unwrap_or.rs:39:13 + --> $DIR/map_unwrap.rs:36:13 | LL | let _ = opt | _____________^ @@ -92,7 +92,7 @@ LL | .and_then(|x| Some(x + 1)); | ^^^^^^^^ -- error: called `map(f).unwrap_or(a)` on an `Option` value. This can be done more directly by calling `map_or(a, f)` instead - --> $DIR/option_map_unwrap_or.rs:50:13 + --> $DIR/map_unwrap.rs:47:13 | LL | let _ = Some("prefix").map(|p| format!("{}.", p)).unwrap_or(id); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -103,7 +103,7 @@ LL | let _ = Some("prefix").map_or(id, |p| format!("{}.", p)); | ^^^^^^ ^^^ -- error: called `map(f).unwrap_or_else(g)` on an `Option` value. This can be done more directly by calling `map_or_else(g, f)` instead - --> $DIR/option_map_unwrap_or.rs:54:13 + --> $DIR/map_unwrap.rs:51:13 | LL | let _ = opt.map(|x| x + 1) | _____________^ @@ -111,11 +111,10 @@ LL | | // Should lint even though this call is on a separate line. LL | | .unwrap_or_else(|| 0); | |_____________________________^ | - = note: `-D clippy::option-map-unwrap-or-else` implied by `-D warnings` = note: replace `map(|x| x + 1).unwrap_or_else(|| 0)` with `map_or_else(|| 0, |x| x + 1)` error: called `map(f).unwrap_or_else(g)` on an `Option` value. This can be done more directly by calling `map_or_else(g, f)` instead - --> $DIR/option_map_unwrap_or.rs:58:13 + --> $DIR/map_unwrap.rs:55:13 | LL | let _ = opt.map(|x| { | _____________^ @@ -125,7 +124,7 @@ LL | | ).unwrap_or_else(|| 0); | |__________________________^ error: called `map(f).unwrap_or_else(g)` on an `Option` value. This can be done more directly by calling `map_or_else(g, f)` instead - --> $DIR/option_map_unwrap_or.rs:62:13 + --> $DIR/map_unwrap.rs:59:13 | LL | let _ = opt.map(|x| x + 1) | _____________^ @@ -134,5 +133,29 @@ LL | | 0 LL | | ); | |_________^ -error: aborting due to 10 previous errors +error: called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling `.map_or_else(g, f)` instead + --> $DIR/map_unwrap.rs:88:13 + | +LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); // should lint even though this call is on a separate line + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = note: replace `map(|x| x + 1).unwrap_or_else(|e| 0)` with `map_or_else(|e| 0, |x| x + 1)` + +error: called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling `.map_or_else(g, f)` instead + --> $DIR/map_unwrap.rs:90:13 + | +LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = note: replace `map(|x| x + 1).unwrap_or_else(|e| 0)` with `map_or_else(|e| 0, |x| x + 1)` + +error: called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling `.map_or_else(g, f)` instead + --> $DIR/map_unwrap.rs:91:13 + | +LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = note: replace `map(|x| x + 1).unwrap_or_else(|e| 0)` with `map_or_else(|e| 0, |x| x + 1)` + +error: aborting due to 13 previous errors diff --git a/tests/ui/result_map_unwrap_or_else.rs b/tests/ui/result_map_unwrap_or_else.rs deleted file mode 100644 index 40751bfeb..000000000 --- a/tests/ui/result_map_unwrap_or_else.rs +++ /dev/null @@ -1,23 +0,0 @@ -// aux-build:option_helpers.rs - -//! Checks implementation of `RESULT_MAP_UNWRAP_OR_ELSE` - -#![warn(clippy::result_map_unwrap_or_else)] - -#[macro_use] -extern crate option_helpers; - -fn result_methods() { - let res: Result = Ok(1); - - // Check RESULT_MAP_UNWRAP_OR_ELSE - // single line case - let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); // should lint even though this call is on a separate line - // multi line cases - let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); - let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); - // macro case - let _ = opt_map!(res, |x| x + 1).unwrap_or_else(|e| 0); // should not lint -} - -fn main() {} diff --git a/tests/ui/result_map_unwrap_or_else.stderr b/tests/ui/result_map_unwrap_or_else.stderr deleted file mode 100644 index ec7bc8f12..000000000 --- a/tests/ui/result_map_unwrap_or_else.stderr +++ /dev/null @@ -1,27 +0,0 @@ -error: called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling `.map_or_else(g, f)` instead - --> $DIR/result_map_unwrap_or_else.rs:15:13 - | -LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); // should lint even though this call is on a separate line - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = note: `-D clippy::result-map-unwrap-or-else` implied by `-D warnings` - = note: replace `map(|x| x + 1).unwrap_or_else(|e| 0)` with `map_or_else(|e| 0, |x| x + 1)` - -error: called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling `.map_or_else(g, f)` instead - --> $DIR/result_map_unwrap_or_else.rs:17:13 - | -LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = note: replace `map(|x| x + 1).unwrap_or_else(|e| 0)` with `map_or_else(|e| 0, |x| x + 1)` - -error: called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling `.map_or_else(g, f)` instead - --> $DIR/result_map_unwrap_or_else.rs:18:13 - | -LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = note: replace `map(|x| x + 1).unwrap_or_else(|e| 0)` with `map_or_else(|e| 0, |x| x + 1)` - -error: aborting due to 3 previous errors - From bcf61666bd903c0d13c081cf222b423e45cd854e Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sun, 3 May 2020 13:11:18 +0200 Subject: [PATCH 0059/4780] Merge `option_unwrap_used` and `result_unwrap_used` lints into `unwrap_used` lint --- CHANGELOG.md | 2 +- clippy_lints/src/lib.rs | 6 +-- clippy_lints/src/methods/mod.rs | 68 ++++++++++++--------------------- src/lintlist/mod.rs | 14 +++---- tests/ui/unwrap.rs | 2 +- tests/ui/unwrap.stderr | 3 +- 6 files changed, 37 insertions(+), 58 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index 28b05044d..78f98bba2 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1501,7 +1501,6 @@ Released 2018-09-13 [`option_map_or_none`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_or_none [`option_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_unit_fn [`option_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_option -[`option_unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_unwrap_used [`or_fun_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#or_fun_call [`out_of_bounds_indexing`]: https://rust-lang.github.io/rust-clippy/master/index.html#out_of_bounds_indexing [`overflow_check_conditional`]: https://rust-lang.github.io/rust-clippy/master/index.html#overflow_check_conditional @@ -1622,6 +1621,7 @@ Released 2018-09-13 [`unused_label`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_label [`unused_self`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_self [`unused_unit`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit +[`unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_used [`use_debug`]: https://rust-lang.github.io/rust-clippy/master/index.html#use_debug [`use_self`]: https://rust-lang.github.io/rust-clippy/master/index.html#use_self [`used_underscore_binding`]: https://rust-lang.github.io/rust-clippy/master/index.html#used_underscore_binding diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index c9a2ef499..bb3bc0b45 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -680,11 +680,9 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &methods::OPTION_AS_REF_DEREF, &methods::OPTION_EXPECT_USED, &methods::OPTION_MAP_OR_NONE, - &methods::OPTION_UNWRAP_USED, &methods::OR_FUN_CALL, &methods::RESULT_EXPECT_USED, &methods::RESULT_MAP_OR_INTO_OPTION, - &methods::RESULT_UNWRAP_USED, &methods::SEARCH_IS_SOME, &methods::SHOULD_IMPLEMENT_TRAIT, &methods::SINGLE_CHAR_PATTERN, @@ -695,6 +693,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &methods::UNINIT_ASSUMED_INIT, &methods::UNNECESSARY_FILTER_MAP, &methods::UNNECESSARY_FOLD, + &methods::UNWRAP_USED, &methods::USELESS_ASREF, &methods::WRONG_PUB_SELF_CONVENTION, &methods::WRONG_SELF_CONVENTION, @@ -1090,9 +1089,8 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&methods::FILETYPE_IS_FILE), LintId::of(&methods::GET_UNWRAP), LintId::of(&methods::OPTION_EXPECT_USED), - LintId::of(&methods::OPTION_UNWRAP_USED), LintId::of(&methods::RESULT_EXPECT_USED), - LintId::of(&methods::RESULT_UNWRAP_USED), + LintId::of(&methods::UNWRAP_USED), LintId::of(&methods::WRONG_PUB_SELF_CONVENTION), LintId::of(&misc::FLOAT_CMP_CONST), LintId::of(&misc_early::UNNEEDED_FIELD_PATTERN), diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index 401298b2d..1af4d03c7 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -33,40 +33,15 @@ use crate::utils::{ }; declare_clippy_lint! { - /// **What it does:** Checks for `.unwrap()` calls on `Option`s. + /// **What it does:** Checks for `.unwrap()` calls on `Option`s and on `Result`s. /// - /// **Why is this bad?** Usually it is better to handle the `None` case, or to - /// at least call `.expect(_)` with a more helpful message. Still, for a lot of + /// **Why is this bad?** It is better to handle the `None` or `Err` case, + /// or at least call `.expect(_)` with a more helpful message. Still, for a lot of /// quick-and-dirty code, `unwrap` is a good choice, which is why this lint is /// `Allow` by default. /// - /// **Known problems:** None. - /// - /// **Example:** - /// - /// Using unwrap on an `Option`: - /// - /// ```rust - /// let opt = Some(1); - /// opt.unwrap(); - /// ``` - /// - /// Better: - /// - /// ```rust - /// let opt = Some(1); - /// opt.expect("more helpful message"); - /// ``` - pub OPTION_UNWRAP_USED, - restriction, - "using `Option.unwrap()`, which should at least get a better message using `expect()`" -} - -declare_clippy_lint! { - /// **What it does:** Checks for `.unwrap()` calls on `Result`s. - /// - /// **Why is this bad?** `result.unwrap()` will let the thread panic on `Err` - /// values. Normally, you want to implement more sophisticated error handling, + /// `result.unwrap()` will let the thread panic on `Err` values. + /// Normally, you want to implement more sophisticated error handling, /// and propagate errors upwards with `?` operator. /// /// Even if you want to panic on errors, not all `Error`s implement good @@ -75,23 +50,31 @@ declare_clippy_lint! { /// /// **Known problems:** None. /// - /// **Example:** - /// Using unwrap on an `Result`: - /// + /// **Examples:** /// ```rust - /// let res: Result = Ok(1); - /// res.unwrap(); + /// # let opt = Some(1); + /// + /// // Bad + /// opt.unwrap(); + /// + /// // Good + /// opt.expect("more helpful message"); /// ``` /// - /// Better: + /// // or /// /// ```rust - /// let res: Result = Ok(1); + /// # let res: Result = Ok(1); + /// + /// // Bad + /// res.unwrap(); + /// + /// // Good /// res.expect("more helpful message"); /// ``` - pub RESULT_UNWRAP_USED, + pub UNWRAP_USED, restriction, - "using `Result.unwrap()`, which might be better handled" + "using `.unwrap()` on `Result` or `Option`, which should at least get a better message using `expect()`" } declare_clippy_lint! { @@ -1267,8 +1250,7 @@ declare_clippy_lint! { } declare_lint_pass!(Methods => [ - OPTION_UNWRAP_USED, - RESULT_UNWRAP_USED, + UNWRAP_USED, OPTION_EXPECT_USED, RESULT_EXPECT_USED, SHOULD_IMPLEMENT_TRAIT, @@ -2397,9 +2379,9 @@ fn lint_unwrap(cx: &LateContext<'_, '_>, expr: &hir::Expr<'_>, unwrap_args: &[hi let obj_ty = walk_ptrs_ty(cx.tables.expr_ty(&unwrap_args[0])); let mess = if is_type_diagnostic_item(cx, obj_ty, sym!(option_type)) { - Some((OPTION_UNWRAP_USED, "an Option", "None")) + Some((UNWRAP_USED, "an Option", "None")) } else if is_type_diagnostic_item(cx, obj_ty, sym!(result_type)) { - Some((RESULT_UNWRAP_USED, "a Result", "Err")) + Some((UNWRAP_USED, "a Result", "Err")) } else { None }; diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index d3bd9f66e..5cbf3ef02 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1627,13 +1627,6 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "types", }, - Lint { - name: "option_unwrap_used", - group: "restriction", - desc: "using `Option.unwrap()`, which should at least get a better message using `expect()`", - deprecation: None, - module: "methods", - }, Lint { name: "or_fun_call", group: "perf", @@ -2404,6 +2397,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "returns", }, + Lint { + name: "unwrap_used", + group: "restriction", + desc: "using `.unwrap()` on `Result` or `Option`, which should at least get a better message using `expect()`", + deprecation: None, + module: "methods", + }, Lint { name: "use_debug", group: "restriction", diff --git a/tests/ui/unwrap.rs b/tests/ui/unwrap.rs index fcd1fcd14..a4a3cd1d3 100644 --- a/tests/ui/unwrap.rs +++ b/tests/ui/unwrap.rs @@ -1,4 +1,4 @@ -#![warn(clippy::option_unwrap_used, clippy::result_unwrap_used)] +#![warn(clippy::unwrap_used)] fn unwrap_option() { let opt = Some(0); diff --git a/tests/ui/unwrap.stderr b/tests/ui/unwrap.stderr index b90ce68fa..4f0858005 100644 --- a/tests/ui/unwrap.stderr +++ b/tests/ui/unwrap.stderr @@ -4,7 +4,7 @@ error: used `unwrap()` on `an Option` value LL | let _ = opt.unwrap(); | ^^^^^^^^^^^^ | - = note: `-D clippy::option-unwrap-used` implied by `-D warnings` + = note: `-D clippy::unwrap-used` implied by `-D warnings` = help: if you don't want to handle the `None` case gracefully, consider using `expect()` to provide a better panic message error: used `unwrap()` on `a Result` value @@ -13,7 +13,6 @@ error: used `unwrap()` on `a Result` value LL | let _ = res.unwrap(); | ^^^^^^^^^^^^ | - = note: `-D clippy::result-unwrap-used` implied by `-D warnings` = help: if you don't want to handle the `Err` case gracefully, consider using `expect()` to provide a better panic message error: aborting due to 2 previous errors From 0e8be599cd04a8566224c63eeb07f5fa04605702 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sun, 3 May 2020 13:32:17 +0200 Subject: [PATCH 0060/4780] Merge `option_expect_used` and `result_expect_used` lints into `expect_used` lint --- CHANGELOG.md | 3 +- clippy_lints/src/lib.rs | 6 +-- clippy_lints/src/methods/mod.rs | 69 +++++++++++++-------------------- src/lintlist/mod.rs | 21 ++++------ tests/ui/expect.rs | 2 +- tests/ui/expect.stderr | 3 +- 6 files changed, 38 insertions(+), 66 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index 78f98bba2..4eeb71fa5 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1337,6 +1337,7 @@ Released 2018-09-13 [`excessive_precision`]: https://rust-lang.github.io/rust-clippy/master/index.html#excessive_precision [`exit`]: https://rust-lang.github.io/rust-clippy/master/index.html#exit [`expect_fun_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#expect_fun_call +[`expect_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#expect_used [`expl_impl_clone_on_copy`]: https://rust-lang.github.io/rust-clippy/master/index.html#expl_impl_clone_on_copy [`explicit_counter_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#explicit_counter_loop [`explicit_deref_methods`]: https://rust-lang.github.io/rust-clippy/master/index.html#explicit_deref_methods @@ -1497,7 +1498,6 @@ Released 2018-09-13 [`option_and_then_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_and_then_some [`option_as_ref_deref`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_as_ref_deref [`option_env_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_env_unwrap -[`option_expect_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_expect_used [`option_map_or_none`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_or_none [`option_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_unit_fn [`option_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_option @@ -1537,7 +1537,6 @@ Released 2018-09-13 [`regex_macro`]: https://rust-lang.github.io/rust-clippy/master/index.html#regex_macro [`replace_consts`]: https://rust-lang.github.io/rust-clippy/master/index.html#replace_consts [`rest_pat_in_fully_bound_structs`]: https://rust-lang.github.io/rust-clippy/master/index.html#rest_pat_in_fully_bound_structs -[`result_expect_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_expect_used [`result_map_or_into_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_or_into_option [`result_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unit_fn [`result_unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_unwrap_used diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index bb3bc0b45..eaef1f543 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -657,6 +657,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &methods::CLONE_ON_COPY, &methods::CLONE_ON_REF_PTR, &methods::EXPECT_FUN_CALL, + &methods::EXPECT_USED, &methods::FILETYPE_IS_FILE, &methods::FILTER_MAP, &methods::FILTER_MAP_NEXT, @@ -678,10 +679,8 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &methods::OK_EXPECT, &methods::OPTION_AND_THEN_SOME, &methods::OPTION_AS_REF_DEREF, - &methods::OPTION_EXPECT_USED, &methods::OPTION_MAP_OR_NONE, &methods::OR_FUN_CALL, - &methods::RESULT_EXPECT_USED, &methods::RESULT_MAP_OR_INTO_OPTION, &methods::SEARCH_IS_SOME, &methods::SHOULD_IMPLEMENT_TRAIT, @@ -1086,10 +1085,9 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&matches::WILDCARD_ENUM_MATCH_ARM), LintId::of(&mem_forget::MEM_FORGET), LintId::of(&methods::CLONE_ON_REF_PTR), + LintId::of(&methods::EXPECT_USED), LintId::of(&methods::FILETYPE_IS_FILE), LintId::of(&methods::GET_UNWRAP), - LintId::of(&methods::OPTION_EXPECT_USED), - LintId::of(&methods::RESULT_EXPECT_USED), LintId::of(&methods::UNWRAP_USED), LintId::of(&methods::WRONG_PUB_SELF_CONVENTION), LintId::of(&misc::FLOAT_CMP_CONST), diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index 1af4d03c7..2e75de019 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -78,61 +78,45 @@ declare_clippy_lint! { } declare_clippy_lint! { - /// **What it does:** Checks for `.expect()` calls on `Option`s. + /// **What it does:** Checks for `.expect()` calls on `Option`s and `Result`s. /// - /// **Why is this bad?** Usually it is better to handle the `None` case. Still, - /// for a lot of quick-and-dirty code, `expect` is a good choice, which is why - /// this lint is `Allow` by default. + /// **Why is this bad?** Usually it is better to handle the `None` or `Err` case. + /// Still, for a lot of quick-and-dirty code, `expect` is a good choice, which is why + /// this lint is `Allow` by default. /// - /// **Known problems:** None. - /// - /// **Example:** - /// - /// Using expect on an `Option`: - /// - /// ```rust - /// let opt = Some(1); - /// opt.expect("one"); - /// ``` - /// - /// Better: - /// - /// ```rust,ignore - /// let opt = Some(1); - /// opt?; - /// ``` - pub OPTION_EXPECT_USED, - restriction, - "using `Option.expect()`, which might be better handled" -} - -declare_clippy_lint! { - /// **What it does:** Checks for `.expect()` calls on `Result`s. - /// - /// **Why is this bad?** `result.expect()` will let the thread panic on `Err` + /// `result.expect()` will let the thread panic on `Err` /// values. Normally, you want to implement more sophisticated error handling, /// and propagate errors upwards with `?` operator. /// /// **Known problems:** None. /// - /// **Example:** - /// Using expect on an `Result`: + /// **Examples:** + /// ```rust,ignore + /// # let opt = Some(1); /// - /// ```rust - /// let res: Result = Ok(1); - /// res.expect("one"); + /// // Bad + /// opt.expect("one"); + /// + /// // Good + /// let opt = Some(1); + /// opt?; /// ``` /// - /// Better: + /// // or /// /// ```rust - /// let res: Result = Ok(1); + /// # let res: Result = Ok(1); + /// + /// // Bad + /// res.expect("one"); + /// + /// // Good /// res?; /// # Ok::<(), ()>(()) /// ``` - pub RESULT_EXPECT_USED, + pub EXPECT_USED, restriction, - "using `Result.expect()`, which might be better handled" + "using `.expect()` on `Result` or `Option`, which might be better handled" } declare_clippy_lint! { @@ -1251,8 +1235,7 @@ declare_clippy_lint! { declare_lint_pass!(Methods => [ UNWRAP_USED, - OPTION_EXPECT_USED, - RESULT_EXPECT_USED, + EXPECT_USED, SHOULD_IMPLEMENT_TRAIT, WRONG_SELF_CONVENTION, WRONG_PUB_SELF_CONVENTION, @@ -2407,9 +2390,9 @@ fn lint_expect(cx: &LateContext<'_, '_>, expr: &hir::Expr<'_>, expect_args: &[hi let obj_ty = walk_ptrs_ty(cx.tables.expr_ty(&expect_args[0])); let mess = if is_type_diagnostic_item(cx, obj_ty, sym!(option_type)) { - Some((OPTION_EXPECT_USED, "an Option", "None")) + Some((EXPECT_USED, "an Option", "None")) } else if is_type_diagnostic_item(cx, obj_ty, sym!(result_type)) { - Some((RESULT_EXPECT_USED, "a Result", "Err")) + Some((EXPECT_USED, "a Result", "Err")) } else { None }; diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 5cbf3ef02..4e79ce96b 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -514,6 +514,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "methods", }, + Lint { + name: "expect_used", + group: "restriction", + desc: "using `.expect()` on `Result` or `Option`, which might be better handled", + deprecation: None, + module: "methods", + }, Lint { name: "expl_impl_clone_on_copy", group: "pedantic", @@ -1599,13 +1606,6 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "option_env_unwrap", }, - Lint { - name: "option_expect_used", - group: "restriction", - desc: "using `Option.expect()`, which might be better handled", - deprecation: None, - module: "methods", - }, Lint { name: "option_map_or_none", group: "style", @@ -1865,13 +1865,6 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "matches", }, - Lint { - name: "result_expect_used", - group: "restriction", - desc: "using `Result.expect()`, which might be better handled", - deprecation: None, - module: "methods", - }, Lint { name: "result_map_or_into_option", group: "style", diff --git a/tests/ui/expect.rs b/tests/ui/expect.rs index 0bd4252c4..1073acf6f 100644 --- a/tests/ui/expect.rs +++ b/tests/ui/expect.rs @@ -1,4 +1,4 @@ -#![warn(clippy::option_expect_used, clippy::result_expect_used)] +#![warn(clippy::expect_used)] fn expect_option() { let opt = Some(0); diff --git a/tests/ui/expect.stderr b/tests/ui/expect.stderr index adf9f4f19..9d3fc7df1 100644 --- a/tests/ui/expect.stderr +++ b/tests/ui/expect.stderr @@ -4,7 +4,7 @@ error: used `expect()` on `an Option` value LL | let _ = opt.expect(""); | ^^^^^^^^^^^^^^ | - = note: `-D clippy::option-expect-used` implied by `-D warnings` + = note: `-D clippy::expect-used` implied by `-D warnings` = help: if this value is an `None`, it will panic error: used `expect()` on `a Result` value @@ -13,7 +13,6 @@ error: used `expect()` on `a Result` value LL | let _ = res.expect(""); | ^^^^^^^^^^^^^^ | - = note: `-D clippy::result-expect-used` implied by `-D warnings` = help: if this value is an `Err`, it will panic error: aborting due to 2 previous errors From adbdf7549c6b24c37629eabdc4be0346e0c8fd56 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sun, 3 May 2020 15:16:00 +0200 Subject: [PATCH 0061/4780] Merge `for_loop_over_option` and `for_loop_over_result` lints into `for_loop_over_fallible` lint --- CHANGELOG.md | 3 +- clippy_lints/src/lib.rs | 9 +-- clippy_lints/src/loops.rs | 76 ++++++++----------- src/lintlist/mod.rs | 11 +-- ...on_result.rs => for_loop_over_fallible.rs} | 10 +-- ...t.stderr => for_loop_over_fallible.stderr} | 19 +++-- 6 files changed, 52 insertions(+), 76 deletions(-) rename tests/ui/{for_loop_over_option_result.rs => for_loop_over_fallible.rs} (81%) rename tests/ui/{for_loop_over_option_result.stderr => for_loop_over_fallible.stderr} (81%) diff --git a/CHANGELOG.md b/CHANGELOG.md index 4eeb71fa5..3f9486e09 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1361,8 +1361,7 @@ Released 2018-09-13 [`fn_to_numeric_cast`]: https://rust-lang.github.io/rust-clippy/master/index.html#fn_to_numeric_cast [`fn_to_numeric_cast_with_truncation`]: https://rust-lang.github.io/rust-clippy/master/index.html#fn_to_numeric_cast_with_truncation [`for_kv_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#for_kv_map -[`for_loop_over_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#for_loop_over_option -[`for_loop_over_result`]: https://rust-lang.github.io/rust-clippy/master/index.html#for_loop_over_result +[`for_loop_over_fallible`]: https://rust-lang.github.io/rust-clippy/master/index.html#for_loop_over_fallible [`forget_copy`]: https://rust-lang.github.io/rust-clippy/master/index.html#forget_copy [`forget_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#forget_ref [`future_not_send`]: https://rust-lang.github.io/rust-clippy/master/index.html#future_not_send diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index eaef1f543..8de94d19d 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -615,8 +615,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &loops::EXPLICIT_INTO_ITER_LOOP, &loops::EXPLICIT_ITER_LOOP, &loops::FOR_KV_MAP, - &loops::FOR_LOOP_OVER_OPTION, - &loops::FOR_LOOP_OVER_RESULT, + &loops::FOR_LOOP_OVER_FALLIBLE, &loops::ITER_NEXT_LOOP, &loops::MANUAL_MEMCPY, &loops::MUT_RANGE_BOUND, @@ -1265,8 +1264,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::EMPTY_LOOP), LintId::of(&loops::EXPLICIT_COUNTER_LOOP), LintId::of(&loops::FOR_KV_MAP), - LintId::of(&loops::FOR_LOOP_OVER_OPTION), - LintId::of(&loops::FOR_LOOP_OVER_RESULT), + LintId::of(&loops::FOR_LOOP_OVER_FALLIBLE), LintId::of(&loops::ITER_NEXT_LOOP), LintId::of(&loops::MANUAL_MEMCPY), LintId::of(&loops::MUT_RANGE_BOUND), @@ -1641,8 +1639,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&inline_fn_without_body::INLINE_FN_WITHOUT_BODY), LintId::of(&let_underscore::LET_UNDERSCORE_LOCK), LintId::of(&literal_representation::MISTYPED_LITERAL_SUFFIXES), - LintId::of(&loops::FOR_LOOP_OVER_OPTION), - LintId::of(&loops::FOR_LOOP_OVER_RESULT), + LintId::of(&loops::FOR_LOOP_OVER_FALLIBLE), LintId::of(&loops::ITER_NEXT_LOOP), LintId::of(&loops::NEVER_LOOP), LintId::of(&loops::WHILE_IMMUTABLE_CONDITION), diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 0bc6b7085..da6793a69 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -168,7 +168,7 @@ declare_clippy_lint! { } declare_clippy_lint! { - /// **What it does:** Checks for `for` loops over `Option` values. + /// **What it does:** Checks for `for` loops over `Option` or `Result` values. /// /// **Why is this bad?** Readability. This is more clearly expressed as an `if /// let`. @@ -176,47 +176,38 @@ declare_clippy_lint! { /// **Known problems:** None. /// /// **Example:** - /// ```ignore - /// for x in option { - /// .. + /// ```rust + /// # let opt = Some(1); + /// + /// // Bad + /// for x in opt { + /// // .. + /// } + /// + /// // Good + /// if let Some(x) = opt { + /// // .. /// } /// ``` /// - /// This should be - /// ```ignore - /// if let Some(x) = option { - /// .. + /// // or + /// + /// ```rust + /// # let res: Result = Ok(1); + /// + /// // Bad + /// for x in &res { + /// // .. + /// } + /// + /// // Good + /// if let Ok(x) = res { + /// // .. /// } /// ``` - pub FOR_LOOP_OVER_OPTION, + pub FOR_LOOP_OVER_FALLIBLE, correctness, - "for-looping over an `Option`, which is more clearly expressed as an `if let`" -} - -declare_clippy_lint! { - /// **What it does:** Checks for `for` loops over `Result` values. - /// - /// **Why is this bad?** Readability. This is more clearly expressed as an `if - /// let`. - /// - /// **Known problems:** None. - /// - /// **Example:** - /// ```ignore - /// for x in result { - /// .. - /// } - /// ``` - /// - /// This should be - /// ```ignore - /// if let Ok(x) = result { - /// .. - /// } - /// ``` - pub FOR_LOOP_OVER_RESULT, - correctness, - "for-looping over a `Result`, which is more clearly expressed as an `if let`" + "for-looping over an `Option` or a `Result`, which is more clearly expressed as an `if let`" } declare_clippy_lint! { @@ -435,8 +426,7 @@ declare_lint_pass!(Loops => [ EXPLICIT_ITER_LOOP, EXPLICIT_INTO_ITER_LOOP, ITER_NEXT_LOOP, - FOR_LOOP_OVER_RESULT, - FOR_LOOP_OVER_OPTION, + FOR_LOOP_OVER_FALLIBLE, WHILE_LET_LOOP, NEEDLESS_COLLECT, EXPLICIT_COUNTER_LOOP, @@ -1283,7 +1273,7 @@ fn check_for_loop_arg(cx: &LateContext<'_, '_>, pat: &Pat<'_>, arg: &Expr<'_>, e ITER_NEXT_LOOP, expr.span, "you are iterating over `Iterator::next()` which is an Option; this will compile but is \ - probably not what you want", + probably not what you want", ); next_loop_linted = true; } @@ -1300,11 +1290,11 @@ fn check_arg_type(cx: &LateContext<'_, '_>, pat: &Pat<'_>, arg: &Expr<'_>) { if is_type_diagnostic_item(cx, ty, sym!(option_type)) { span_lint_and_help( cx, - FOR_LOOP_OVER_OPTION, + FOR_LOOP_OVER_FALLIBLE, arg.span, &format!( "for loop over `{0}`, which is an `Option`. This is more readably written as an \ - `if let` statement.", + `if let` statement.", snippet(cx, arg.span, "_") ), None, @@ -1317,11 +1307,11 @@ fn check_arg_type(cx: &LateContext<'_, '_>, pat: &Pat<'_>, arg: &Expr<'_>) { } else if is_type_diagnostic_item(cx, ty, sym!(result_type)) { span_lint_and_help( cx, - FOR_LOOP_OVER_RESULT, + FOR_LOOP_OVER_FALLIBLE, arg.span, &format!( "for loop over `{0}`, which is a `Result`. This is more readably written as an \ - `if let` statement.", + `if let` statement.", snippet(cx, arg.span, "_") ), None, diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 4e79ce96b..0ea0f55a3 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -676,16 +676,9 @@ pub static ref ALL_LINTS: Vec = vec![ module: "loops", }, Lint { - name: "for_loop_over_option", + name: "for_loop_over_fallible", group: "correctness", - desc: "for-looping over an `Option`, which is more clearly expressed as an `if let`", - deprecation: None, - module: "loops", - }, - Lint { - name: "for_loop_over_result", - group: "correctness", - desc: "for-looping over a `Result`, which is more clearly expressed as an `if let`", + desc: "for-looping over an `Option` or a `Result`, which is more clearly expressed as an `if let`", deprecation: None, module: "loops", }, diff --git a/tests/ui/for_loop_over_option_result.rs b/tests/ui/for_loop_over_fallible.rs similarity index 81% rename from tests/ui/for_loop_over_option_result.rs rename to tests/ui/for_loop_over_fallible.rs index 6b207b26b..e52468cdd 100644 --- a/tests/ui/for_loop_over_option_result.rs +++ b/tests/ui/for_loop_over_fallible.rs @@ -1,18 +1,16 @@ -#![warn(clippy::for_loop_over_option, clippy::for_loop_over_result)] +#![warn(clippy::for_loop_over_fallible)] -/// Tests for_loop_over_result and for_loop_over_option - -fn for_loop_over_option_and_result() { +fn for_loop_over_fallible() { let option = Some(1); let result = option.ok_or("x not found"); let v = vec![0, 1, 2]; - // check FOR_LOOP_OVER_OPTION lint + // check over an `Option` for x in option { println!("{}", x); } - // check FOR_LOOP_OVER_RESULT lint + // check over a `Result` for x in result { println!("{}", x); } diff --git a/tests/ui/for_loop_over_option_result.stderr b/tests/ui/for_loop_over_fallible.stderr similarity index 81% rename from tests/ui/for_loop_over_option_result.stderr rename to tests/ui/for_loop_over_fallible.stderr index 194a0bfec..4ce9a144a 100644 --- a/tests/ui/for_loop_over_option_result.stderr +++ b/tests/ui/for_loop_over_fallible.stderr @@ -1,23 +1,22 @@ error: for loop over `option`, which is an `Option`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_option_result.rs:11:14 + --> $DIR/for_loop_over_fallible.rs:9:14 | LL | for x in option { | ^^^^^^ | - = note: `-D clippy::for-loop-over-option` implied by `-D warnings` + = note: `-D clippy::for-loop-over-fallible` implied by `-D warnings` = help: consider replacing `for x in option` with `if let Some(x) = option` error: for loop over `result`, which is a `Result`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_option_result.rs:16:14 + --> $DIR/for_loop_over_fallible.rs:14:14 | LL | for x in result { | ^^^^^^ | - = note: `-D clippy::for-loop-over-result` implied by `-D warnings` = help: consider replacing `for x in result` with `if let Ok(x) = result` error: for loop over `option.ok_or("x not found")`, which is a `Result`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_option_result.rs:20:14 + --> $DIR/for_loop_over_fallible.rs:18:14 | LL | for x in option.ok_or("x not found") { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -25,7 +24,7 @@ LL | for x in option.ok_or("x not found") { = help: consider replacing `for x in option.ok_or("x not found")` with `if let Ok(x) = option.ok_or("x not found")` error: you are iterating over `Iterator::next()` which is an Option; this will compile but is probably not what you want - --> $DIR/for_loop_over_option_result.rs:26:14 + --> $DIR/for_loop_over_fallible.rs:24:14 | LL | for x in v.iter().next() { | ^^^^^^^^^^^^^^^ @@ -33,7 +32,7 @@ LL | for x in v.iter().next() { = note: `#[deny(clippy::iter_next_loop)]` on by default error: for loop over `v.iter().next().and(Some(0))`, which is an `Option`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_option_result.rs:31:14 + --> $DIR/for_loop_over_fallible.rs:29:14 | LL | for x in v.iter().next().and(Some(0)) { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -41,7 +40,7 @@ LL | for x in v.iter().next().and(Some(0)) { = help: consider replacing `for x in v.iter().next().and(Some(0))` with `if let Some(x) = v.iter().next().and(Some(0))` error: for loop over `v.iter().next().ok_or("x not found")`, which is a `Result`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_option_result.rs:35:14 + --> $DIR/for_loop_over_fallible.rs:33:14 | LL | for x in v.iter().next().ok_or("x not found") { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -49,7 +48,7 @@ LL | for x in v.iter().next().ok_or("x not found") { = help: consider replacing `for x in v.iter().next().ok_or("x not found")` with `if let Ok(x) = v.iter().next().ok_or("x not found")` error: this loop never actually loops - --> $DIR/for_loop_over_option_result.rs:47:5 + --> $DIR/for_loop_over_fallible.rs:45:5 | LL | / while let Some(x) = option { LL | | println!("{}", x); @@ -60,7 +59,7 @@ LL | | } = note: `#[deny(clippy::never_loop)]` on by default error: this loop never actually loops - --> $DIR/for_loop_over_option_result.rs:53:5 + --> $DIR/for_loop_over_fallible.rs:51:5 | LL | / while let Ok(x) = result { LL | | println!("{}", x); From 95399f8f941b89785c6e9d94e0bc32ff5d43ba06 Mon Sep 17 00:00:00 2001 From: David Tolnay Date: Thu, 14 May 2020 09:57:36 -0700 Subject: [PATCH 0062/4780] Downgrade useless_let_if_seq to nursery --- clippy_lints/src/let_if_seq.rs | 2 +- clippy_lints/src/lib.rs | 3 +-- src/lintlist/mod.rs | 2 +- 3 files changed, 3 insertions(+), 4 deletions(-) diff --git a/clippy_lints/src/let_if_seq.rs b/clippy_lints/src/let_if_seq.rs index 398a3103a..d7bf8a147 100644 --- a/clippy_lints/src/let_if_seq.rs +++ b/clippy_lints/src/let_if_seq.rs @@ -50,7 +50,7 @@ declare_clippy_lint! { /// }; /// ``` pub USELESS_LET_IF_SEQ, - style, + nursery, "unidiomatic `let mut` declaration followed by initialization in `if`" } diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 0c4daeb73..b241ac555 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -1266,7 +1266,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&large_enum_variant::LARGE_ENUM_VARIANT), LintId::of(&len_zero::LEN_WITHOUT_IS_EMPTY), LintId::of(&len_zero::LEN_ZERO), - LintId::of(&let_if_seq::USELESS_LET_IF_SEQ), LintId::of(&let_underscore::LET_UNDERSCORE_LOCK), LintId::of(&lifetimes::EXTRA_UNUSED_LIFETIMES), LintId::of(&lifetimes::NEEDLESS_LIFETIMES), @@ -1476,7 +1475,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&inherent_to_string::INHERENT_TO_STRING), LintId::of(&len_zero::LEN_WITHOUT_IS_EMPTY), LintId::of(&len_zero::LEN_ZERO), - LintId::of(&let_if_seq::USELESS_LET_IF_SEQ), LintId::of(&literal_representation::INCONSISTENT_DIGIT_GROUPING), LintId::of(&loops::EMPTY_LOOP), LintId::of(&loops::FOR_KV_MAP), @@ -1728,6 +1726,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&floating_point_arithmetic::IMPRECISE_FLOPS), LintId::of(&floating_point_arithmetic::SUBOPTIMAL_FLOPS), LintId::of(&future_not_send::FUTURE_NOT_SEND), + LintId::of(&let_if_seq::USELESS_LET_IF_SEQ), LintId::of(&missing_const_for_fn::MISSING_CONST_FOR_FN), LintId::of(&mutable_debug_assertion::DEBUG_ASSERT_WITH_MUT_CALL), LintId::of(&mutex_atomic::MUTEX_INTEGER), diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index e1a6d4bdd..e1c68b58b 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -2469,7 +2469,7 @@ pub static ref ALL_LINTS: Vec = vec![ }, Lint { name: "useless_let_if_seq", - group: "style", + group: "nursery", desc: "unidiomatic `let mut` declaration followed by initialization in `if`", deprecation: None, module: "let_if_seq", From 94e4b5ec316993200d75276b4e7c16a059bf3a57 Mon Sep 17 00:00:00 2001 From: Vardan Margaryan Date: Sun, 10 May 2020 00:08:41 +0300 Subject: [PATCH 0063/4780] Add the redundant_wildcard_enum_match lint --- CHANGELOG.md | 1 + clippy_lints/src/lib.rs | 2 + clippy_lints/src/matches.rs | 48 +++++++++++++++++++ src/lintlist/mod.rs | 7 +++ .../match_wildcard_for_single_variants.fixed | 18 +++++++ .../ui/match_wildcard_for_single_variants.rs | 18 +++++++ .../match_wildcard_for_single_variants.stderr | 10 ++++ 7 files changed, 104 insertions(+) create mode 100644 tests/ui/match_wildcard_for_single_variants.fixed create mode 100644 tests/ui/match_wildcard_for_single_variants.rs create mode 100644 tests/ui/match_wildcard_for_single_variants.stderr diff --git a/CHANGELOG.md b/CHANGELOG.md index b25ef0493..d6298fec6 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1439,6 +1439,7 @@ Released 2018-09-13 [`match_same_arms`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_same_arms [`match_single_binding`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_single_binding [`match_wild_err_arm`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_wild_err_arm +[`match_wildcard_for_single_variants`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_wildcard_for_single_variants [`maybe_infinite_iter`]: https://rust-lang.github.io/rust-clippy/master/index.html#maybe_infinite_iter [`mem_discriminant_non_enum`]: https://rust-lang.github.io/rust-clippy/master/index.html#mem_discriminant_non_enum [`mem_forget`]: https://rust-lang.github.io/rust-clippy/master/index.html#mem_forget diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 0c4daeb73..41046c18e 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -641,6 +641,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &matches::MATCH_OVERLAPPING_ARM, &matches::MATCH_REF_PATS, &matches::MATCH_SINGLE_BINDING, + &matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS, &matches::MATCH_WILD_ERR_ARM, &matches::REST_PAT_IN_FULLY_BOUND_STRUCTS, &matches::SINGLE_MATCH, @@ -1147,6 +1148,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(¯o_use::MACRO_USE_IMPORTS), LintId::of(&match_on_vec_items::MATCH_ON_VEC_ITEMS), LintId::of(&matches::MATCH_BOOL), + LintId::of(&matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS), LintId::of(&matches::SINGLE_MATCH_ELSE), LintId::of(&methods::FILTER_MAP), LintId::of(&methods::FILTER_MAP_NEXT), diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs index 8f86535ef..42a6c4166 100644 --- a/clippy_lints/src/matches.rs +++ b/clippy_lints/src/matches.rs @@ -229,6 +229,40 @@ declare_clippy_lint! { "a wildcard enum match arm using `_`" } +declare_clippy_lint! { + /// **What it does:** Checks for wildcard enum matches for a single variant. + /// + /// **Why is this bad?** New enum variants added by library updates can be missed. + /// + /// **Known problems:** Suggested replacements may not use correct path to enum + /// if it's not present in the current scope. + /// + /// **Example:** + /// + /// ```rust + /// # enum Foo { A, B, C } + /// # let x = Foo::B; + /// match x { + /// Foo::A => {}, + /// Foo::B => {}, + /// _ => {}, + /// } + /// ``` + /// Use instead: + /// ```rust + /// # enum Foo { A, B, C } + /// # let x = Foo::B; + /// match x { + /// Foo::A => {}, + /// Foo::B => {}, + /// Foo::C => {}, + /// } + /// ``` + pub MATCH_WILDCARD_FOR_SINGLE_VARIANTS, + pedantic, + "a wildcard enum match for a single variant" +} + declare_clippy_lint! { /// **What it does:** Checks for wildcard pattern used with others patterns in same match arm. /// @@ -356,6 +390,7 @@ impl_lint_pass!(Matches => [ MATCH_WILD_ERR_ARM, MATCH_AS_REF, WILDCARD_ENUM_MATCH_ARM, + MATCH_WILDCARD_FOR_SINGLE_VARIANTS, WILDCARD_IN_OR_PATTERNS, MATCH_SINGLE_BINDING, INFALLIBLE_DESTRUCTURING_MATCH, @@ -766,6 +801,19 @@ fn check_wild_enum_match(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_ } } + if suggestion.len() == 1 { + // No need to check for non-exhaustive enum as in that case len would be greater than 1 + span_lint_and_sugg( + cx, + MATCH_WILDCARD_FOR_SINGLE_VARIANTS, + wildcard_span, + message, + "try this", + suggestion[0].clone(), + Applicability::MachineApplicable, + ) + }; + span_lint_and_sugg( cx, WILDCARD_ENUM_MATCH_ARM, diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index e1a6d4bdd..250a7c09f 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1200,6 +1200,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "matches", }, + Lint { + name: "match_wildcard_for_single_variants", + group: "pedantic", + desc: "a wildcard enum match for a single variant", + deprecation: None, + module: "matches", + }, Lint { name: "maybe_infinite_iter", group: "pedantic", diff --git a/tests/ui/match_wildcard_for_single_variants.fixed b/tests/ui/match_wildcard_for_single_variants.fixed new file mode 100644 index 000000000..5f1a559f5 --- /dev/null +++ b/tests/ui/match_wildcard_for_single_variants.fixed @@ -0,0 +1,18 @@ +// run-rustfix + +#![warn(clippy::match_wildcard_for_single_variants)] +#![allow(dead_code)] + +enum Foo { + A, + B, + C, +} + +fn main() { + match Foo::A { + Foo::A => {}, + Foo::B => {}, + Foo::C => {}, + } +} diff --git a/tests/ui/match_wildcard_for_single_variants.rs b/tests/ui/match_wildcard_for_single_variants.rs new file mode 100644 index 000000000..1159f9e72 --- /dev/null +++ b/tests/ui/match_wildcard_for_single_variants.rs @@ -0,0 +1,18 @@ +// run-rustfix + +#![warn(clippy::match_wildcard_for_single_variants)] +#![allow(dead_code)] + +enum Foo { + A, + B, + C, +} + +fn main() { + match Foo::A { + Foo::A => {}, + Foo::B => {}, + _ => {}, + } +} diff --git a/tests/ui/match_wildcard_for_single_variants.stderr b/tests/ui/match_wildcard_for_single_variants.stderr new file mode 100644 index 000000000..128dd4808 --- /dev/null +++ b/tests/ui/match_wildcard_for_single_variants.stderr @@ -0,0 +1,10 @@ +error: wildcard match will miss any future added variants + --> $DIR/match_wildcard_for_single_variants.rs:16:9 + | +LL | _ => {}, + | ^ help: try this: `Foo::C` + | + = note: `-D clippy::match-wildcard-for-single-variants` implied by `-D warnings` + +error: aborting due to previous error + From 0ad9f7d651b52de4be6384c9b6dc893b389fd557 Mon Sep 17 00:00:00 2001 From: Vardan Margaryan Date: Sun, 10 May 2020 18:33:12 +0300 Subject: [PATCH 0064/4780] Fix trivial cases of new match_wildcard_for_single_variants lint --- clippy_lints/src/float_literal.rs | 2 +- clippy_lints/src/misc_early.rs | 2 +- clippy_lints/src/missing_const_for_fn.rs | 2 +- clippy_lints/src/needless_pass_by_value.rs | 2 +- clippy_lints/src/trivially_copy_pass_by_ref.rs | 2 +- tests/compile-test.rs | 2 +- 6 files changed, 6 insertions(+), 6 deletions(-) diff --git a/clippy_lints/src/float_literal.rs b/clippy_lints/src/float_literal.rs index 3a52b1d3f..4c604cd01 100644 --- a/clippy_lints/src/float_literal.rs +++ b/clippy_lints/src/float_literal.rs @@ -77,7 +77,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for FloatLiteral { let type_suffix = match lit_float_ty { LitFloatType::Suffixed(FloatTy::F32) => Some("f32"), LitFloatType::Suffixed(FloatTy::F64) => Some("f64"), - _ => None + LitFloatType::Unsuffixed => None }; let (is_whole, mut float_str) = match fty { FloatTy::F32 => { diff --git a/clippy_lints/src/misc_early.rs b/clippy_lints/src/misc_early.rs index 62ee05162..552222eba 100644 --- a/clippy_lints/src/misc_early.rs +++ b/clippy_lints/src/misc_early.rs @@ -379,7 +379,7 @@ impl EarlyLintPass for MiscEarlyLints { let left_binding = match left { BindingMode::ByRef(Mutability::Mut) => "ref mut ", BindingMode::ByRef(Mutability::Not) => "ref ", - _ => "", + BindingMode::ByValue(..) => "", }; if let PatKind::Wild = right.kind { diff --git a/clippy_lints/src/missing_const_for_fn.rs b/clippy_lints/src/missing_const_for_fn.rs index 4301157e1..9cfc8d191 100644 --- a/clippy_lints/src/missing_const_for_fn.rs +++ b/clippy_lints/src/missing_const_for_fn.rs @@ -113,7 +113,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingConstForFn { return; } }, - _ => return, + FnKind::Closure(..) => return, } let mir = cx.tcx.optimized_mir(def_id); diff --git a/clippy_lints/src/needless_pass_by_value.rs b/clippy_lints/src/needless_pass_by_value.rs index a21818701..c099c5533 100644 --- a/clippy_lints/src/needless_pass_by_value.rs +++ b/clippy_lints/src/needless_pass_by_value.rs @@ -86,7 +86,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue { } }, FnKind::Method(..) => (), - _ => return, + FnKind::Closure(..) => return, } // Exclude non-inherent impls diff --git a/clippy_lints/src/trivially_copy_pass_by_ref.rs b/clippy_lints/src/trivially_copy_pass_by_ref.rs index 2c101220c..8e0cb9431 100644 --- a/clippy_lints/src/trivially_copy_pass_by_ref.rs +++ b/clippy_lints/src/trivially_copy_pass_by_ref.rs @@ -161,7 +161,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for TriviallyCopyPassByRef { } }, FnKind::Method(..) => (), - _ => return, + FnKind::Closure(..) => return, } // Exclude non-inherent impls diff --git a/tests/compile-test.rs b/tests/compile-test.rs index de2cf6d78..a3df9d5cc 100644 --- a/tests/compile-test.rs +++ b/tests/compile-test.rs @@ -44,7 +44,7 @@ fn third_party_crates() -> String { for entry in fs::read_dir(dep_dir).unwrap() { let path = match entry { Ok(entry) => entry.path(), - _ => continue, + Err(_) => continue, }; if let Some(name) = path.file_name().and_then(OsStr::to_str) { for dep in CRATES { From 494830797744c09d6de3b2b2452ab185d2204005 Mon Sep 17 00:00:00 2001 From: Vardan Margaryan Date: Sun, 10 May 2020 18:34:29 +0300 Subject: [PATCH 0065/4780] Fix cases of match_wildcard_for_single_variants lint when it is spanned on Option --- clippy_lints/src/consts.rs | 9 +++++---- clippy_lints/src/escape.rs | 4 ++-- clippy_lints/src/floating_point_arithmetic.rs | 2 +- clippy_lints/src/loops.rs | 2 +- clippy_lints/src/misc.rs | 2 +- clippy_lints/src/modulo_arithmetic.rs | 1 + clippy_lints/src/utils/mod.rs | 2 ++ 7 files changed, 13 insertions(+), 9 deletions(-) diff --git a/clippy_lints/src/consts.rs b/clippy_lints/src/consts.rs index 81ddc8c00..efb424bcb 100644 --- a/clippy_lints/src/consts.rs +++ b/clippy_lints/src/consts.rs @@ -139,6 +139,7 @@ impl Constant { .find(|r| r.map_or(true, |o| o != Ordering::Equal)) .unwrap_or_else(|| Some(l.len().cmp(&r.len()))), (&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => { + #[allow(clippy::match_wildcard_for_single_variants)] match Self::partial_cmp(tcx, cmp_type, lv, rv) { Some(Equal) => Some(ls.cmp(rs)), x => x, @@ -354,14 +355,14 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> { (Some(Constant::Vec(vec)), Some(Constant::Int(index))) => match vec.get(index as usize) { Some(Constant::F32(x)) => Some(Constant::F32(*x)), Some(Constant::F64(x)) => Some(Constant::F64(*x)), - _ => None, + Some(_) | None => None, }, (Some(Constant::Vec(vec)), _) => { if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) { match vec.get(0) { Some(Constant::F32(x)) => Some(Constant::F32(*x)), Some(Constant::F64(x)) => Some(Constant::F64(*x)), - _ => None, + Some(_) | None => None, } } else { None @@ -532,7 +533,7 @@ pub fn miri_to_const(result: &ty::Const<'_>) -> Option { }) .collect::>>() .map(Constant::Vec), - _ => None, + Some(_) | None => None, }, ty::Float(FloatTy::F64) => match miri_to_const(len) { Some(Constant::Int(len)) => alloc @@ -546,7 +547,7 @@ pub fn miri_to_const(result: &ty::Const<'_>) -> Option { }) .collect::>>() .map(Constant::Vec), - _ => None, + Some(_) | None => None, }, // FIXME: implement other array type conversions. _ => None, diff --git a/clippy_lints/src/escape.rs b/clippy_lints/src/escape.rs index 1ec60a0e6..615afee33 100644 --- a/clippy_lints/src/escape.rs +++ b/clippy_lints/src/escape.rs @@ -95,12 +95,12 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BoxedLocal { fn is_argument(map: rustc_middle::hir::map::Map<'_>, id: HirId) -> bool { match map.find(id) { Some(Node::Binding(_)) => (), - _ => return false, + Some(_) | None => return false, } match map.find(map.get_parent_node(id)) { Some(Node::Param(_)) => true, - _ => false, + Some(_) | None => false, } } diff --git a/clippy_lints/src/floating_point_arithmetic.rs b/clippy_lints/src/floating_point_arithmetic.rs index 86317fb8b..8c61b2f86 100644 --- a/clippy_lints/src/floating_point_arithmetic.rs +++ b/clippy_lints/src/floating_point_arithmetic.rs @@ -410,7 +410,7 @@ fn is_zero(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { Some(Constant::Int(i)) => i == 0, Some(Constant::F32(f)) => f == 0.0, Some(Constant::F64(f)) => f == 0.0, - _ => false, + Some(_) | None => false, } } diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 0bc6b7085..39908bff5 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -2154,7 +2154,7 @@ fn is_loop_nested(cx: &LateContext<'_, '_>, loop_expr: &Expr<'_>, iter_expr: &Ex } }, Some(Node::Stmt(_)) => (), - _ => { + Some(_) | None => { return false; }, } diff --git a/clippy_lints/src/misc.rs b/clippy_lints/src/misc.rs index e1d524c22..38c2645d3 100644 --- a/clippy_lints/src/misc.rs +++ b/clippy_lints/src/misc.rs @@ -509,7 +509,7 @@ fn is_allowed<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) -> boo Constant::F64(f) => *f == 0.0 || (*f).is_infinite(), _ => false, }), - _ => false, + Some(_) | None => false, } } diff --git a/clippy_lints/src/modulo_arithmetic.rs b/clippy_lints/src/modulo_arithmetic.rs index 4ca90455b..3bb3eb15d 100644 --- a/clippy_lints/src/modulo_arithmetic.rs +++ b/clippy_lints/src/modulo_arithmetic.rs @@ -37,6 +37,7 @@ struct OperandInfo { } fn analyze_operand(operand: &Expr<'_>, cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option { + #[allow(clippy::match_wildcard_for_single_variants)] match constant(cx, cx.tables, operand) { Some((Constant::Int(v), _)) => match cx.tables.expr_ty(expr).kind { ty::Int(ity) => { diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index 3b8ef18bf..7bc8be492 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -370,6 +370,7 @@ pub fn trait_ref_of_method<'tcx>(cx: &LateContext<'_, 'tcx>, hir_id: HirId) -> O /// Checks whether this type implements `Drop`. pub fn has_drop<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, ty: Ty<'tcx>) -> bool { + #[allow(clippy::match_wildcard_for_single_variants)] match ty.ty_adt_def() { Some(def) => def.has_dtor(cx.tcx), _ => false, @@ -444,6 +445,7 @@ pub fn is_entrypoint_fn(cx: &LateContext<'_, '_>, def_id: DefId) -> bool { /// Gets the name of the item the expression is in, if available. pub fn get_item_name(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option { let parent_id = cx.tcx.hir().get_parent_item(expr.hir_id); + #[allow(clippy::match_wildcard_for_single_variants)] match cx.tcx.hir().find(parent_id) { Some( Node::Item(Item { ident, .. }) From 749619cfe34be1ee591f3af748fbdd4d2f54d3f0 Mon Sep 17 00:00:00 2001 From: Vardan Margaryan Date: Thu, 14 May 2020 22:40:33 +0300 Subject: [PATCH 0066/4780] Apply suggestions from PR review --- clippy_lints/src/matches.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs index 42a6c4166..444f5bb0d 100644 --- a/clippy_lints/src/matches.rs +++ b/clippy_lints/src/matches.rs @@ -810,7 +810,7 @@ fn check_wild_enum_match(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_ message, "try this", suggestion[0].clone(), - Applicability::MachineApplicable, + Applicability::MaybeIncorrect, ) }; @@ -821,7 +821,7 @@ fn check_wild_enum_match(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_ message, "try this", suggestion.join(" | "), - Applicability::MachineApplicable, + Applicability::MaybeIncorrect, ) } } From 1c59cd5f2110ff90a256f0948f05716403e84b85 Mon Sep 17 00:00:00 2001 From: Vardan Margaryan Date: Thu, 14 May 2020 22:41:05 +0300 Subject: [PATCH 0067/4780] Fix example code of wildcard_enum_match_arm lint --- clippy_lints/src/matches.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs index 444f5bb0d..6fdb4cf9c 100644 --- a/clippy_lints/src/matches.rs +++ b/clippy_lints/src/matches.rs @@ -220,7 +220,7 @@ declare_clippy_lint! { /// # enum Foo { A(usize), B(usize) } /// # let x = Foo::B(1); /// match x { - /// A => {}, + /// Foo::A(_) => {}, /// _ => {}, /// } /// ``` From 93386563f66823ac7d10641c007b0bbc23ab09e6 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sun, 3 May 2020 19:58:27 +0200 Subject: [PATCH 0068/4780] Rename lint `map_unwrap` to `map_unwrap_or` and register lints as renamed --- CHANGELOG.md | 3 +- clippy_lints/src/lib.rs | 15 ++++++++-- clippy_lints/src/methods/mod.rs | 8 +++--- .../src/methods/option_map_unwrap_or.rs | 4 +-- src/lintlist/mod.rs | 9 +----- tests/ui/{map_unwrap.rs => map_unwrap_or.rs} | 2 +- ...map_unwrap.stderr => map_unwrap_or.stderr} | 28 +++++++++---------- 7 files changed, 36 insertions(+), 33 deletions(-) rename tests/ui/{map_unwrap.rs => map_unwrap_or.rs} (98%) rename tests/ui/{map_unwrap.stderr => map_unwrap_or.stderr} (90%) diff --git a/CHANGELOG.md b/CHANGELOG.md index 3f9486e09..77272f4f7 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1430,7 +1430,7 @@ Released 2018-09-13 [`map_clone`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_clone [`map_entry`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_entry [`map_flatten`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_flatten -[`map_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_unwrap +[`map_unwrap_or`]: https://rust-lang.github.io/rust-clippy/master/index.html#map_unwrap_or [`match_as_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_as_ref [`match_bool`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_bool [`match_on_vec_items`]: https://rust-lang.github.io/rust-clippy/master/index.html#match_on_vec_items @@ -1538,7 +1538,6 @@ Released 2018-09-13 [`rest_pat_in_fully_bound_structs`]: https://rust-lang.github.io/rust-clippy/master/index.html#rest_pat_in_fully_bound_structs [`result_map_or_into_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_or_into_option [`result_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unit_fn -[`result_unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_unwrap_used [`reversed_empty_ranges`]: https://rust-lang.github.io/rust-clippy/master/index.html#reversed_empty_ranges [`same_functions_in_if_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#same_functions_in_if_condition [`search_is_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#search_is_some diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 8de94d19d..ff67ccae7 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -673,7 +673,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &methods::ITER_SKIP_NEXT, &methods::MANUAL_SATURATING_ARITHMETIC, &methods::MAP_FLATTEN, - &methods::MAP_UNWRAP, + &methods::MAP_UNWRAP_OR, &methods::NEW_RET_NO_SELF, &methods::OK_EXPECT, &methods::OPTION_AND_THEN_SOME, @@ -1145,7 +1145,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&methods::FIND_MAP), LintId::of(&methods::INEFFICIENT_TO_STRING), LintId::of(&methods::MAP_FLATTEN), - LintId::of(&methods::MAP_UNWRAP), + LintId::of(&methods::MAP_UNWRAP_OR), LintId::of(&misc::USED_UNDERSCORE_BINDING), LintId::of(&misc_early::UNSEPARATED_LITERAL_SUFFIX), LintId::of(&mut_mut::MUT_MUT), @@ -1785,6 +1785,17 @@ pub fn register_renamed(ls: &mut rustc_lint::LintStore) { ls.register_renamed("clippy::new_without_default_derive", "clippy::new_without_default"); ls.register_renamed("clippy::cyclomatic_complexity", "clippy::cognitive_complexity"); ls.register_renamed("clippy::const_static_lifetime", "clippy::redundant_static_lifetimes"); + ls.register_renamed("clippy::block_in_if_condition_expr", "clippy::block_in_if_condition"); + ls.register_renamed("clippy::block_in_if_condition_stmt", "clippy::block_in_if_condition"); + ls.register_renamed("clippy::option_map_unwrap_or", "clippy::map_unwrap_or"); + ls.register_renamed("clippy::option_map_unwrap_or_else", "clippy::map_unwrap_or"); + ls.register_renamed("clippy::result_map_unwrap_or_else", "clippy::map_unwrap_or"); + ls.register_renamed("clippy::option_unwrap_used", "clippy::unwrap_used"); + ls.register_renamed("clippy::result_unwrap_used", "clippy::unwrap_used"); + ls.register_renamed("clippy::option_expect_used", "clippy::expect_used"); + ls.register_renamed("clippy::result_expect_used", "clippy::expect_used"); + ls.register_renamed("clippy::for_loop_over_option", "clippy::for_loop_over_fallible"); + ls.register_renamed("clippy::for_loop_over_result", "clippy::for_loop_over_fallible"); } // only exists to let the dogfood integration test works. diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index 2e75de019..e6094edc5 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -255,7 +255,7 @@ declare_clippy_lint! { /// // Good /// x.map_or_else(some_function, |a| a + 1); /// ``` - pub MAP_UNWRAP, + pub MAP_UNWRAP_OR, pedantic, "using `.map(f).unwrap_or(a)` or `.map(f).unwrap_or_else(func)`, which are more succinctly expressed as `map_or(a, f)` or `map_or_else(a, f)`" } @@ -1240,7 +1240,7 @@ declare_lint_pass!(Methods => [ WRONG_SELF_CONVENTION, WRONG_PUB_SELF_CONVENTION, OK_EXPECT, - MAP_UNWRAP, + MAP_UNWRAP_OR, RESULT_MAP_OR_INTO_OPTION, OPTION_MAP_OR_NONE, OPTION_AND_THEN_SOME, @@ -2512,7 +2512,7 @@ fn lint_map_unwrap_or_else<'a, 'tcx>( if same_span && !multiline { span_lint_and_note( cx, - MAP_UNWRAP, + MAP_UNWRAP_OR, expr.span, msg, None, @@ -2522,7 +2522,7 @@ fn lint_map_unwrap_or_else<'a, 'tcx>( ), ); } else if same_span && multiline { - span_lint(cx, MAP_UNWRAP, expr.span, msg); + span_lint(cx, MAP_UNWRAP_OR, expr.span, msg); }; } } diff --git a/clippy_lints/src/methods/option_map_unwrap_or.rs b/clippy_lints/src/methods/option_map_unwrap_or.rs index fcaa9b47e..20c60ef33 100644 --- a/clippy_lints/src/methods/option_map_unwrap_or.rs +++ b/clippy_lints/src/methods/option_map_unwrap_or.rs @@ -9,7 +9,7 @@ use rustc_middle::hir::map::Map; use rustc_span::source_map::Span; use rustc_span::symbol::Symbol; -use super::MAP_UNWRAP; +use super::MAP_UNWRAP_OR; /// lint use of `map().unwrap_or()` for `Option`s pub(super) fn lint<'a, 'tcx>( @@ -66,7 +66,7 @@ pub(super) fn lint<'a, 'tcx>( arg, suggest ); - span_lint_and_then(cx, MAP_UNWRAP, expr.span, msg, |diag| { + span_lint_and_then(cx, MAP_UNWRAP_OR, expr.span, msg, |diag| { let map_arg_span = map_args[1].span; let mut suggestion = vec![ diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 0ea0f55a3..e90b9c157 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1138,7 +1138,7 @@ pub static ref ALL_LINTS: Vec = vec![ module: "methods", }, Lint { - name: "map_unwrap", + name: "map_unwrap_or", group: "pedantic", desc: "using `.map(f).unwrap_or(a)` or `.map(f).unwrap_or_else(func)`, which are more succinctly expressed as `map_or(a, f)` or `map_or_else(a, f)`", deprecation: None, @@ -1872,13 +1872,6 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "map_unit_fn", }, - Lint { - name: "result_unwrap_used", - group: "restriction", - desc: "using `Result.unwrap()`, which might be better handled", - deprecation: None, - module: "methods", - }, Lint { name: "reversed_empty_ranges", group: "correctness", diff --git a/tests/ui/map_unwrap.rs b/tests/ui/map_unwrap_or.rs similarity index 98% rename from tests/ui/map_unwrap.rs rename to tests/ui/map_unwrap_or.rs index 53e503682..585944032 100644 --- a/tests/ui/map_unwrap.rs +++ b/tests/ui/map_unwrap_or.rs @@ -1,7 +1,7 @@ // FIXME: Add "run-rustfix" once it's supported for multipart suggestions // aux-build:option_helpers.rs -#![warn(clippy::map_unwrap)] +#![warn(clippy::map_unwrap_or)] #[macro_use] extern crate option_helpers; diff --git a/tests/ui/map_unwrap.stderr b/tests/ui/map_unwrap_or.stderr similarity index 90% rename from tests/ui/map_unwrap.stderr rename to tests/ui/map_unwrap_or.stderr index 261092327..b62080a07 100644 --- a/tests/ui/map_unwrap.stderr +++ b/tests/ui/map_unwrap_or.stderr @@ -1,5 +1,5 @@ error: called `map(f).unwrap_or(a)` on an `Option` value. This can be done more directly by calling `map_or(a, f)` instead - --> $DIR/map_unwrap.rs:17:13 + --> $DIR/map_unwrap_or.rs:17:13 | LL | let _ = opt.map(|x| x + 1) | _____________^ @@ -7,14 +7,14 @@ LL | | // Should lint even though this call is on a separate line. LL | | .unwrap_or(0); | |_____________________^ | - = note: `-D clippy::map-unwrap` implied by `-D warnings` + = note: `-D clippy::map-unwrap-or` implied by `-D warnings` help: use `map_or(a, f)` instead | LL | let _ = opt.map_or(0, |x| x + 1); | ^^^^^^ ^^ -- error: called `map(f).unwrap_or(a)` on an `Option` value. This can be done more directly by calling `map_or(a, f)` instead - --> $DIR/map_unwrap.rs:21:13 + --> $DIR/map_unwrap_or.rs:21:13 | LL | let _ = opt.map(|x| { | _____________^ @@ -32,7 +32,7 @@ LL | ); | error: called `map(f).unwrap_or(a)` on an `Option` value. This can be done more directly by calling `map_or(a, f)` instead - --> $DIR/map_unwrap.rs:25:13 + --> $DIR/map_unwrap_or.rs:25:13 | LL | let _ = opt.map(|x| x + 1) | _____________^ @@ -49,7 +49,7 @@ LL | }, |x| x + 1); | error: called `map(f).unwrap_or(None)` on an `Option` value. This can be done more directly by calling `and_then(f)` instead - --> $DIR/map_unwrap.rs:30:13 + --> $DIR/map_unwrap_or.rs:30:13 | LL | let _ = opt.map(|x| Some(x + 1)).unwrap_or(None); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -60,7 +60,7 @@ LL | let _ = opt.and_then(|x| Some(x + 1)); | ^^^^^^^^ -- error: called `map(f).unwrap_or(None)` on an `Option` value. This can be done more directly by calling `and_then(f)` instead - --> $DIR/map_unwrap.rs:32:13 + --> $DIR/map_unwrap_or.rs:32:13 | LL | let _ = opt.map(|x| { | _____________^ @@ -78,7 +78,7 @@ LL | ); | error: called `map(f).unwrap_or(None)` on an `Option` value. This can be done more directly by calling `and_then(f)` instead - --> $DIR/map_unwrap.rs:36:13 + --> $DIR/map_unwrap_or.rs:36:13 | LL | let _ = opt | _____________^ @@ -92,7 +92,7 @@ LL | .and_then(|x| Some(x + 1)); | ^^^^^^^^ -- error: called `map(f).unwrap_or(a)` on an `Option` value. This can be done more directly by calling `map_or(a, f)` instead - --> $DIR/map_unwrap.rs:47:13 + --> $DIR/map_unwrap_or.rs:47:13 | LL | let _ = Some("prefix").map(|p| format!("{}.", p)).unwrap_or(id); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -103,7 +103,7 @@ LL | let _ = Some("prefix").map_or(id, |p| format!("{}.", p)); | ^^^^^^ ^^^ -- error: called `map(f).unwrap_or_else(g)` on an `Option` value. This can be done more directly by calling `map_or_else(g, f)` instead - --> $DIR/map_unwrap.rs:51:13 + --> $DIR/map_unwrap_or.rs:51:13 | LL | let _ = opt.map(|x| x + 1) | _____________^ @@ -114,7 +114,7 @@ LL | | .unwrap_or_else(|| 0); = note: replace `map(|x| x + 1).unwrap_or_else(|| 0)` with `map_or_else(|| 0, |x| x + 1)` error: called `map(f).unwrap_or_else(g)` on an `Option` value. This can be done more directly by calling `map_or_else(g, f)` instead - --> $DIR/map_unwrap.rs:55:13 + --> $DIR/map_unwrap_or.rs:55:13 | LL | let _ = opt.map(|x| { | _____________^ @@ -124,7 +124,7 @@ LL | | ).unwrap_or_else(|| 0); | |__________________________^ error: called `map(f).unwrap_or_else(g)` on an `Option` value. This can be done more directly by calling `map_or_else(g, f)` instead - --> $DIR/map_unwrap.rs:59:13 + --> $DIR/map_unwrap_or.rs:59:13 | LL | let _ = opt.map(|x| x + 1) | _____________^ @@ -134,7 +134,7 @@ LL | | ); | |_________^ error: called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling `.map_or_else(g, f)` instead - --> $DIR/map_unwrap.rs:88:13 + --> $DIR/map_unwrap_or.rs:88:13 | LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); // should lint even though this call is on a separate line | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -142,7 +142,7 @@ LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); // should lint even t = note: replace `map(|x| x + 1).unwrap_or_else(|e| 0)` with `map_or_else(|e| 0, |x| x + 1)` error: called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling `.map_or_else(g, f)` instead - --> $DIR/map_unwrap.rs:90:13 + --> $DIR/map_unwrap_or.rs:90:13 | LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -150,7 +150,7 @@ LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); = note: replace `map(|x| x + 1).unwrap_or_else(|e| 0)` with `map_or_else(|e| 0, |x| x + 1)` error: called `map(f).unwrap_or_else(g)` on a `Result` value. This can be done more directly by calling `.map_or_else(g, f)` instead - --> $DIR/map_unwrap.rs:91:13 + --> $DIR/map_unwrap_or.rs:91:13 | LL | let _ = res.map(|x| x + 1).unwrap_or_else(|e| 0); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ From ab87f87ba03518da23ca510249aa3f5908a42368 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Fri, 15 May 2020 18:20:07 +0200 Subject: [PATCH 0069/4780] Fix CHANGELOG.md and lint names plural --- CHANGELOG.md | 22 ++++++++--------- ...ondition.rs => blocks_in_if_conditions.rs} | 12 +++++----- clippy_lints/src/lib.rs | 24 +++++++++---------- clippy_lints/src/loops.rs | 8 +++---- src/lintlist/mod.rs | 6 ++--- ...on.fixed => blocks_in_if_conditions.fixed} | 2 +- ...ondition.rs => blocks_in_if_conditions.rs} | 2 +- ....stderr => blocks_in_if_conditions.stderr} | 8 +++---- ....rs => blocks_in_if_conditions_closure.rs} | 2 +- ...=> blocks_in_if_conditions_closure.stderr} | 6 ++--- ...allible.rs => for_loops_over_fallibles.rs} | 4 ++-- ...stderr => for_loops_over_fallibles.stderr} | 18 +++++++------- 12 files changed, 57 insertions(+), 57 deletions(-) rename clippy_lints/src/{block_in_if_condition.rs => blocks_in_if_conditions.rs} (93%) rename tests/ui/{block_in_if_condition.fixed => blocks_in_if_conditions.fixed} (96%) rename tests/ui/{block_in_if_condition.rs => blocks_in_if_conditions.rs} (96%) rename tests/ui/{block_in_if_condition.stderr => blocks_in_if_conditions.stderr} (77%) rename tests/ui/{block_in_if_condition_closure.rs => blocks_in_if_conditions_closure.rs} (95%) rename tests/ui/{block_in_if_condition_closure.stderr => blocks_in_if_conditions_closure.stderr} (78%) rename tests/ui/{for_loop_over_fallible.rs => for_loops_over_fallibles.rs} (93%) rename tests/ui/{for_loop_over_fallible.stderr => for_loops_over_fallibles.stderr} (84%) diff --git a/CHANGELOG.md b/CHANGELOG.md index 77272f4f7..d05819a97 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -198,7 +198,7 @@ Released 2020-03-12 ### Suggestion Improvements -* [`option_map_unwrap_or`] [#4634](https://github.com/rust-lang/rust-clippy/pull/4634) +* `option_map_unwrap_or` [#4634](https://github.com/rust-lang/rust-clippy/pull/4634) * [`wildcard_enum_match_arm`] [#4934](https://github.com/rust-lang/rust-clippy/pull/4934) * [`cognitive_complexity`] [#4935](https://github.com/rust-lang/rust-clippy/pull/4935) * [`decimal_literal_representation`] [#4956](https://github.com/rust-lang/rust-clippy/pull/4956) @@ -282,8 +282,8 @@ Released 2019-12-19 * [`panic`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657) * [`unreachable`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657) * [`todo`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657) - * [`option_expect_used`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657) - * [`result_expect_used`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657) + * `option_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657) + * `result_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657) * Move `redundant_clone` to perf group [#4509](https://github.com/rust-lang/rust-clippy/pull/4509) * Move `manual_mul_add` to nursery group [#4736](https://github.com/rust-lang/rust-clippy/pull/4736) * Expand `unit_cmp` to also work with `assert_eq!`, `debug_assert_eq!`, `assert_ne!` and `debug_assert_ne!` [#4613](https://github.com/rust-lang/rust-clippy/pull/4613) @@ -395,7 +395,7 @@ Released 2019-08-15 * Fix false positive in [`useless_attribute`] [#4107](https://github.com/rust-lang/rust-clippy/pull/4107) * Fix incorrect suggestion for [`float_cmp`] [#4214](https://github.com/rust-lang/rust-clippy/pull/4214) * Add suggestions for [`print_with_newline`] and [`write_with_newline`] [#4136](https://github.com/rust-lang/rust-clippy/pull/4136) -* Improve suggestions for [`option_map_unwrap_or_else`] and [`result_map_unwrap_or_else`] [#4164](https://github.com/rust-lang/rust-clippy/pull/4164) +* Improve suggestions for `option_map_unwrap_or_else` and `result_map_unwrap_or_else` [#4164](https://github.com/rust-lang/rust-clippy/pull/4164) * Improve suggestions for [`non_ascii_literal`] [#4119](https://github.com/rust-lang/rust-clippy/pull/4119) * Improve diagnostics for [`let_and_return`] [#4137](https://github.com/rust-lang/rust-clippy/pull/4137) * Improve diagnostics for [`trivially_copy_pass_by_ref`] [#4071](https://github.com/rust-lang/rust-clippy/pull/4071) @@ -448,7 +448,7 @@ Released 2019-05-20 * Fix false positive in [`needless_range_loop`] pertaining to structs without a `.iter()` * Fix false positive in [`bool_comparison`] pertaining to non-bool types * Fix false positive in [`redundant_closure`] pertaining to differences in borrows -* Fix false positive in [`option_map_unwrap_or`] on non-copy types +* Fix false positive in `option_map_unwrap_or` on non-copy types * Fix false positives in [`missing_const_for_fn`] pertaining to macros and trait method impls * Fix false positive in [`needless_pass_by_value`] pertaining to procedural macros * Fix false positive in [`needless_continue`] pertaining to loop labels @@ -794,7 +794,7 @@ Released 2018-09-13 ## 0.0.169 * Rustup to *rustc 1.23.0-nightly (3b82e4c74 2017-11-05)* -* New lints: [`just_underscores_and_digits`], [`result_map_unwrap_or_else`], [`transmute_bytes_to_str`] +* New lints: [`just_underscores_and_digits`], `result_map_unwrap_or_else`, [`transmute_bytes_to_str`] ## 0.0.168 * Rustup to *rustc 1.23.0-nightly (f0fe716db 2017-10-30)* @@ -1068,7 +1068,7 @@ Released 2018-09-13 ## 0.0.93 — 2016-10-03 * Rustup to *rustc 1.14.0-nightly (144af3e97 2016-10-02)* -* [`option_map_unwrap_or`] and [`option_map_unwrap_or_else`] are now +* `option_map_unwrap_or` and `option_map_unwrap_or_else` are now allowed by default. * New lint: [`explicit_into_iter_loop`] @@ -1087,8 +1087,8 @@ Released 2018-09-13 ## 0.0.88 — 2016-09-04 * Rustup to *rustc 1.13.0-nightly (70598e04f 2016-09-03)* * The following lints are not new but were only usable through the `clippy` - lint groups: [`filter_next`], [`for_loop_over_option`], - [`for_loop_over_result`] and [`match_overlapping_arm`]. You should now be + lint groups: [`filter_next`], `for_loop_over_option`, + `for_loop_over_result` and [`match_overlapping_arm`]. You should now be able to `#[allow/deny]` them individually and they are available directly through `cargo clippy`. @@ -1274,7 +1274,7 @@ Released 2018-09-13 [`await_holding_lock`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_lock [`bad_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#bad_bit_mask [`blacklisted_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#blacklisted_name -[`block_in_if_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition +[`blocks_in_if_conditions`]: https://rust-lang.github.io/rust-clippy/master/index.html#blocks_in_if_conditions [`bool_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison [`borrow_interior_mutable_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_interior_mutable_const [`borrowed_box`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box @@ -1361,7 +1361,7 @@ Released 2018-09-13 [`fn_to_numeric_cast`]: https://rust-lang.github.io/rust-clippy/master/index.html#fn_to_numeric_cast [`fn_to_numeric_cast_with_truncation`]: https://rust-lang.github.io/rust-clippy/master/index.html#fn_to_numeric_cast_with_truncation [`for_kv_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#for_kv_map -[`for_loop_over_fallible`]: https://rust-lang.github.io/rust-clippy/master/index.html#for_loop_over_fallible +[`for_loops_over_fallibles`]: https://rust-lang.github.io/rust-clippy/master/index.html#for_loops_over_fallibles [`forget_copy`]: https://rust-lang.github.io/rust-clippy/master/index.html#forget_copy [`forget_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#forget_ref [`future_not_send`]: https://rust-lang.github.io/rust-clippy/master/index.html#future_not_send diff --git a/clippy_lints/src/block_in_if_condition.rs b/clippy_lints/src/blocks_in_if_conditions.rs similarity index 93% rename from clippy_lints/src/block_in_if_condition.rs rename to clippy_lints/src/blocks_in_if_conditions.rs index 8a5e59574..8fa9b05ca 100644 --- a/clippy_lints/src/block_in_if_condition.rs +++ b/clippy_lints/src/blocks_in_if_conditions.rs @@ -36,12 +36,12 @@ declare_clippy_lint! { /// let res = { let x = somefunc(); x }; /// if res { /* ... */ } /// ``` - pub BLOCK_IN_IF_CONDITION, + pub BLOCKS_IN_IF_CONDITIONS, style, "useless or complex blocks that can be eliminated in conditions" } -declare_lint_pass!(BlockInIfCondition => [BLOCK_IN_IF_CONDITION]); +declare_lint_pass!(BlocksInIfConditions => [BLOCKS_IN_IF_CONDITIONS]); struct ExVisitor<'a, 'tcx> { found_block: Option<&'tcx Expr<'tcx>>, @@ -71,7 +71,7 @@ const BRACED_EXPR_MESSAGE: &str = "omit braces around single expression conditio const COMPLEX_BLOCK_MESSAGE: &str = "in an `if` condition, avoid complex blocks or closures with blocks; \ instead, move the block or closure higher and bind it with a `let`"; -impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BlockInIfCondition { +impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BlocksInIfConditions { fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) { if in_external_macro(cx.sess(), expr.span) { return; @@ -89,7 +89,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BlockInIfCondition { let mut applicability = Applicability::MachineApplicable; span_lint_and_sugg( cx, - BLOCK_IN_IF_CONDITION, + BLOCKS_IN_IF_CONDITIONS, cond.span, BRACED_EXPR_MESSAGE, "try", @@ -115,7 +115,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BlockInIfCondition { let mut applicability = Applicability::MachineApplicable; span_lint_and_sugg( cx, - BLOCK_IN_IF_CONDITION, + BLOCKS_IN_IF_CONDITIONS, expr.span.with_hi(cond.span.hi()), COMPLEX_BLOCK_MESSAGE, "try", @@ -137,7 +137,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BlockInIfCondition { let mut visitor = ExVisitor { found_block: None, cx }; walk_expr(&mut visitor, cond); if let Some(block) = visitor.found_block { - span_lint(cx, BLOCK_IN_IF_CONDITION, block.span, COMPLEX_BLOCK_MESSAGE); + span_lint(cx, BLOCKS_IN_IF_CONDITIONS, block.span, COMPLEX_BLOCK_MESSAGE); } } } diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index ff67ccae7..eba4ab505 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -180,7 +180,7 @@ mod attrs; mod await_holding_lock; mod bit_mask; mod blacklisted_name; -mod block_in_if_condition; +mod blocks_in_if_conditions; mod booleans; mod bytecount; mod cargo_common_metadata; @@ -507,7 +507,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &bit_mask::INEFFECTIVE_BIT_MASK, &bit_mask::VERBOSE_BIT_MASK, &blacklisted_name::BLACKLISTED_NAME, - &block_in_if_condition::BLOCK_IN_IF_CONDITION, + &blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS, &booleans::LOGIC_BUG, &booleans::NONMINIMAL_BOOL, &bytecount::NAIVE_BYTECOUNT, @@ -615,7 +615,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &loops::EXPLICIT_INTO_ITER_LOOP, &loops::EXPLICIT_ITER_LOOP, &loops::FOR_KV_MAP, - &loops::FOR_LOOP_OVER_FALLIBLE, + &loops::FOR_LOOPS_OVER_FALLIBLES, &loops::ITER_NEXT_LOOP, &loops::MANUAL_MEMCPY, &loops::MUT_RANGE_BOUND, @@ -894,7 +894,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box mut_reference::UnnecessaryMutPassed); store.register_late_pass(|| box len_zero::LenZero); store.register_late_pass(|| box attrs::Attributes); - store.register_late_pass(|| box block_in_if_condition::BlockInIfCondition); + store.register_late_pass(|| box blocks_in_if_conditions::BlocksInIfConditions); store.register_late_pass(|| box unicode::Unicode); store.register_late_pass(|| box strings::StringAdd); store.register_late_pass(|| box implicit_return::ImplicitReturn); @@ -1199,7 +1199,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&bit_mask::INEFFECTIVE_BIT_MASK), LintId::of(&bit_mask::VERBOSE_BIT_MASK), LintId::of(&blacklisted_name::BLACKLISTED_NAME), - LintId::of(&block_in_if_condition::BLOCK_IN_IF_CONDITION), + LintId::of(&blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS), LintId::of(&booleans::LOGIC_BUG), LintId::of(&booleans::NONMINIMAL_BOOL), LintId::of(&bytecount::NAIVE_BYTECOUNT), @@ -1264,7 +1264,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::EMPTY_LOOP), LintId::of(&loops::EXPLICIT_COUNTER_LOOP), LintId::of(&loops::FOR_KV_MAP), - LintId::of(&loops::FOR_LOOP_OVER_FALLIBLE), + LintId::of(&loops::FOR_LOOPS_OVER_FALLIBLES), LintId::of(&loops::ITER_NEXT_LOOP), LintId::of(&loops::MANUAL_MEMCPY), LintId::of(&loops::MUT_RANGE_BOUND), @@ -1444,7 +1444,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&attrs::UNKNOWN_CLIPPY_LINTS), LintId::of(&bit_mask::VERBOSE_BIT_MASK), LintId::of(&blacklisted_name::BLACKLISTED_NAME), - LintId::of(&block_in_if_condition::BLOCK_IN_IF_CONDITION), + LintId::of(&blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS), LintId::of(&collapsible_if::COLLAPSIBLE_IF), LintId::of(&comparison_chain::COMPARISON_CHAIN), LintId::of(&doc::MISSING_SAFETY_DOC), @@ -1639,7 +1639,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&inline_fn_without_body::INLINE_FN_WITHOUT_BODY), LintId::of(&let_underscore::LET_UNDERSCORE_LOCK), LintId::of(&literal_representation::MISTYPED_LITERAL_SUFFIXES), - LintId::of(&loops::FOR_LOOP_OVER_FALLIBLE), + LintId::of(&loops::FOR_LOOPS_OVER_FALLIBLES), LintId::of(&loops::ITER_NEXT_LOOP), LintId::of(&loops::NEVER_LOOP), LintId::of(&loops::WHILE_IMMUTABLE_CONDITION), @@ -1785,8 +1785,8 @@ pub fn register_renamed(ls: &mut rustc_lint::LintStore) { ls.register_renamed("clippy::new_without_default_derive", "clippy::new_without_default"); ls.register_renamed("clippy::cyclomatic_complexity", "clippy::cognitive_complexity"); ls.register_renamed("clippy::const_static_lifetime", "clippy::redundant_static_lifetimes"); - ls.register_renamed("clippy::block_in_if_condition_expr", "clippy::block_in_if_condition"); - ls.register_renamed("clippy::block_in_if_condition_stmt", "clippy::block_in_if_condition"); + ls.register_renamed("clippy::block_in_if_condition_expr", "clippy::blocks_in_if_conditions"); + ls.register_renamed("clippy::block_in_if_condition_stmt", "clippy::blocks_in_if_conditions"); ls.register_renamed("clippy::option_map_unwrap_or", "clippy::map_unwrap_or"); ls.register_renamed("clippy::option_map_unwrap_or_else", "clippy::map_unwrap_or"); ls.register_renamed("clippy::result_map_unwrap_or_else", "clippy::map_unwrap_or"); @@ -1794,8 +1794,8 @@ pub fn register_renamed(ls: &mut rustc_lint::LintStore) { ls.register_renamed("clippy::result_unwrap_used", "clippy::unwrap_used"); ls.register_renamed("clippy::option_expect_used", "clippy::expect_used"); ls.register_renamed("clippy::result_expect_used", "clippy::expect_used"); - ls.register_renamed("clippy::for_loop_over_option", "clippy::for_loop_over_fallible"); - ls.register_renamed("clippy::for_loop_over_result", "clippy::for_loop_over_fallible"); + ls.register_renamed("clippy::for_loop_over_option", "clippy::for_loops_over_fallibles"); + ls.register_renamed("clippy::for_loop_over_result", "clippy::for_loops_over_fallibles"); } // only exists to let the dogfood integration test works. diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index da6793a69..9c9d1a840 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -205,7 +205,7 @@ declare_clippy_lint! { /// // .. /// } /// ``` - pub FOR_LOOP_OVER_FALLIBLE, + pub FOR_LOOPS_OVER_FALLIBLES, correctness, "for-looping over an `Option` or a `Result`, which is more clearly expressed as an `if let`" } @@ -426,7 +426,7 @@ declare_lint_pass!(Loops => [ EXPLICIT_ITER_LOOP, EXPLICIT_INTO_ITER_LOOP, ITER_NEXT_LOOP, - FOR_LOOP_OVER_FALLIBLE, + FOR_LOOPS_OVER_FALLIBLES, WHILE_LET_LOOP, NEEDLESS_COLLECT, EXPLICIT_COUNTER_LOOP, @@ -1290,7 +1290,7 @@ fn check_arg_type(cx: &LateContext<'_, '_>, pat: &Pat<'_>, arg: &Expr<'_>) { if is_type_diagnostic_item(cx, ty, sym!(option_type)) { span_lint_and_help( cx, - FOR_LOOP_OVER_FALLIBLE, + FOR_LOOPS_OVER_FALLIBLES, arg.span, &format!( "for loop over `{0}`, which is an `Option`. This is more readably written as an \ @@ -1307,7 +1307,7 @@ fn check_arg_type(cx: &LateContext<'_, '_>, pat: &Pat<'_>, arg: &Expr<'_>) { } else if is_type_diagnostic_item(cx, ty, sym!(result_type)) { span_lint_and_help( cx, - FOR_LOOP_OVER_FALLIBLE, + FOR_LOOPS_OVER_FALLIBLES, arg.span, &format!( "for loop over `{0}`, which is a `Result`. This is more readably written as an \ diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index e90b9c157..feada261a 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -74,11 +74,11 @@ pub static ref ALL_LINTS: Vec = vec![ module: "blacklisted_name", }, Lint { - name: "block_in_if_condition", + name: "blocks_in_if_conditions", group: "style", desc: "useless or complex blocks that can be eliminated in conditions", deprecation: None, - module: "block_in_if_condition", + module: "blocks_in_if_conditions", }, Lint { name: "bool_comparison", @@ -676,7 +676,7 @@ pub static ref ALL_LINTS: Vec = vec![ module: "loops", }, Lint { - name: "for_loop_over_fallible", + name: "for_loops_over_fallibles", group: "correctness", desc: "for-looping over an `Option` or a `Result`, which is more clearly expressed as an `if let`", deprecation: None, diff --git a/tests/ui/block_in_if_condition.fixed b/tests/ui/blocks_in_if_conditions.fixed similarity index 96% rename from tests/ui/block_in_if_condition.fixed rename to tests/ui/blocks_in_if_conditions.fixed index ae01c6d30..9040552ce 100644 --- a/tests/ui/block_in_if_condition.fixed +++ b/tests/ui/blocks_in_if_conditions.fixed @@ -1,5 +1,5 @@ // run-rustfix -#![warn(clippy::block_in_if_condition)] +#![warn(clippy::blocks_in_if_conditions)] #![allow(unused, clippy::let_and_return)] #![warn(clippy::nonminimal_bool)] diff --git a/tests/ui/block_in_if_condition.rs b/tests/ui/blocks_in_if_conditions.rs similarity index 96% rename from tests/ui/block_in_if_condition.rs rename to tests/ui/blocks_in_if_conditions.rs index 88555dc47..2fe409b22 100644 --- a/tests/ui/block_in_if_condition.rs +++ b/tests/ui/blocks_in_if_conditions.rs @@ -1,5 +1,5 @@ // run-rustfix -#![warn(clippy::block_in_if_condition)] +#![warn(clippy::blocks_in_if_conditions)] #![allow(unused, clippy::let_and_return)] #![warn(clippy::nonminimal_bool)] diff --git a/tests/ui/block_in_if_condition.stderr b/tests/ui/blocks_in_if_conditions.stderr similarity index 77% rename from tests/ui/block_in_if_condition.stderr rename to tests/ui/blocks_in_if_conditions.stderr index 89e9ad26f..9bdddc8e1 100644 --- a/tests/ui/block_in_if_condition.stderr +++ b/tests/ui/blocks_in_if_conditions.stderr @@ -1,5 +1,5 @@ error: in an `if` condition, avoid complex blocks or closures with blocks; instead, move the block or closure higher and bind it with a `let` - --> $DIR/block_in_if_condition.rs:26:5 + --> $DIR/blocks_in_if_conditions.rs:26:5 | LL | / if { LL | | let x = 3; @@ -7,7 +7,7 @@ LL | | x == 3 LL | | } { | |_____^ | - = note: `-D clippy::block-in-if-condition` implied by `-D warnings` + = note: `-D clippy::blocks-in-if-conditions` implied by `-D warnings` help: try | LL | let res = { @@ -17,13 +17,13 @@ LL | }; if res { | error: omit braces around single expression condition - --> $DIR/block_in_if_condition.rs:37:8 + --> $DIR/blocks_in_if_conditions.rs:37:8 | LL | if { true } { | ^^^^^^^^ help: try: `true` error: this boolean expression can be simplified - --> $DIR/block_in_if_condition.rs:46:8 + --> $DIR/blocks_in_if_conditions.rs:46:8 | LL | if true && x == 3 { | ^^^^^^^^^^^^^^ help: try: `x == 3` diff --git a/tests/ui/block_in_if_condition_closure.rs b/tests/ui/blocks_in_if_conditions_closure.rs similarity index 95% rename from tests/ui/block_in_if_condition_closure.rs rename to tests/ui/blocks_in_if_conditions_closure.rs index 87b3fb94d..acbabfa20 100644 --- a/tests/ui/block_in_if_condition_closure.rs +++ b/tests/ui/blocks_in_if_conditions_closure.rs @@ -1,4 +1,4 @@ -#![warn(clippy::block_in_if_condition)] +#![warn(clippy::blocks_in_if_conditions)] #![allow(unused, clippy::let_and_return)] fn predicate bool, T>(pfn: F, val: T) -> bool { diff --git a/tests/ui/block_in_if_condition_closure.stderr b/tests/ui/blocks_in_if_conditions_closure.stderr similarity index 78% rename from tests/ui/block_in_if_condition_closure.stderr rename to tests/ui/blocks_in_if_conditions_closure.stderr index 3df25691c..941d604dd 100644 --- a/tests/ui/block_in_if_condition_closure.stderr +++ b/tests/ui/blocks_in_if_conditions_closure.stderr @@ -1,5 +1,5 @@ error: in an `if` condition, avoid complex blocks or closures with blocks; instead, move the block or closure higher and bind it with a `let` - --> $DIR/block_in_if_condition_closure.rs:18:17 + --> $DIR/blocks_in_if_conditions_closure.rs:18:17 | LL | |x| { | _________________^ @@ -8,10 +8,10 @@ LL | | x == target LL | | }, | |_____________^ | - = note: `-D clippy::block-in-if-condition` implied by `-D warnings` + = note: `-D clippy::blocks-in-if-conditions` implied by `-D warnings` error: in an `if` condition, avoid complex blocks or closures with blocks; instead, move the block or closure higher and bind it with a `let` - --> $DIR/block_in_if_condition_closure.rs:27:13 + --> $DIR/blocks_in_if_conditions_closure.rs:27:13 | LL | |x| { | _____________^ diff --git a/tests/ui/for_loop_over_fallible.rs b/tests/ui/for_loops_over_fallibles.rs similarity index 93% rename from tests/ui/for_loop_over_fallible.rs rename to tests/ui/for_loops_over_fallibles.rs index e52468cdd..1b9dde87c 100644 --- a/tests/ui/for_loop_over_fallible.rs +++ b/tests/ui/for_loops_over_fallibles.rs @@ -1,6 +1,6 @@ -#![warn(clippy::for_loop_over_fallible)] +#![warn(clippy::for_loops_over_fallibles)] -fn for_loop_over_fallible() { +fn for_loops_over_fallibles() { let option = Some(1); let result = option.ok_or("x not found"); let v = vec![0, 1, 2]; diff --git a/tests/ui/for_loop_over_fallible.stderr b/tests/ui/for_loops_over_fallibles.stderr similarity index 84% rename from tests/ui/for_loop_over_fallible.stderr rename to tests/ui/for_loops_over_fallibles.stderr index 4ce9a144a..bef228d4b 100644 --- a/tests/ui/for_loop_over_fallible.stderr +++ b/tests/ui/for_loops_over_fallibles.stderr @@ -1,14 +1,14 @@ error: for loop over `option`, which is an `Option`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_fallible.rs:9:14 + --> $DIR/for_loops_over_fallibles.rs:9:14 | LL | for x in option { | ^^^^^^ | - = note: `-D clippy::for-loop-over-fallible` implied by `-D warnings` + = note: `-D clippy::for-loops-over-fallibles` implied by `-D warnings` = help: consider replacing `for x in option` with `if let Some(x) = option` error: for loop over `result`, which is a `Result`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_fallible.rs:14:14 + --> $DIR/for_loops_over_fallibles.rs:14:14 | LL | for x in result { | ^^^^^^ @@ -16,7 +16,7 @@ LL | for x in result { = help: consider replacing `for x in result` with `if let Ok(x) = result` error: for loop over `option.ok_or("x not found")`, which is a `Result`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_fallible.rs:18:14 + --> $DIR/for_loops_over_fallibles.rs:18:14 | LL | for x in option.ok_or("x not found") { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -24,7 +24,7 @@ LL | for x in option.ok_or("x not found") { = help: consider replacing `for x in option.ok_or("x not found")` with `if let Ok(x) = option.ok_or("x not found")` error: you are iterating over `Iterator::next()` which is an Option; this will compile but is probably not what you want - --> $DIR/for_loop_over_fallible.rs:24:14 + --> $DIR/for_loops_over_fallibles.rs:24:14 | LL | for x in v.iter().next() { | ^^^^^^^^^^^^^^^ @@ -32,7 +32,7 @@ LL | for x in v.iter().next() { = note: `#[deny(clippy::iter_next_loop)]` on by default error: for loop over `v.iter().next().and(Some(0))`, which is an `Option`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_fallible.rs:29:14 + --> $DIR/for_loops_over_fallibles.rs:29:14 | LL | for x in v.iter().next().and(Some(0)) { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -40,7 +40,7 @@ LL | for x in v.iter().next().and(Some(0)) { = help: consider replacing `for x in v.iter().next().and(Some(0))` with `if let Some(x) = v.iter().next().and(Some(0))` error: for loop over `v.iter().next().ok_or("x not found")`, which is a `Result`. This is more readably written as an `if let` statement. - --> $DIR/for_loop_over_fallible.rs:33:14 + --> $DIR/for_loops_over_fallibles.rs:33:14 | LL | for x in v.iter().next().ok_or("x not found") { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -48,7 +48,7 @@ LL | for x in v.iter().next().ok_or("x not found") { = help: consider replacing `for x in v.iter().next().ok_or("x not found")` with `if let Ok(x) = v.iter().next().ok_or("x not found")` error: this loop never actually loops - --> $DIR/for_loop_over_fallible.rs:45:5 + --> $DIR/for_loops_over_fallibles.rs:45:5 | LL | / while let Some(x) = option { LL | | println!("{}", x); @@ -59,7 +59,7 @@ LL | | } = note: `#[deny(clippy::never_loop)]` on by default error: this loop never actually loops - --> $DIR/for_loop_over_fallible.rs:51:5 + --> $DIR/for_loops_over_fallibles.rs:51:5 | LL | / while let Ok(x) = result { LL | | println!("{}", x); From fc8ab099c38952b91e38608c386314bde6dd2629 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Fri, 15 May 2020 21:17:37 +0200 Subject: [PATCH 0070/4780] identity_op: allow `1 << 0` --- clippy_lints/src/identity_op.rs | 22 ++++++++++++++++++++-- tests/ui/identity_op.rs | 5 +++++ tests/ui/identity_op.stderr | 20 +++++++++++++++++++- 3 files changed, 44 insertions(+), 3 deletions(-) diff --git a/clippy_lints/src/identity_op.rs b/clippy_lints/src/identity_op.rs index 088e4ab19..78e07d25f 100644 --- a/clippy_lints/src/identity_op.rs +++ b/clippy_lints/src/identity_op.rs @@ -1,4 +1,5 @@ -use rustc_hir::{BinOpKind, Expr, ExprKind}; +use if_chain::if_chain; +use rustc_hir::{BinOp, BinOpKind, Expr, ExprKind}; use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; @@ -32,7 +33,10 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityOp { if e.span.from_expansion() { return; } - if let ExprKind::Binary(ref cmp, ref left, ref right) = e.kind { + if let ExprKind::Binary(cmp, ref left, ref right) = e.kind { + if is_allowed(cx, cmp, left, right) { + return; + } match cmp.node { BinOpKind::Add | BinOpKind::BitOr | BinOpKind::BitXor => { check(cx, left, 0, e.span, right.span); @@ -54,6 +58,20 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityOp { } } +fn is_allowed(cx: &LateContext<'_, '_>, cmp: BinOp, left: &Expr<'_>, right: &Expr<'_>) -> bool { + // `1 << 0` is a common pattern in bit manipulation code + if_chain! { + if let BinOpKind::Shl = cmp.node; + if let Some(Constant::Int(0)) = constant_simple(cx, cx.tables, right); + if let Some(Constant::Int(1)) = constant_simple(cx, cx.tables, left); + then { + return true; + } + } + + false +} + #[allow(clippy::cast_possible_wrap)] fn check(cx: &LateContext<'_, '_>, e: &Expr<'_>, m: i8, span: Span, arg: Span) { if let Some(Constant::Int(v)) = constant_simple(cx, cx.tables, e) { diff --git a/tests/ui/identity_op.rs b/tests/ui/identity_op.rs index ae2815d34..ceaacaaf6 100644 --- a/tests/ui/identity_op.rs +++ b/tests/ui/identity_op.rs @@ -33,4 +33,9 @@ fn main() { let u: u8 = 0; u & 255; + + 1 << 0; // no error, this case is allowed, see issue 3430 + 42 << 0; + 1 >> 0; + 42 >> 0; } diff --git a/tests/ui/identity_op.stderr b/tests/ui/identity_op.stderr index 474287770..d8d44a74f 100644 --- a/tests/ui/identity_op.stderr +++ b/tests/ui/identity_op.stderr @@ -48,5 +48,23 @@ error: the operation is ineffective. Consider reducing it to `u` LL | u & 255; | ^^^^^^^ -error: aborting due to 8 previous errors +error: the operation is ineffective. Consider reducing it to `42` + --> $DIR/identity_op.rs:38:5 + | +LL | 42 << 0; + | ^^^^^^^ + +error: the operation is ineffective. Consider reducing it to `1` + --> $DIR/identity_op.rs:39:5 + | +LL | 1 >> 0; + | ^^^^^^ + +error: the operation is ineffective. Consider reducing it to `42` + --> $DIR/identity_op.rs:40:5 + | +LL | 42 >> 0; + | ^^^^^^^ + +error: aborting due to 11 previous errors From 10313a2631efa6a01dc86199d554ce5a7c1bb51a Mon Sep 17 00:00:00 2001 From: Vardan Margaryan Date: Fri, 15 May 2020 22:33:37 +0300 Subject: [PATCH 0071/4780] Revert "Fix cases of match_wildcard_for_single_variants lint when it is spanned on Option" This reverts commit 494830797744c09d6de3b2b2452ab185d2204005. --- clippy_lints/src/consts.rs | 9 ++++----- clippy_lints/src/escape.rs | 4 ++-- clippy_lints/src/floating_point_arithmetic.rs | 2 +- clippy_lints/src/loops.rs | 2 +- clippy_lints/src/misc.rs | 2 +- clippy_lints/src/modulo_arithmetic.rs | 1 - clippy_lints/src/utils/mod.rs | 2 -- 7 files changed, 9 insertions(+), 13 deletions(-) diff --git a/clippy_lints/src/consts.rs b/clippy_lints/src/consts.rs index efb424bcb..81ddc8c00 100644 --- a/clippy_lints/src/consts.rs +++ b/clippy_lints/src/consts.rs @@ -139,7 +139,6 @@ impl Constant { .find(|r| r.map_or(true, |o| o != Ordering::Equal)) .unwrap_or_else(|| Some(l.len().cmp(&r.len()))), (&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => { - #[allow(clippy::match_wildcard_for_single_variants)] match Self::partial_cmp(tcx, cmp_type, lv, rv) { Some(Equal) => Some(ls.cmp(rs)), x => x, @@ -355,14 +354,14 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> { (Some(Constant::Vec(vec)), Some(Constant::Int(index))) => match vec.get(index as usize) { Some(Constant::F32(x)) => Some(Constant::F32(*x)), Some(Constant::F64(x)) => Some(Constant::F64(*x)), - Some(_) | None => None, + _ => None, }, (Some(Constant::Vec(vec)), _) => { if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) { match vec.get(0) { Some(Constant::F32(x)) => Some(Constant::F32(*x)), Some(Constant::F64(x)) => Some(Constant::F64(*x)), - Some(_) | None => None, + _ => None, } } else { None @@ -533,7 +532,7 @@ pub fn miri_to_const(result: &ty::Const<'_>) -> Option { }) .collect::>>() .map(Constant::Vec), - Some(_) | None => None, + _ => None, }, ty::Float(FloatTy::F64) => match miri_to_const(len) { Some(Constant::Int(len)) => alloc @@ -547,7 +546,7 @@ pub fn miri_to_const(result: &ty::Const<'_>) -> Option { }) .collect::>>() .map(Constant::Vec), - Some(_) | None => None, + _ => None, }, // FIXME: implement other array type conversions. _ => None, diff --git a/clippy_lints/src/escape.rs b/clippy_lints/src/escape.rs index 615afee33..1ec60a0e6 100644 --- a/clippy_lints/src/escape.rs +++ b/clippy_lints/src/escape.rs @@ -95,12 +95,12 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BoxedLocal { fn is_argument(map: rustc_middle::hir::map::Map<'_>, id: HirId) -> bool { match map.find(id) { Some(Node::Binding(_)) => (), - Some(_) | None => return false, + _ => return false, } match map.find(map.get_parent_node(id)) { Some(Node::Param(_)) => true, - Some(_) | None => false, + _ => false, } } diff --git a/clippy_lints/src/floating_point_arithmetic.rs b/clippy_lints/src/floating_point_arithmetic.rs index 8c61b2f86..86317fb8b 100644 --- a/clippy_lints/src/floating_point_arithmetic.rs +++ b/clippy_lints/src/floating_point_arithmetic.rs @@ -410,7 +410,7 @@ fn is_zero(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { Some(Constant::Int(i)) => i == 0, Some(Constant::F32(f)) => f == 0.0, Some(Constant::F64(f)) => f == 0.0, - Some(_) | None => false, + _ => false, } } diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 39908bff5..0bc6b7085 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -2154,7 +2154,7 @@ fn is_loop_nested(cx: &LateContext<'_, '_>, loop_expr: &Expr<'_>, iter_expr: &Ex } }, Some(Node::Stmt(_)) => (), - Some(_) | None => { + _ => { return false; }, } diff --git a/clippy_lints/src/misc.rs b/clippy_lints/src/misc.rs index 38c2645d3..e1d524c22 100644 --- a/clippy_lints/src/misc.rs +++ b/clippy_lints/src/misc.rs @@ -509,7 +509,7 @@ fn is_allowed<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) -> boo Constant::F64(f) => *f == 0.0 || (*f).is_infinite(), _ => false, }), - Some(_) | None => false, + _ => false, } } diff --git a/clippy_lints/src/modulo_arithmetic.rs b/clippy_lints/src/modulo_arithmetic.rs index 3bb3eb15d..4ca90455b 100644 --- a/clippy_lints/src/modulo_arithmetic.rs +++ b/clippy_lints/src/modulo_arithmetic.rs @@ -37,7 +37,6 @@ struct OperandInfo { } fn analyze_operand(operand: &Expr<'_>, cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option { - #[allow(clippy::match_wildcard_for_single_variants)] match constant(cx, cx.tables, operand) { Some((Constant::Int(v), _)) => match cx.tables.expr_ty(expr).kind { ty::Int(ity) => { diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index 7bc8be492..3b8ef18bf 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -370,7 +370,6 @@ pub fn trait_ref_of_method<'tcx>(cx: &LateContext<'_, 'tcx>, hir_id: HirId) -> O /// Checks whether this type implements `Drop`. pub fn has_drop<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, ty: Ty<'tcx>) -> bool { - #[allow(clippy::match_wildcard_for_single_variants)] match ty.ty_adt_def() { Some(def) => def.has_dtor(cx.tcx), _ => false, @@ -445,7 +444,6 @@ pub fn is_entrypoint_fn(cx: &LateContext<'_, '_>, def_id: DefId) -> bool { /// Gets the name of the item the expression is in, if available. pub fn get_item_name(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option { let parent_id = cx.tcx.hir().get_parent_item(expr.hir_id); - #[allow(clippy::match_wildcard_for_single_variants)] match cx.tcx.hir().find(parent_id) { Some( Node::Item(Item { ident, .. }) From 2620d2449da851171773f7bec1396af11babe278 Mon Sep 17 00:00:00 2001 From: Vardan Margaryan Date: Sat, 16 May 2020 00:06:52 +0300 Subject: [PATCH 0072/4780] Fix check for missing enum variants from match expressions TupleStruct matches are checked for exhaustiveness --- clippy_lints/src/matches.rs | 16 ++++++++++++++-- clippy_lints/src/utils/mod.rs | 2 +- 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs index 6fdb4cf9c..7d7228208 100644 --- a/clippy_lints/src/matches.rs +++ b/clippy_lints/src/matches.rs @@ -764,9 +764,21 @@ fn check_wild_enum_match(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_ if let QPath::Resolved(_, p) = path { missing_variants.retain(|e| e.ctor_def_id != Some(p.res.def_id())); } - } else if let PatKind::TupleStruct(ref path, ..) = arm.pat.kind { + } else if let PatKind::TupleStruct(ref path, ref patterns, ..) = arm.pat.kind { if let QPath::Resolved(_, p) = path { - missing_variants.retain(|e| e.ctor_def_id != Some(p.res.def_id())); + // Some simple checks for exhaustive patterns. + // There is a room for improvements to detect more cases, + // but it can be more expensive to do so. + let is_pattern_exhaustive = |pat: &&Pat<'_>| { + if let PatKind::Wild | PatKind::Binding(.., None) = pat.kind { + true + } else { + false + } + }; + if patterns.iter().all(is_pattern_exhaustive) { + missing_variants.retain(|e| e.ctor_def_id != Some(p.res.def_id())); + } } } } diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index 3b8ef18bf..7545235e6 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -372,7 +372,7 @@ pub fn trait_ref_of_method<'tcx>(cx: &LateContext<'_, 'tcx>, hir_id: HirId) -> O pub fn has_drop<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, ty: Ty<'tcx>) -> bool { match ty.ty_adt_def() { Some(def) => def.has_dtor(cx.tcx), - _ => false, + None => false, } } From d90625385e8ed0a9030e3ab2ea0990fce39c28bf Mon Sep 17 00:00:00 2001 From: Vardan Margaryan Date: Sat, 16 May 2020 00:19:30 +0300 Subject: [PATCH 0073/4780] Add more test cases for match_wildcard_for_single_variants --- .../match_wildcard_for_single_variants.fixed | 43 ++++++++++++++++++- .../ui/match_wildcard_for_single_variants.rs | 43 ++++++++++++++++++- .../match_wildcard_for_single_variants.stderr | 22 +++++++++- 3 files changed, 104 insertions(+), 4 deletions(-) diff --git a/tests/ui/match_wildcard_for_single_variants.fixed b/tests/ui/match_wildcard_for_single_variants.fixed index 5f1a559f5..519200977 100644 --- a/tests/ui/match_wildcard_for_single_variants.fixed +++ b/tests/ui/match_wildcard_for_single_variants.fixed @@ -9,10 +9,51 @@ enum Foo { C, } +enum Color { + Red, + Green, + Blue, + Rgb(u8, u8, u8), +} + fn main() { - match Foo::A { + let f = Foo::A; + match f { Foo::A => {}, Foo::B => {}, Foo::C => {}, } + + let color = Color::Red; + + // check exhaustive bindings + match color { + Color::Red => {}, + Color::Green => {}, + Color::Rgb(_r, _g, _b) => {}, + Color::Blue => {}, + } + + // check exhaustive wild + match color { + Color::Red => {}, + Color::Green => {}, + Color::Rgb(..) => {}, + Color::Blue => {}, + } + match color { + Color::Red => {}, + Color::Green => {}, + Color::Rgb(_, _, _) => {}, + Color::Blue => {}, + } + + // shouldn't lint as there is one missing variant + // and one that isn't exhaustively covered + match color { + Color::Red => {}, + Color::Green => {}, + Color::Rgb(255, _, _) => {}, + _ => {}, + } } diff --git a/tests/ui/match_wildcard_for_single_variants.rs b/tests/ui/match_wildcard_for_single_variants.rs index 1159f9e72..1df917e08 100644 --- a/tests/ui/match_wildcard_for_single_variants.rs +++ b/tests/ui/match_wildcard_for_single_variants.rs @@ -9,10 +9,51 @@ enum Foo { C, } +enum Color { + Red, + Green, + Blue, + Rgb(u8, u8, u8), +} + fn main() { - match Foo::A { + let f = Foo::A; + match f { Foo::A => {}, Foo::B => {}, _ => {}, } + + let color = Color::Red; + + // check exhaustive bindings + match color { + Color::Red => {}, + Color::Green => {}, + Color::Rgb(_r, _g, _b) => {}, + _ => {}, + } + + // check exhaustive wild + match color { + Color::Red => {}, + Color::Green => {}, + Color::Rgb(..) => {}, + _ => {}, + } + match color { + Color::Red => {}, + Color::Green => {}, + Color::Rgb(_, _, _) => {}, + _ => {}, + } + + // shouldn't lint as there is one missing variant + // and one that isn't exhaustively covered + match color { + Color::Red => {}, + Color::Green => {}, + Color::Rgb(255, _, _) => {}, + _ => {}, + } } diff --git a/tests/ui/match_wildcard_for_single_variants.stderr b/tests/ui/match_wildcard_for_single_variants.stderr index 128dd4808..82790aa9e 100644 --- a/tests/ui/match_wildcard_for_single_variants.stderr +++ b/tests/ui/match_wildcard_for_single_variants.stderr @@ -1,10 +1,28 @@ error: wildcard match will miss any future added variants - --> $DIR/match_wildcard_for_single_variants.rs:16:9 + --> $DIR/match_wildcard_for_single_variants.rs:24:9 | LL | _ => {}, | ^ help: try this: `Foo::C` | = note: `-D clippy::match-wildcard-for-single-variants` implied by `-D warnings` -error: aborting due to previous error +error: wildcard match will miss any future added variants + --> $DIR/match_wildcard_for_single_variants.rs:34:9 + | +LL | _ => {}, + | ^ help: try this: `Color::Blue` + +error: wildcard match will miss any future added variants + --> $DIR/match_wildcard_for_single_variants.rs:42:9 + | +LL | _ => {}, + | ^ help: try this: `Color::Blue` + +error: wildcard match will miss any future added variants + --> $DIR/match_wildcard_for_single_variants.rs:48:9 + | +LL | _ => {}, + | ^ help: try this: `Color::Blue` + +error: aborting due to 4 previous errors From e55b920970fdc33f5ddaf7757738fbacdadf15ab Mon Sep 17 00:00:00 2001 From: ThibsG Date: Mon, 4 May 2020 17:09:02 +0200 Subject: [PATCH 0074/4780] Rename lint `identity_conversion` to `useless_conversion` --- CHANGELOG.md | 4 +- clippy_lints/src/lib.rs | 11 +++-- ...ty_conversion.rs => useless_conversion.rs} | 30 +++++++----- src/lintlist/mod.rs | 14 +++--- ...version.fixed => useless_conversion.fixed} | 4 +- ...ty_conversion.rs => useless_conversion.rs} | 4 +- ...rsion.stderr => useless_conversion.stderr} | 46 +++++++++---------- 7 files changed, 60 insertions(+), 53 deletions(-) rename clippy_lints/src/{identity_conversion.rs => useless_conversion.rs} (84%) rename tests/ui/{identity_conversion.fixed => useless_conversion.fixed} (93%) rename tests/ui/{identity_conversion.rs => useless_conversion.rs} (94%) rename tests/ui/{identity_conversion.stderr => useless_conversion.stderr} (67%) diff --git a/CHANGELOG.md b/CHANGELOG.md index d05819a97..9e85e6da3 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -805,7 +805,7 @@ Released 2018-09-13 ## 0.0.166 * Rustup to *rustc 1.22.0-nightly (b7960878b 2017-10-18)* -* New lints: [`explicit_write`], [`identity_conversion`], [`implicit_hasher`], [`invalid_ref`], [`option_map_or_none`], +* New lints: [`explicit_write`], `identity_conversion`, [`implicit_hasher`], [`invalid_ref`], [`option_map_or_none`], [`range_minus_one`], [`range_plus_one`], [`transmute_int_to_bool`], [`transmute_int_to_char`], [`transmute_int_to_float`] @@ -1367,7 +1367,6 @@ Released 2018-09-13 [`future_not_send`]: https://rust-lang.github.io/rust-clippy/master/index.html#future_not_send [`get_last_with_len`]: https://rust-lang.github.io/rust-clippy/master/index.html#get_last_with_len [`get_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap -[`identity_conversion`]: https://rust-lang.github.io/rust-clippy/master/index.html#identity_conversion [`identity_op`]: https://rust-lang.github.io/rust-clippy/master/index.html#identity_op [`if_let_mutex`]: https://rust-lang.github.io/rust-clippy/master/index.html#if_let_mutex [`if_let_redundant_pattern_matching`]: https://rust-lang.github.io/rust-clippy/master/index.html#if_let_redundant_pattern_matching @@ -1624,6 +1623,7 @@ Released 2018-09-13 [`used_underscore_binding`]: https://rust-lang.github.io/rust-clippy/master/index.html#used_underscore_binding [`useless_asref`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref [`useless_attribute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_attribute +[`useless_conversion`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion [`useless_format`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_format [`useless_let_if_seq`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq [`useless_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_transmute diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index bda0d5c04..4dda37373 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -221,7 +221,6 @@ mod formatting; mod functions; mod future_not_send; mod get_last_with_len; -mod identity_conversion; mod identity_op; mod if_let_mutex; mod if_let_some_result; @@ -324,6 +323,7 @@ mod unused_io_amount; mod unused_self; mod unwrap; mod use_self; +mod useless_conversion; mod vec; mod verbose_file_reads; mod wildcard_dependencies; @@ -577,7 +577,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &functions::TOO_MANY_LINES, &future_not_send::FUTURE_NOT_SEND, &get_last_with_len::GET_LAST_WITH_LEN, - &identity_conversion::IDENTITY_CONVERSION, &identity_op::IDENTITY_OP, &if_let_mutex::IF_LET_MUTEX, &if_let_some_result::IF_LET_SOME_RESULT, @@ -843,6 +842,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &unwrap::PANICKING_UNWRAP, &unwrap::UNNECESSARY_UNWRAP, &use_self::USE_SELF, + &useless_conversion::USELESS_CONVERSION, &utils::internal_lints::CLIPPY_LINTS_INTERNAL, &utils::internal_lints::COLLAPSIBLE_SPAN_LINT_CALLS, &utils::internal_lints::COMPILER_LINT_FUNCTIONS, @@ -980,7 +980,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box bytecount::ByteCount); store.register_late_pass(|| box infinite_iter::InfiniteIter); store.register_late_pass(|| box inline_fn_without_body::InlineFnWithoutBody); - store.register_late_pass(|| box identity_conversion::IdentityConversion::default()); + store.register_late_pass(|| box useless_conversion::UselessConversion::default()); store.register_late_pass(|| box types::ImplicitHasher); store.register_late_pass(|| box fallible_impl_from::FallibleImplFrom); store.register_late_pass(|| box types::UnitArg); @@ -1241,7 +1241,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&functions::NOT_UNSAFE_PTR_ARG_DEREF), LintId::of(&functions::TOO_MANY_ARGUMENTS), LintId::of(&get_last_with_len::GET_LAST_WITH_LEN), - LintId::of(&identity_conversion::IDENTITY_CONVERSION), LintId::of(&identity_op::IDENTITY_OP), LintId::of(&if_let_mutex::IF_LET_MUTEX), LintId::of(&if_let_some_result::IF_LET_SOME_RESULT), @@ -1427,6 +1426,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&unused_io_amount::UNUSED_IO_AMOUNT), LintId::of(&unwrap::PANICKING_UNWRAP), LintId::of(&unwrap::UNNECESSARY_UNWRAP), + LintId::of(&useless_conversion::USELESS_CONVERSION), LintId::of(&vec::USELESS_VEC), LintId::of(&write::PRINTLN_EMPTY_STRING), LintId::of(&write::PRINT_LITERAL), @@ -1546,7 +1546,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&format::USELESS_FORMAT), LintId::of(&functions::TOO_MANY_ARGUMENTS), LintId::of(&get_last_with_len::GET_LAST_WITH_LEN), - LintId::of(&identity_conversion::IDENTITY_CONVERSION), LintId::of(&identity_op::IDENTITY_OP), LintId::of(&int_plus_one::INT_PLUS_ONE), LintId::of(&lifetimes::EXTRA_UNUSED_LIFETIMES), @@ -1605,6 +1604,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&types::UNNECESSARY_CAST), LintId::of(&types::VEC_BOX), LintId::of(&unwrap::UNNECESSARY_UNWRAP), + LintId::of(&useless_conversion::USELESS_CONVERSION), LintId::of(&zero_div_zero::ZERO_DIVIDED_BY_ZERO), ]); @@ -1795,6 +1795,7 @@ pub fn register_renamed(ls: &mut rustc_lint::LintStore) { ls.register_renamed("clippy::result_expect_used", "clippy::expect_used"); ls.register_renamed("clippy::for_loop_over_option", "clippy::for_loops_over_fallibles"); ls.register_renamed("clippy::for_loop_over_result", "clippy::for_loops_over_fallibles"); + ls.register_renamed("clippy::identity_conversion", "clippy::useless_conversion"); } // only exists to let the dogfood integration test works. diff --git a/clippy_lints/src/identity_conversion.rs b/clippy_lints/src/useless_conversion.rs similarity index 84% rename from clippy_lints/src/identity_conversion.rs rename to clippy_lints/src/useless_conversion.rs index 33a9478f0..959215189 100644 --- a/clippy_lints/src/identity_conversion.rs +++ b/clippy_lints/src/useless_conversion.rs @@ -7,30 +7,36 @@ use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_tool_lint, impl_lint_pass}; declare_clippy_lint! { - /// **What it does:** Checks for always-identical `Into`/`From`/`IntoIter` conversions. + /// **What it does:** Checks for `Into`/`From`/`IntoIter` calls that useless converts + /// to the same type as caller. /// /// **Why is this bad?** Redundant code. /// /// **Known problems:** None. /// /// **Example:** + /// /// ```rust + /// // Bad /// // format!() returns a `String` /// let s: String = format!("hello").into(); + /// + /// // Good + /// let s: String = format!("hello"); /// ``` - pub IDENTITY_CONVERSION, + pub USELESS_CONVERSION, complexity, - "using always-identical `Into`/`From`/`IntoIter` conversions" + "calls to `Into`/`From`/`IntoIter` that performs useless conversions to the same type" } #[derive(Default)] -pub struct IdentityConversion { +pub struct UselessConversion { try_desugar_arm: Vec, } -impl_lint_pass!(IdentityConversion => [IDENTITY_CONVERSION]); +impl_lint_pass!(UselessConversion => [USELESS_CONVERSION]); -impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion { +impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr<'_>) { if e.span.from_expansion() { return; @@ -60,9 +66,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion { span_lint_and_sugg( cx, - IDENTITY_CONVERSION, + USELESS_CONVERSION, e.span, - "identical conversion", + "useless conversion", "consider removing `.into()`", sugg, Applicability::MachineApplicable, // snippet @@ -76,9 +82,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion { let sugg = snippet(cx, args[0].span, "").into_owned(); span_lint_and_sugg( cx, - IDENTITY_CONVERSION, + USELESS_CONVERSION, e.span, - "identical conversion", + "useless conversion", "consider removing `.into_iter()`", sugg, Applicability::MachineApplicable, // snippet @@ -99,9 +105,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion { format!("consider removing `{}()`", snippet(cx, path.span, "From::from")); span_lint_and_sugg( cx, - IDENTITY_CONVERSION, + USELESS_CONVERSION, e.span, - "identical conversion", + "useless conversion", &sugg_msg, sugg, Applicability::MachineApplicable, // snippet diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index e5e3bf453..e411e6078 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -717,13 +717,6 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "methods", }, - Lint { - name: "identity_conversion", - group: "complexity", - desc: "using always-identical `Into`/`From`/`IntoIter` conversions", - deprecation: None, - module: "identity_conversion", - }, Lint { name: "identity_op", group: "complexity", @@ -2418,6 +2411,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "attrs", }, + Lint { + name: "useless_conversion", + group: "complexity", + desc: "calls to `Into`/`From`/`IntoIter` that performs useless conversions to the same type", + deprecation: None, + module: "useless_conversion", + }, Lint { name: "useless_format", group: "complexity", diff --git a/tests/ui/identity_conversion.fixed b/tests/ui/useless_conversion.fixed similarity index 93% rename from tests/ui/identity_conversion.fixed rename to tests/ui/useless_conversion.fixed index dd3fc56e9..fdd4bc581 100644 --- a/tests/ui/identity_conversion.fixed +++ b/tests/ui/useless_conversion.fixed @@ -1,6 +1,6 @@ // run-rustfix -#![deny(clippy::identity_conversion)] +#![deny(clippy::useless_conversion)] fn test_generic(val: T) -> T { let _ = val; @@ -41,7 +41,7 @@ fn main() { let _: String = "foo".into(); let _: String = From::from("foo"); let _ = String::from("foo"); - #[allow(clippy::identity_conversion)] + #[allow(clippy::useless_conversion)] { let _: String = "foo".into(); let _ = String::from("foo"); diff --git a/tests/ui/identity_conversion.rs b/tests/ui/useless_conversion.rs similarity index 94% rename from tests/ui/identity_conversion.rs rename to tests/ui/useless_conversion.rs index 875ed7db3..4cae745e7 100644 --- a/tests/ui/identity_conversion.rs +++ b/tests/ui/useless_conversion.rs @@ -1,6 +1,6 @@ // run-rustfix -#![deny(clippy::identity_conversion)] +#![deny(clippy::useless_conversion)] fn test_generic(val: T) -> T { let _ = T::from(val); @@ -41,7 +41,7 @@ fn main() { let _: String = "foo".into(); let _: String = From::from("foo"); let _ = String::from("foo"); - #[allow(clippy::identity_conversion)] + #[allow(clippy::useless_conversion)] { let _: String = "foo".into(); let _ = String::from("foo"); diff --git a/tests/ui/identity_conversion.stderr b/tests/ui/useless_conversion.stderr similarity index 67% rename from tests/ui/identity_conversion.stderr rename to tests/ui/useless_conversion.stderr index 57626b237..7df3507ed 100644 --- a/tests/ui/identity_conversion.stderr +++ b/tests/ui/useless_conversion.stderr @@ -1,65 +1,65 @@ -error: identical conversion - --> $DIR/identity_conversion.rs:6:13 +error: useless conversion + --> $DIR/useless_conversion.rs:6:13 | LL | let _ = T::from(val); | ^^^^^^^^^^^^ help: consider removing `T::from()`: `val` | note: the lint level is defined here - --> $DIR/identity_conversion.rs:3:9 + --> $DIR/useless_conversion.rs:3:9 | -LL | #![deny(clippy::identity_conversion)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | #![deny(clippy::useless_conversion)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: identical conversion - --> $DIR/identity_conversion.rs:7:5 +error: useless conversion + --> $DIR/useless_conversion.rs:7:5 | LL | val.into() | ^^^^^^^^^^ help: consider removing `.into()`: `val` -error: identical conversion - --> $DIR/identity_conversion.rs:19:22 +error: useless conversion + --> $DIR/useless_conversion.rs:19:22 | LL | let _: i32 = 0i32.into(); | ^^^^^^^^^^^ help: consider removing `.into()`: `0i32` -error: identical conversion - --> $DIR/identity_conversion.rs:51:21 +error: useless conversion + --> $DIR/useless_conversion.rs:51:21 | LL | let _: String = "foo".to_string().into(); | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `"foo".to_string()` -error: identical conversion - --> $DIR/identity_conversion.rs:52:21 +error: useless conversion + --> $DIR/useless_conversion.rs:52:21 | LL | let _: String = From::from("foo".to_string()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `From::from()`: `"foo".to_string()` -error: identical conversion - --> $DIR/identity_conversion.rs:53:13 +error: useless conversion + --> $DIR/useless_conversion.rs:53:13 | LL | let _ = String::from("foo".to_string()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `"foo".to_string()` -error: identical conversion - --> $DIR/identity_conversion.rs:54:13 +error: useless conversion + --> $DIR/useless_conversion.rs:54:13 | LL | let _ = String::from(format!("A: {:04}", 123)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("A: {:04}", 123)` -error: identical conversion - --> $DIR/identity_conversion.rs:55:13 +error: useless conversion + --> $DIR/useless_conversion.rs:55:13 | LL | let _ = "".lines().into_iter(); | ^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `"".lines()` -error: identical conversion - --> $DIR/identity_conversion.rs:56:13 +error: useless conversion + --> $DIR/useless_conversion.rs:56:13 | LL | let _ = vec![1, 2, 3].into_iter().into_iter(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `vec![1, 2, 3].into_iter()` -error: identical conversion - --> $DIR/identity_conversion.rs:57:21 +error: useless conversion + --> $DIR/useless_conversion.rs:57:21 | LL | let _: String = format!("Hello {}", "world").into(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `format!("Hello {}", "world")` From cb7f9679a63075b3fce2fdc69f7b02fe0f482464 Mon Sep 17 00:00:00 2001 From: Aleksei Latyshev Date: Sat, 25 Apr 2020 20:52:00 +0300 Subject: [PATCH 0075/4780] simplify multispan_sugg interface - add `multispan_sugg_with_applicability` - not it gets `&str` instead of `String`, like in `diag.multispan_suggestion` --- clippy_lints/src/eq_op.rs | 2 +- clippy_lints/src/loops.rs | 4 ++-- clippy_lints/src/matches.rs | 2 +- clippy_lints/src/needless_pass_by_value.rs | 2 +- clippy_lints/src/types.rs | 2 +- clippy_lints/src/utils/diagnostics.rs | 28 +++++++++++----------- 6 files changed, 20 insertions(+), 20 deletions(-) diff --git a/clippy_lints/src/eq_op.rs b/clippy_lints/src/eq_op.rs index 098d47bdd..4e1c1f131 100644 --- a/clippy_lints/src/eq_op.rs +++ b/clippy_lints/src/eq_op.rs @@ -115,7 +115,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for EqOp { let rsnip = snippet(cx, r.span, "...").to_string(); multispan_sugg( diag, - "use the values directly".to_string(), + "use the values directly", vec![(left.span, lsnip), (right.span, rsnip)], ); }, diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 9c9d1a840..4a9c411d7 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -1134,7 +1134,7 @@ fn check_for_loop_range<'a, 'tcx>( |diag| { multispan_sugg( diag, - "consider using an iterator".to_string(), + "consider using an iterator", vec![ (pat.span, format!("({}, )", ident.name)), ( @@ -1163,7 +1163,7 @@ fn check_for_loop_range<'a, 'tcx>( |diag| { multispan_sugg( diag, - "consider using an iterator".to_string(), + "consider using an iterator", vec![(pat.span, "".to_string()), (arg.span, repl)], ); }, diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs index 8f86535ef..bbf14374a 100644 --- a/clippy_lints/src/matches.rs +++ b/clippy_lints/src/matches.rs @@ -820,7 +820,7 @@ fn check_match_ref_pats(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_> span_lint_and_then(cx, MATCH_REF_PATS, expr.span, title, |diag| { if !expr.span.from_expansion() { - multispan_sugg(diag, msg.to_owned(), suggs); + multispan_sugg(diag, msg, suggs); } }); } diff --git a/clippy_lints/src/needless_pass_by_value.rs b/clippy_lints/src/needless_pass_by_value.rs index a21818701..ed48ab548 100644 --- a/clippy_lints/src/needless_pass_by_value.rs +++ b/clippy_lints/src/needless_pass_by_value.rs @@ -293,7 +293,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue { ); spans.sort_by_key(|&(span, _)| span); } - multispan_sugg(diag, "consider taking a reference instead".to_string(), spans); + multispan_sugg(diag, "consider taking a reference instead", spans); }; span_lint_and_then( diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index 6d49f50d5..f50adbc48 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -2206,7 +2206,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ImplicitHasher { multispan_sugg( diag, - "consider adding a type parameter".to_string(), + "consider adding a type parameter", vec![ ( generics_suggestion_span, diff --git a/clippy_lints/src/utils/diagnostics.rs b/clippy_lints/src/utils/diagnostics.rs index 24a1bdf18..f6d87c853 100644 --- a/clippy_lints/src/utils/diagnostics.rs +++ b/clippy_lints/src/utils/diagnostics.rs @@ -1,6 +1,6 @@ //! Clippy wrappers around rustc's diagnostic functions. -use rustc_errors::{Applicability, CodeSuggestion, DiagnosticBuilder, Substitution, SubstitutionPart, SuggestionStyle}; +use rustc_errors::{Applicability, DiagnosticBuilder}; use rustc_hir::HirId; use rustc_lint::{LateContext, Lint, LintContext}; use rustc_span::source_map::{MultiSpan, Span}; @@ -198,20 +198,20 @@ pub fn span_lint_and_sugg<'a, T: LintContext>( /// appear once per /// replacement. In human-readable format though, it only appears once before /// the whole suggestion. -pub fn multispan_sugg(diag: &mut DiagnosticBuilder<'_>, help_msg: String, sugg: I) +pub fn multispan_sugg(diag: &mut DiagnosticBuilder<'_>, help_msg: &str, sugg: I) where I: IntoIterator, { - let sugg = CodeSuggestion { - substitutions: vec![Substitution { - parts: sugg - .into_iter() - .map(|(span, snippet)| SubstitutionPart { snippet, span }) - .collect(), - }], - msg: help_msg, - style: SuggestionStyle::ShowCode, - applicability: Applicability::Unspecified, - }; - diag.suggestions.push(sugg); + multispan_sugg_with_applicability(diag, help_msg, Applicability::Unspecified, sugg) +} + +pub fn multispan_sugg_with_applicability( + diag: &mut DiagnosticBuilder<'_>, + help_msg: &str, + applicability: Applicability, + sugg: I, +) where + I: IntoIterator, +{ + diag.multipart_suggestion(help_msg, sugg.into_iter().collect(), applicability); } From 404ae5b211c9fb3960b64ecbf91d903d484b0c20 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Sun, 17 May 2020 01:14:28 +0200 Subject: [PATCH 0076/4780] Re-remove util/dev Maybe someday, git subtree will do it right --- util/dev | 7 ------- 1 file changed, 7 deletions(-) delete mode 100755 util/dev diff --git a/util/dev b/util/dev deleted file mode 100755 index 319de217e..000000000 --- a/util/dev +++ /dev/null @@ -1,7 +0,0 @@ -#!/bin/sh -CARGO_TARGET_DIR=$(pwd)/target/ -export CARGO_TARGET_DIR - -echo 'Deprecated! `util/dev` usage is deprecated, please use `cargo dev` instead.' - -cd clippy_dev && cargo run -- "$@" From 7f317b708fe0889c04b7590ba53f3a41afa44a1d Mon Sep 17 00:00:00 2001 From: flip1995 Date: Sun, 17 May 2020 01:18:43 +0200 Subject: [PATCH 0077/4780] Run fmt --- src/driver.rs | 228 +++++++++++++++++++++++++------------------------- 1 file changed, 113 insertions(+), 115 deletions(-) diff --git a/src/driver.rs b/src/driver.rs index 1ce0300f2..d3a7e2493 100644 --- a/src/driver.rs +++ b/src/driver.rs @@ -295,121 +295,119 @@ fn toolchain_path(home: Option, toolchain: Option) -> Option = env::args().collect(); + exit(rustc_driver::catch_with_exit_code(move || { + let mut orig_args: Vec = env::args().collect(); - if orig_args.iter().any(|a| a == "--version" || a == "-V") { - let version_info = rustc_tools_util::get_version_info!(); - println!("{}", version_info); - exit(0); + if orig_args.iter().any(|a| a == "--version" || a == "-V") { + let version_info = rustc_tools_util::get_version_info!(); + println!("{}", version_info); + exit(0); + } + + // Get the sysroot, looking from most specific to this invocation to the least: + // - command line + // - runtime environment + // - SYSROOT + // - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN + // - sysroot from rustc in the path + // - compile-time environment + // - SYSROOT + // - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN + let sys_root_arg = arg_value(&orig_args, "--sysroot", |_| true); + let have_sys_root_arg = sys_root_arg.is_some(); + let sys_root = sys_root_arg + .map(PathBuf::from) + .or_else(|| std::env::var("SYSROOT").ok().map(PathBuf::from)) + .or_else(|| { + let home = std::env::var("RUSTUP_HOME") + .or_else(|_| std::env::var("MULTIRUST_HOME")) + .ok(); + let toolchain = std::env::var("RUSTUP_TOOLCHAIN") + .or_else(|_| std::env::var("MULTIRUST_TOOLCHAIN")) + .ok(); + toolchain_path(home, toolchain) + }) + .or_else(|| { + Command::new("rustc") + .arg("--print") + .arg("sysroot") + .output() + .ok() + .and_then(|out| String::from_utf8(out.stdout).ok()) + .map(|s| PathBuf::from(s.trim())) + }) + .or_else(|| option_env!("SYSROOT").map(PathBuf::from)) + .or_else(|| { + let home = option_env!("RUSTUP_HOME") + .or(option_env!("MULTIRUST_HOME")) + .map(ToString::to_string); + let toolchain = option_env!("RUSTUP_TOOLCHAIN") + .or(option_env!("MULTIRUST_TOOLCHAIN")) + .map(ToString::to_string); + toolchain_path(home, toolchain) + }) + .map(|pb| pb.to_string_lossy().to_string()) + .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust"); + + // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument. + // We're invoking the compiler programmatically, so we ignore this/ + let wrapper_mode = orig_args.get(1).map(Path::new).and_then(Path::file_stem) == Some("rustc".as_ref()); + + if wrapper_mode { + // we still want to be able to invoke it normally though + orig_args.remove(1); + } + + if !wrapper_mode && (orig_args.iter().any(|a| a == "--help" || a == "-h") || orig_args.len() == 1) { + display_help(); + exit(0); + } + + let should_describe_lints = || { + let args: Vec<_> = env::args().collect(); + args.windows(2).any(|args| { + args[1] == "help" + && match args[0].as_str() { + "-W" | "-A" | "-D" | "-F" => true, + _ => false, + } + }) + }; + + if !wrapper_mode && should_describe_lints() { + describe_lints(); + exit(0); + } + + // this conditional check for the --sysroot flag is there so users can call + // `clippy_driver` directly + // without having to pass --sysroot or anything + let mut args: Vec = orig_args.clone(); + if !have_sys_root_arg { + args.extend(vec!["--sysroot".into(), sys_root]); + }; + + // this check ensures that dependencies are built but not linted and the final + // crate is linted but not built + let clippy_enabled = env::var("CLIPPY_TESTS").map_or(false, |val| val == "true") + || arg_value(&orig_args, "--cap-lints", |val| val == "allow").is_none(); + + if clippy_enabled { + args.extend(vec!["--cfg".into(), r#"feature="cargo-clippy""#.into()]); + if let Ok(extra_args) = env::var("CLIPPY_ARGS") { + args.extend(extra_args.split("__CLIPPY_HACKERY__").filter_map(|s| { + if s.is_empty() { + None + } else { + Some(s.to_string()) + } + })); } - - // Get the sysroot, looking from most specific to this invocation to the least: - // - command line - // - runtime environment - // - SYSROOT - // - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN - // - sysroot from rustc in the path - // - compile-time environment - // - SYSROOT - // - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN - let sys_root_arg = arg_value(&orig_args, "--sysroot", |_| true); - let have_sys_root_arg = sys_root_arg.is_some(); - let sys_root = sys_root_arg - .map(PathBuf::from) - .or_else(|| std::env::var("SYSROOT").ok().map(PathBuf::from)) - .or_else(|| { - let home = std::env::var("RUSTUP_HOME") - .or_else(|_| std::env::var("MULTIRUST_HOME")) - .ok(); - let toolchain = std::env::var("RUSTUP_TOOLCHAIN") - .or_else(|_| std::env::var("MULTIRUST_TOOLCHAIN")) - .ok(); - toolchain_path(home, toolchain) - }) - .or_else(|| { - Command::new("rustc") - .arg("--print") - .arg("sysroot") - .output() - .ok() - .and_then(|out| String::from_utf8(out.stdout).ok()) - .map(|s| PathBuf::from(s.trim())) - }) - .or_else(|| option_env!("SYSROOT").map(PathBuf::from)) - .or_else(|| { - let home = option_env!("RUSTUP_HOME") - .or(option_env!("MULTIRUST_HOME")) - .map(ToString::to_string); - let toolchain = option_env!("RUSTUP_TOOLCHAIN") - .or(option_env!("MULTIRUST_TOOLCHAIN")) - .map(ToString::to_string); - toolchain_path(home, toolchain) - }) - .map(|pb| pb.to_string_lossy().to_string()) - .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust"); - - // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument. - // We're invoking the compiler programmatically, so we ignore this/ - let wrapper_mode = orig_args.get(1).map(Path::new).and_then(Path::file_stem) == Some("rustc".as_ref()); - - if wrapper_mode { - // we still want to be able to invoke it normally though - orig_args.remove(1); - } - - if !wrapper_mode && (orig_args.iter().any(|a| a == "--help" || a == "-h") || orig_args.len() == 1) { - display_help(); - exit(0); - } - - let should_describe_lints = || { - let args: Vec<_> = env::args().collect(); - args.windows(2).any(|args| { - args[1] == "help" - && match args[0].as_str() { - "-W" | "-A" | "-D" | "-F" => true, - _ => false, - } - }) - }; - - if !wrapper_mode && should_describe_lints() { - describe_lints(); - exit(0); - } - - // this conditional check for the --sysroot flag is there so users can call - // `clippy_driver` directly - // without having to pass --sysroot or anything - let mut args: Vec = orig_args.clone(); - if !have_sys_root_arg { - args.extend(vec!["--sysroot".into(), sys_root]); - }; - - // this check ensures that dependencies are built but not linted and the final - // crate is linted but not built - let clippy_enabled = env::var("CLIPPY_TESTS").map_or(false, |val| val == "true") - || arg_value(&orig_args, "--cap-lints", |val| val == "allow").is_none(); - - if clippy_enabled { - args.extend(vec!["--cfg".into(), r#"feature="cargo-clippy""#.into()]); - if let Ok(extra_args) = env::var("CLIPPY_ARGS") { - args.extend(extra_args.split("__CLIPPY_HACKERY__").filter_map(|s| { - if s.is_empty() { - None - } else { - Some(s.to_string()) - } - })); - } - } - let mut clippy = ClippyCallbacks; - let mut default = DefaultCallbacks; - let callbacks: &mut (dyn rustc_driver::Callbacks + Send) = - if clippy_enabled { &mut clippy } else { &mut default }; - rustc_driver::run_compiler(&args, callbacks, None, None) - }) - ) + } + let mut clippy = ClippyCallbacks; + let mut default = DefaultCallbacks; + let callbacks: &mut (dyn rustc_driver::Callbacks + Send) = + if clippy_enabled { &mut clippy } else { &mut default }; + rustc_driver::run_compiler(&args, callbacks, None, None) + })) } From e5b5f6f8a99253560096a5718fc7fc81daa23e02 Mon Sep 17 00:00:00 2001 From: Philipp Krones Date: Sun, 17 May 2020 01:38:01 +0200 Subject: [PATCH 0078/4780] Better explain remotes in the sync process. --- CONTRIBUTING.md | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index f7a609383..6697ff2f4 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -166,15 +166,18 @@ Clippy in the `rust-lang/rust` repository. For general information about `subtree`s in the Rust repository see [Rust's `CONTRIBUTING.md`][subtree]. -Here is a TL;DR version of the sync process: +Here is a TL;DR version of the sync process (all of the following commands have +to be run inside the `rust` directory): -1. Clone the [`rust-lang/rust`] repository (all of the following commands have - to be run inside the `rust` directory) +1. Clone the [`rust-lang/rust`] repository 2. Sync the changes to the rust-copy of Clippy to your Clippy fork: ```bash # Make sure to change `your-github-name` to your github name in the following command git subtree push -P src/tools/clippy git@github.com:your-github-name/rust-clippy sync-from-rust ``` + _Note:_ This will directly push to the remote repository. You can also push + to your local copy by replacing the remote address with `/path/to/rust-clippy` + directory. 3. Open a PR to `rust-lang/rust-clippy` and wait for it to get merged (to accelerate the process ping the `@rust-lang/clippy` team in your PR and/or ~~annoy~~ ask them in the [Discord] channel.) @@ -185,6 +188,27 @@ Here is a TL;DR version of the sync process: ``` 5. Open a PR to [`rust-lang/rust`] +Also, you may want to define remotes, so you don't have to type out the remote +addresses on every sync. You can do this with the following commands (these +commands still have to be run inside the `rust` directory): + +```bash +# Set clippy-upstream remote for pulls +$ git remote add clippy-upstream https://github.com/rust-lang/rust-clippy +# Make sure to not push to the upstream repo +$ git remote set-url --push clippy-upstream DISABLED +# Set clippy-origin remote to your fork for pushes +$ git remote add clippy-origin git@github.com:your-github-name/rust-clippy +# Set a local remote +$ git remote add clippy-local /path/to/rust-clippy +``` + +You can then sync with the remote names from above, e.g.: + +```bash +$ git subtree push -P src/tools/clippy clippy-local sync-from-rust +``` + [subtree]: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#external-dependencies-subtree [`rust-lang/rust`]: https://github.com/rust-lang/rust From 07f1edf2d43efa0ef53e5b6c56c895bc9738ab94 Mon Sep 17 00:00:00 2001 From: Aleksei Latyshev Date: Sat, 25 Apr 2020 23:33:11 +0300 Subject: [PATCH 0079/4780] improve and generalize `option_and_then_some` lint - rename it to bind_instead_of_map --- CHANGELOG.md | 4 +- clippy_lints/src/lib.rs | 7 +- clippy_lints/src/loops.rs | 2 +- .../src/methods/bind_instead_of_map.rs | 309 ++++++++++++++++++ clippy_lints/src/methods/mod.rs | 100 ++---- clippy_lints/src/types.rs | 2 +- src/lintlist/mod.rs | 14 +- ...n_some.fixed => bind_instead_of_map.fixed} | 4 +- ...nd_then_some.rs => bind_instead_of_map.rs} | 2 +- ...some.stderr => bind_instead_of_map.stderr} | 18 +- tests/ui/bind_instead_of_map_multipart.rs | 61 ++++ tests/ui/bind_instead_of_map_multipart.stderr | 73 +++++ tests/ui/blocks_in_if_conditions.fixed | 4 +- tests/ui/blocks_in_if_conditions.rs | 4 +- tests/ui/option_map_or_none.fixed | 2 +- tests/ui/option_map_or_none.rs | 2 +- 16 files changed, 503 insertions(+), 105 deletions(-) create mode 100644 clippy_lints/src/methods/bind_instead_of_map.rs rename tests/ui/{option_and_then_some.fixed => bind_instead_of_map.fixed} (90%) rename tests/ui/{option_and_then_some.rs => bind_instead_of_map.rs} (94%) rename tests/ui/{option_and_then_some.stderr => bind_instead_of_map.stderr} (50%) create mode 100644 tests/ui/bind_instead_of_map_multipart.rs create mode 100644 tests/ui/bind_instead_of_map_multipart.stderr diff --git a/CHANGELOG.md b/CHANGELOG.md index d05819a97..7abefe654 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -315,7 +315,7 @@ Released 2019-11-07 * [`missing_safety_doc`] [#4535](https://github.com/rust-lang/rust-clippy/pull/4535) * [`mem_replace_with_uninit`] [#4511](https://github.com/rust-lang/rust-clippy/pull/4511) * [`suspicious_map`] [#4394](https://github.com/rust-lang/rust-clippy/pull/4394) - * [`option_and_then_some`] [#4386](https://github.com/rust-lang/rust-clippy/pull/4386) + * `option_and_then_some` [#4386](https://github.com/rust-lang/rust-clippy/pull/4386) * [`manual_saturating_arithmetic`] [#4498](https://github.com/rust-lang/rust-clippy/pull/4498) * Deprecate `unused_collect` lint. This is fully covered by rustc's `#[must_use]` on `collect` [#4348](https://github.com/rust-lang/rust-clippy/pull/4348) * Move `type_repetition_in_bounds` to pedantic group [#4403](https://github.com/rust-lang/rust-clippy/pull/4403) @@ -1273,6 +1273,7 @@ Released 2018-09-13 [`assign_ops`]: https://rust-lang.github.io/rust-clippy/master/index.html#assign_ops [`await_holding_lock`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_lock [`bad_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#bad_bit_mask +[`bind_instead_of_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#bind_instead_of_map [`blacklisted_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#blacklisted_name [`blocks_in_if_conditions`]: https://rust-lang.github.io/rust-clippy/master/index.html#blocks_in_if_conditions [`bool_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison @@ -1494,7 +1495,6 @@ Released 2018-09-13 [`not_unsafe_ptr_arg_deref`]: https://rust-lang.github.io/rust-clippy/master/index.html#not_unsafe_ptr_arg_deref [`ok_expect`]: https://rust-lang.github.io/rust-clippy/master/index.html#ok_expect [`op_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#op_ref -[`option_and_then_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_and_then_some [`option_as_ref_deref`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_as_ref_deref [`option_env_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_env_unwrap [`option_map_or_none`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_or_none diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index bda0d5c04..ec198b684 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -650,6 +650,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &mem_replace::MEM_REPLACE_OPTION_WITH_NONE, &mem_replace::MEM_REPLACE_WITH_DEFAULT, &mem_replace::MEM_REPLACE_WITH_UNINIT, + &methods::BIND_INSTEAD_OF_MAP, &methods::CHARS_LAST_CMP, &methods::CHARS_NEXT_CMP, &methods::CLONE_DOUBLE_REF, @@ -676,7 +677,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &methods::MAP_UNWRAP_OR, &methods::NEW_RET_NO_SELF, &methods::OK_EXPECT, - &methods::OPTION_AND_THEN_SOME, &methods::OPTION_AS_REF_DEREF, &methods::OPTION_MAP_OR_NONE, &methods::OR_FUN_CALL, @@ -1291,6 +1291,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&mem_replace::MEM_REPLACE_OPTION_WITH_NONE), LintId::of(&mem_replace::MEM_REPLACE_WITH_DEFAULT), LintId::of(&mem_replace::MEM_REPLACE_WITH_UNINIT), + LintId::of(&methods::BIND_INSTEAD_OF_MAP), LintId::of(&methods::CHARS_LAST_CMP), LintId::of(&methods::CHARS_NEXT_CMP), LintId::of(&methods::CLONE_DOUBLE_REF), @@ -1307,7 +1308,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&methods::MANUAL_SATURATING_ARITHMETIC), LintId::of(&methods::NEW_RET_NO_SELF), LintId::of(&methods::OK_EXPECT), - LintId::of(&methods::OPTION_AND_THEN_SOME), LintId::of(&methods::OPTION_AS_REF_DEREF), LintId::of(&methods::OPTION_MAP_OR_NONE), LintId::of(&methods::OR_FUN_CALL), @@ -1559,10 +1559,10 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&matches::MATCH_AS_REF), LintId::of(&matches::MATCH_SINGLE_BINDING), LintId::of(&matches::WILDCARD_IN_OR_PATTERNS), + LintId::of(&methods::BIND_INSTEAD_OF_MAP), LintId::of(&methods::CLONE_ON_COPY), LintId::of(&methods::FILTER_NEXT), LintId::of(&methods::FLAT_MAP_IDENTITY), - LintId::of(&methods::OPTION_AND_THEN_SOME), LintId::of(&methods::OPTION_AS_REF_DEREF), LintId::of(&methods::SEARCH_IS_SOME), LintId::of(&methods::SKIP_WHILE_NEXT), @@ -1784,6 +1784,7 @@ pub fn register_renamed(ls: &mut rustc_lint::LintStore) { ls.register_renamed("clippy::new_without_default_derive", "clippy::new_without_default"); ls.register_renamed("clippy::cyclomatic_complexity", "clippy::cognitive_complexity"); ls.register_renamed("clippy::const_static_lifetime", "clippy::redundant_static_lifetimes"); + ls.register_renamed("clippy::option_and_then_some", "clippy::bind_instead_of_map"); ls.register_renamed("clippy::block_in_if_condition_expr", "clippy::blocks_in_if_conditions"); ls.register_renamed("clippy::block_in_if_condition_stmt", "clippy::blocks_in_if_conditions"); ls.register_renamed("clippy::option_map_unwrap_or", "clippy::map_unwrap_or"); diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 4a9c411d7..84e8a0107 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -1462,7 +1462,7 @@ fn check_for_loop_over_map_kv<'a, 'tcx>( let map = sugg::Sugg::hir(cx, arg, "map"); multispan_sugg( diag, - "use the corresponding method".into(), + "use the corresponding method", vec![ (pat_span, snippet(cx, new_pat_span, kind).into_owned()), (arg_span, format!("{}.{}s{}()", map.maybe_par(), kind, mutbl)), diff --git a/clippy_lints/src/methods/bind_instead_of_map.rs b/clippy_lints/src/methods/bind_instead_of_map.rs new file mode 100644 index 000000000..32e866375 --- /dev/null +++ b/clippy_lints/src/methods/bind_instead_of_map.rs @@ -0,0 +1,309 @@ +use super::{contains_return, BIND_INSTEAD_OF_MAP}; +use crate::utils::{ + in_macro, match_qpath, match_type, method_calls, multispan_sugg_with_applicability, paths, remove_blocks, snippet, + snippet_with_macro_callsite, span_lint_and_sugg, span_lint_and_then, +}; +use if_chain::if_chain; +use rustc_errors::Applicability; +use rustc_hir as hir; +use rustc_hir::intravisit::{self, Visitor}; +use rustc_lint::LateContext; +use rustc_middle::hir::map::Map; +use rustc_span::Span; + +pub(crate) struct OptionAndThenSome; +impl BindInsteadOfMap for OptionAndThenSome { + const TYPE_NAME: &'static str = "Option"; + const TYPE_QPATH: &'static [&'static str] = &paths::OPTION; + + const BAD_METHOD_NAME: &'static str = "and_then"; + const BAD_VARIANT_NAME: &'static str = "Some"; + const BAD_VARIANT_QPATH: &'static [&'static str] = &paths::OPTION_SOME; + + const GOOD_METHOD_NAME: &'static str = "map"; +} + +pub(crate) struct ResultAndThenOk; +impl BindInsteadOfMap for ResultAndThenOk { + const TYPE_NAME: &'static str = "Result"; + const TYPE_QPATH: &'static [&'static str] = &paths::RESULT; + + const BAD_METHOD_NAME: &'static str = "and_then"; + const BAD_VARIANT_NAME: &'static str = "Ok"; + const BAD_VARIANT_QPATH: &'static [&'static str] = &paths::RESULT_OK; + + const GOOD_METHOD_NAME: &'static str = "map"; +} + +pub(crate) struct ResultOrElseErrInfo; +impl BindInsteadOfMap for ResultOrElseErrInfo { + const TYPE_NAME: &'static str = "Result"; + const TYPE_QPATH: &'static [&'static str] = &paths::RESULT; + + const BAD_METHOD_NAME: &'static str = "or_else"; + const BAD_VARIANT_NAME: &'static str = "Err"; + const BAD_VARIANT_QPATH: &'static [&'static str] = &paths::RESULT_ERR; + + const GOOD_METHOD_NAME: &'static str = "map_err"; +} + +pub(crate) trait BindInsteadOfMap { + const TYPE_NAME: &'static str; + const TYPE_QPATH: &'static [&'static str]; + + const BAD_METHOD_NAME: &'static str; + const BAD_VARIANT_NAME: &'static str; + const BAD_VARIANT_QPATH: &'static [&'static str]; + + const GOOD_METHOD_NAME: &'static str; + + fn no_op_msg() -> String { + format!( + "using `{}.{}({})`, which is a no-op", + Self::TYPE_NAME, + Self::BAD_METHOD_NAME, + Self::BAD_VARIANT_NAME + ) + } + + fn lint_msg() -> String { + format!( + "using `{}.{}(|x| {}(y))`, which is more succinctly expressed as `{}(|x| y)`", + Self::TYPE_NAME, + Self::BAD_METHOD_NAME, + Self::BAD_VARIANT_NAME, + Self::GOOD_METHOD_NAME + ) + } + + fn lint_closure_autofixable( + cx: &LateContext<'_, '_>, + expr: &hir::Expr<'_>, + args: &[hir::Expr<'_>], + closure_expr: &hir::Expr<'_>, + closure_args_span: Span, + ) -> bool { + if_chain! { + if let hir::ExprKind::Call(ref some_expr, ref some_args) = closure_expr.kind; + if let hir::ExprKind::Path(ref qpath) = some_expr.kind; + if match_qpath(qpath, Self::BAD_VARIANT_QPATH); + if some_args.len() == 1; + then { + let inner_expr = &some_args[0]; + + if contains_return(inner_expr) { + return false; + } + + let some_inner_snip = if inner_expr.span.from_expansion() { + snippet_with_macro_callsite(cx, inner_expr.span, "_") + } else { + snippet(cx, inner_expr.span, "_") + }; + + let closure_args_snip = snippet(cx, closure_args_span, ".."); + let option_snip = snippet(cx, args[0].span, ".."); + let note = format!("{}.{}({} {})", option_snip, Self::GOOD_METHOD_NAME, closure_args_snip, some_inner_snip); + span_lint_and_sugg( + cx, + BIND_INSTEAD_OF_MAP, + expr.span, + Self::lint_msg().as_ref(), + "try this", + note, + Applicability::MachineApplicable, + ); + true + } else { + false + } + } + } + + fn lint_closure(cx: &LateContext<'_, '_>, expr: &hir::Expr<'_>, closure_expr: &hir::Expr<'_>) { + let mut suggs = Vec::new(); + let can_sugg = find_all_ret_expressions(cx, closure_expr, |ret_expr| { + if_chain! { + if !in_macro(ret_expr.span); + if let hir::ExprKind::Call(ref func_path, ref args) = ret_expr.kind; + if let hir::ExprKind::Path(ref qpath) = func_path.kind; + if match_qpath(qpath, Self::BAD_VARIANT_QPATH); + if args.len() == 1; + if !contains_return(&args[0]); + then { + suggs.push((ret_expr.span, args[0].span.source_callsite())); + true + } else { + false + } + } + }); + + if can_sugg { + span_lint_and_then(cx, BIND_INSTEAD_OF_MAP, expr.span, Self::lint_msg().as_ref(), |diag| { + multispan_sugg_with_applicability( + diag, + "try this", + Applicability::MachineApplicable, + std::iter::once((*method_calls(expr, 1).2.get(0).unwrap(), Self::GOOD_METHOD_NAME.into())).chain( + suggs + .into_iter() + .map(|(span1, span2)| (span1, snippet(cx, span2, "_").into())), + ), + ) + }); + } + } + + /// Lint use of `_.and_then(|x| Some(y))` for `Option`s + fn lint(cx: &LateContext<'_, '_>, expr: &hir::Expr<'_>, args: &[hir::Expr<'_>]) { + if !match_type(cx, cx.tables.expr_ty(&args[0]), Self::TYPE_QPATH) { + return; + } + + match args[1].kind { + hir::ExprKind::Closure(_, _, body_id, closure_args_span, _) => { + let closure_body = cx.tcx.hir().body(body_id); + let closure_expr = remove_blocks(&closure_body.value); + + if !Self::lint_closure_autofixable(cx, expr, args, closure_expr, closure_args_span) { + Self::lint_closure(cx, expr, closure_expr); + } + }, + // `_.and_then(Some)` case, which is no-op. + hir::ExprKind::Path(ref qpath) if match_qpath(qpath, Self::BAD_VARIANT_QPATH) => { + span_lint_and_sugg( + cx, + BIND_INSTEAD_OF_MAP, + expr.span, + Self::no_op_msg().as_ref(), + "use the expression directly", + snippet(cx, args[0].span, "..").into(), + Applicability::MachineApplicable, + ); + }, + _ => {}, + } + } +} + +/// returns `true` if expr contains match expr desugared from try +fn contains_try(expr: &hir::Expr<'_>) -> bool { + struct TryFinder { + found: bool, + } + + impl<'hir> intravisit::Visitor<'hir> for TryFinder { + type Map = Map<'hir>; + + fn nested_visit_map(&mut self) -> intravisit::NestedVisitorMap { + intravisit::NestedVisitorMap::None + } + + fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) { + if self.found { + return; + } + match expr.kind { + hir::ExprKind::Match(_, _, hir::MatchSource::TryDesugar) => self.found = true, + _ => intravisit::walk_expr(self, expr), + } + } + } + + let mut visitor = TryFinder { found: false }; + visitor.visit_expr(expr); + visitor.found +} + +fn find_all_ret_expressions<'hir, F>(_cx: &LateContext<'_, '_>, expr: &'hir hir::Expr<'hir>, callback: F) -> bool +where + F: FnMut(&'hir hir::Expr<'hir>) -> bool, +{ + struct RetFinder { + in_stmt: bool, + failed: bool, + cb: F, + } + + struct WithStmtGuarg<'a, F> { + val: &'a mut RetFinder, + prev_in_stmt: bool, + } + + impl RetFinder { + fn inside_stmt(&mut self, in_stmt: bool) -> WithStmtGuarg<'_, F> { + let prev_in_stmt = std::mem::replace(&mut self.in_stmt, in_stmt); + WithStmtGuarg { + val: self, + prev_in_stmt, + } + } + } + + impl std::ops::Deref for WithStmtGuarg<'_, F> { + type Target = RetFinder; + + fn deref(&self) -> &Self::Target { + self.val + } + } + + impl std::ops::DerefMut for WithStmtGuarg<'_, F> { + fn deref_mut(&mut self) -> &mut Self::Target { + self.val + } + } + + impl Drop for WithStmtGuarg<'_, F> { + fn drop(&mut self) { + self.val.in_stmt = self.prev_in_stmt; + } + } + + impl<'hir, F: FnMut(&'hir hir::Expr<'hir>) -> bool> intravisit::Visitor<'hir> for RetFinder { + type Map = Map<'hir>; + + fn nested_visit_map(&mut self) -> intravisit::NestedVisitorMap { + intravisit::NestedVisitorMap::None + } + + fn visit_stmt(&mut self, stmt: &'hir hir::Stmt<'_>) { + intravisit::walk_stmt(&mut *self.inside_stmt(true), stmt) + } + + fn visit_expr(&mut self, expr: &'hir hir::Expr<'_>) { + if self.failed { + return; + } + if self.in_stmt { + match expr.kind { + hir::ExprKind::Ret(Some(expr)) => self.inside_stmt(false).visit_expr(expr), + _ => intravisit::walk_expr(self, expr), + } + } else { + match expr.kind { + hir::ExprKind::Match(cond, arms, _) => { + self.inside_stmt(true).visit_expr(cond); + for arm in arms { + self.visit_expr(arm.body); + } + }, + hir::ExprKind::Block(..) => intravisit::walk_expr(self, expr), + hir::ExprKind::Ret(Some(expr)) => self.visit_expr(expr), + _ => self.failed |= !(self.cb)(expr), + } + } + } + } + + !contains_try(expr) && { + let mut ret_finder = RetFinder { + in_stmt: false, + failed: false, + cb: callback, + }; + ret_finder.visit_expr(expr); + !ret_finder.failed + } +} diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index e6094edc5..626427c15 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -1,3 +1,4 @@ +mod bind_instead_of_map; mod inefficient_to_string; mod manual_saturating_arithmetic; mod option_map_unwrap_or; @@ -7,6 +8,7 @@ use std::borrow::Cow; use std::fmt; use std::iter; +use bind_instead_of_map::BindInsteadOfMap; use if_chain::if_chain; use rustc_ast::ast; use rustc_errors::Applicability; @@ -306,27 +308,34 @@ declare_clippy_lint! { } declare_clippy_lint! { - /// **What it does:** Checks for usage of `_.and_then(|x| Some(y))`. + /// **What it does:** Checks for usage of `_.and_then(|x| Some(y))`, `_.and_then(|x| Ok(y))` or + /// `_.or_else(|x| Err(y))`. /// /// **Why is this bad?** Readability, this can be written more concisely as - /// `_.map(|x| y)`. + /// `_.map(|x| y)` or `_.map_err(|x| y)`. /// /// **Known problems:** None /// /// **Example:** /// /// ```rust - /// let x = Some("foo"); - /// let _ = x.and_then(|s| Some(s.len())); + /// # fn opt() -> Option<&'static str> { Some("42") } + /// # fn res() -> Result<&'static str, &'static str> { Ok("42") } + /// let _ = opt().and_then(|s| Some(s.len())); + /// let _ = res().and_then(|s| if s.len() == 42 { Ok(10) } else { Ok(20) }); + /// let _ = res().or_else(|s| if s.len() == 42 { Err(10) } else { Err(20) }); /// ``` /// /// The correct use would be: /// /// ```rust - /// let x = Some("foo"); - /// let _ = x.map(|s| s.len()); + /// # fn opt() -> Option<&'static str> { Some("42") } + /// # fn res() -> Result<&'static str, &'static str> { Ok("42") } + /// let _ = opt().map(|s| s.len()); + /// let _ = res().map(|s| if s.len() == 42 { 10 } else { 20 }); + /// let _ = res().map_err(|s| if s.len() == 42 { 10 } else { 20 }); /// ``` - pub OPTION_AND_THEN_SOME, + pub BIND_INSTEAD_OF_MAP, complexity, "using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`" } @@ -1243,7 +1252,7 @@ declare_lint_pass!(Methods => [ MAP_UNWRAP_OR, RESULT_MAP_OR_INTO_OPTION, OPTION_MAP_OR_NONE, - OPTION_AND_THEN_SOME, + BIND_INSTEAD_OF_MAP, OR_FUN_CALL, EXPECT_FUN_CALL, CHARS_NEXT_CMP, @@ -1302,7 +1311,13 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Methods { ["unwrap_or", "map"] => option_map_unwrap_or::lint(cx, expr, arg_lists[1], arg_lists[0], method_spans[1]), ["unwrap_or_else", "map"] => lint_map_unwrap_or_else(cx, expr, arg_lists[1], arg_lists[0]), ["map_or", ..] => lint_map_or_none(cx, expr, arg_lists[0]), - ["and_then", ..] => lint_option_and_then_some(cx, expr, arg_lists[0]), + ["and_then", ..] => { + bind_instead_of_map::OptionAndThenSome::lint(cx, expr, arg_lists[0]); + bind_instead_of_map::ResultAndThenOk::lint(cx, expr, arg_lists[0]); + }, + ["or_else", ..] => { + bind_instead_of_map::ResultOrElseErrInfo::lint(cx, expr, arg_lists[0]); + }, ["next", "filter"] => lint_filter_next(cx, expr, arg_lists[1]), ["next", "skip_while"] => lint_skip_while_next(cx, expr, arg_lists[1]), ["map", "filter"] => lint_filter_map(cx, expr, arg_lists[1], arg_lists[0]), @@ -2601,73 +2616,6 @@ fn lint_map_or_none<'a, 'tcx>( ); } -/// Lint use of `_.and_then(|x| Some(y))` for `Option`s -fn lint_option_and_then_some(cx: &LateContext<'_, '_>, expr: &hir::Expr<'_>, args: &[hir::Expr<'_>]) { - const LINT_MSG: &str = "using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`"; - const NO_OP_MSG: &str = "using `Option.and_then(Some)`, which is a no-op"; - - let ty = cx.tables.expr_ty(&args[0]); - if !is_type_diagnostic_item(cx, ty, sym!(option_type)) { - return; - } - - match args[1].kind { - hir::ExprKind::Closure(_, _, body_id, closure_args_span, _) => { - let closure_body = cx.tcx.hir().body(body_id); - let closure_expr = remove_blocks(&closure_body.value); - if_chain! { - if let hir::ExprKind::Call(ref some_expr, ref some_args) = closure_expr.kind; - if let hir::ExprKind::Path(ref qpath) = some_expr.kind; - if match_qpath(qpath, &paths::OPTION_SOME); - if some_args.len() == 1; - then { - let inner_expr = &some_args[0]; - - if contains_return(inner_expr) { - return; - } - - let some_inner_snip = if inner_expr.span.from_expansion() { - snippet_with_macro_callsite(cx, inner_expr.span, "_") - } else { - snippet(cx, inner_expr.span, "_") - }; - - let closure_args_snip = snippet(cx, closure_args_span, ".."); - let option_snip = snippet(cx, args[0].span, ".."); - let note = format!("{}.map({} {})", option_snip, closure_args_snip, some_inner_snip); - span_lint_and_sugg( - cx, - OPTION_AND_THEN_SOME, - expr.span, - LINT_MSG, - "try this", - note, - Applicability::MachineApplicable, - ); - } - } - }, - // `_.and_then(Some)` case, which is no-op. - hir::ExprKind::Path(ref qpath) => { - if match_qpath(qpath, &paths::OPTION_SOME) { - let option_snip = snippet(cx, args[0].span, ".."); - let note = format!("{}", option_snip); - span_lint_and_sugg( - cx, - OPTION_AND_THEN_SOME, - expr.span, - NO_OP_MSG, - "use the expression directly", - note, - Applicability::MachineApplicable, - ); - } - }, - _ => {}, - } -} - /// lint use of `filter().next()` for `Iterators` fn lint_filter_next<'a, 'tcx>( cx: &LateContext<'a, 'tcx>, diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index f50adbc48..6ed9ff22e 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -2230,7 +2230,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ImplicitHasher { ); if !vis.suggestions.is_empty() { - multispan_sugg(diag, "...and use generic constructor".into(), vis.suggestions); + multispan_sugg(diag, "...and use generic constructor", vis.suggestions); } } diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index e5e3bf453..5b4e2906b 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -66,6 +66,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "bit_mask", }, + Lint { + name: "bind_instead_of_map", + group: "complexity", + desc: "using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`", + deprecation: None, + module: "methods", + }, Lint { name: "blacklisted_name", group: "style", @@ -1578,13 +1585,6 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "eq_op", }, - Lint { - name: "option_and_then_some", - group: "complexity", - desc: "using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`", - deprecation: None, - module: "methods", - }, Lint { name: "option_as_ref_deref", group: "complexity", diff --git a/tests/ui/option_and_then_some.fixed b/tests/ui/bind_instead_of_map.fixed similarity index 90% rename from tests/ui/option_and_then_some.fixed rename to tests/ui/bind_instead_of_map.fixed index 035bc1e54..5815550d7 100644 --- a/tests/ui/option_and_then_some.fixed +++ b/tests/ui/bind_instead_of_map.fixed @@ -1,5 +1,5 @@ // run-rustfix -#![deny(clippy::option_and_then_some)] +#![deny(clippy::bind_instead_of_map)] // need a main anyway, use it get rid of unused warnings too pub fn main() { @@ -12,7 +12,7 @@ pub fn main() { // Different type let x: Result = Ok(1); - let _ = x.and_then(Ok); + let _ = x; } pub fn foo() -> Option { diff --git a/tests/ui/option_and_then_some.rs b/tests/ui/bind_instead_of_map.rs similarity index 94% rename from tests/ui/option_and_then_some.rs rename to tests/ui/bind_instead_of_map.rs index d49da7813..623b100a4 100644 --- a/tests/ui/option_and_then_some.rs +++ b/tests/ui/bind_instead_of_map.rs @@ -1,5 +1,5 @@ // run-rustfix -#![deny(clippy::option_and_then_some)] +#![deny(clippy::bind_instead_of_map)] // need a main anyway, use it get rid of unused warnings too pub fn main() { diff --git a/tests/ui/option_and_then_some.stderr b/tests/ui/bind_instead_of_map.stderr similarity index 50% rename from tests/ui/option_and_then_some.stderr rename to tests/ui/bind_instead_of_map.stderr index 478254917..24c6b7f9e 100644 --- a/tests/ui/option_and_then_some.stderr +++ b/tests/ui/bind_instead_of_map.stderr @@ -1,20 +1,26 @@ error: using `Option.and_then(Some)`, which is a no-op - --> $DIR/option_and_then_some.rs:8:13 + --> $DIR/bind_instead_of_map.rs:8:13 | LL | let _ = x.and_then(Some); | ^^^^^^^^^^^^^^^^ help: use the expression directly: `x` | note: the lint level is defined here - --> $DIR/option_and_then_some.rs:2:9 + --> $DIR/bind_instead_of_map.rs:2:9 | -LL | #![deny(clippy::option_and_then_some)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | #![deny(clippy::bind_instead_of_map)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)` - --> $DIR/option_and_then_some.rs:9:13 + --> $DIR/bind_instead_of_map.rs:9:13 | LL | let _ = x.and_then(|o| Some(o + 1)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `x.map(|o| o + 1)` -error: aborting due to 2 previous errors +error: using `Result.and_then(Ok)`, which is a no-op + --> $DIR/bind_instead_of_map.rs:15:13 + | +LL | let _ = x.and_then(Ok); + | ^^^^^^^^^^^^^^ help: use the expression directly: `x` + +error: aborting due to 3 previous errors diff --git a/tests/ui/bind_instead_of_map_multipart.rs b/tests/ui/bind_instead_of_map_multipart.rs new file mode 100644 index 000000000..91d9d11e3 --- /dev/null +++ b/tests/ui/bind_instead_of_map_multipart.rs @@ -0,0 +1,61 @@ +#![deny(clippy::bind_instead_of_map)] +#![allow(clippy::blocks_in_if_conditions)] + +pub fn main() { + let _ = Some("42").and_then(|s| if s.len() < 42 { Some(0) } else { Some(s.len()) }); + let _ = Some("42").and_then(|s| if s.len() < 42 { None } else { Some(s.len()) }); + + let _ = Ok::<_, ()>("42").and_then(|s| if s.len() < 42 { Ok(0) } else { Ok(s.len()) }); + let _ = Ok::<_, ()>("42").and_then(|s| if s.len() < 42 { Err(()) } else { Ok(s.len()) }); + + let _ = Err::<(), _>("42").or_else(|s| if s.len() < 42 { Err(s.len() + 20) } else { Err(s.len()) }); + let _ = Err::<(), _>("42").or_else(|s| if s.len() < 42 { Ok(()) } else { Err(s.len()) }); + + hard_example(); + macro_example(); +} + +fn hard_example() { + Some("42").and_then(|s| { + if { + if s == "43" { + return Some(43); + } + s == "42" + } { + return Some(45); + } + match s.len() { + 10 => Some(2), + 20 => { + if foo() { + return { + if foo() { + return Some(20); + } + println!("foo"); + Some(3) + }; + } + Some(20) + }, + 40 => Some(30), + _ => Some(1), + } + }); +} + +fn foo() -> bool { + true +} + +macro_rules! m { + () => { + Some(10) + }; +} + +fn macro_example() { + let _ = Some("").and_then(|s| if s.len() == 20 { m!() } else { Some(20) }); + let _ = Some("").and_then(|s| if s.len() == 20 { Some(m!()) } else { Some(Some(20)) }); +} diff --git a/tests/ui/bind_instead_of_map_multipart.stderr b/tests/ui/bind_instead_of_map_multipart.stderr new file mode 100644 index 000000000..50ce2f405 --- /dev/null +++ b/tests/ui/bind_instead_of_map_multipart.stderr @@ -0,0 +1,73 @@ +error: using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)` + --> $DIR/bind_instead_of_map_multipart.rs:5:13 + | +LL | let _ = Some("42").and_then(|s| if s.len() < 42 { Some(0) } else { Some(s.len()) }); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +note: the lint level is defined here + --> $DIR/bind_instead_of_map_multipart.rs:1:9 + | +LL | #![deny(clippy::bind_instead_of_map)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ +help: try this + | +LL | let _ = Some("42").map(|s| if s.len() < 42 { 0 } else { s.len() }); + | ^^^ ^ ^^^^^^^ + +error: using `Result.and_then(|x| Ok(y))`, which is more succinctly expressed as `map(|x| y)` + --> $DIR/bind_instead_of_map_multipart.rs:8:13 + | +LL | let _ = Ok::<_, ()>("42").and_then(|s| if s.len() < 42 { Ok(0) } else { Ok(s.len()) }); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: try this + | +LL | let _ = Ok::<_, ()>("42").map(|s| if s.len() < 42 { 0 } else { s.len() }); + | ^^^ ^ ^^^^^^^ + +error: using `Result.or_else(|x| Err(y))`, which is more succinctly expressed as `map_err(|x| y)` + --> $DIR/bind_instead_of_map_multipart.rs:11:13 + | +LL | let _ = Err::<(), _>("42").or_else(|s| if s.len() < 42 { Err(s.len() + 20) } else { Err(s.len()) }); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: try this + | +LL | let _ = Err::<(), _>("42").map_err(|s| if s.len() < 42 { s.len() + 20 } else { s.len() }); + | ^^^^^^^ ^^^^^^^^^^^^ ^^^^^^^ + +error: using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)` + --> $DIR/bind_instead_of_map_multipart.rs:19:5 + | +LL | / Some("42").and_then(|s| { +LL | | if { +LL | | if s == "43" { +LL | | return Some(43); +... | +LL | | } +LL | | }); + | |______^ + | +help: try this + | +LL | Some("42").map(|s| { +LL | if { +LL | if s == "43" { +LL | return 43; +LL | } +LL | s == "42" + ... + +error: using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)` + --> $DIR/bind_instead_of_map_multipart.rs:60:13 + | +LL | let _ = Some("").and_then(|s| if s.len() == 20 { Some(m!()) } else { Some(Some(20)) }); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: try this + | +LL | let _ = Some("").map(|s| if s.len() == 20 { m!() } else { Some(20) }); + | ^^^ ^^^^ ^^^^^^^^ + +error: aborting due to 5 previous errors + diff --git a/tests/ui/blocks_in_if_conditions.fixed b/tests/ui/blocks_in_if_conditions.fixed index 9040552ce..14562c4d3 100644 --- a/tests/ui/blocks_in_if_conditions.fixed +++ b/tests/ui/blocks_in_if_conditions.fixed @@ -63,10 +63,10 @@ fn block_in_assert() { let opt = Some(42); assert!(opt .as_ref() - .and_then(|val| { + .map(|val| { let mut v = val * 2; v -= 1; - Some(v * 3) + v * 3 }) .is_some()); } diff --git a/tests/ui/blocks_in_if_conditions.rs b/tests/ui/blocks_in_if_conditions.rs index 2fe409b22..bda87650f 100644 --- a/tests/ui/blocks_in_if_conditions.rs +++ b/tests/ui/blocks_in_if_conditions.rs @@ -63,10 +63,10 @@ fn block_in_assert() { let opt = Some(42); assert!(opt .as_ref() - .and_then(|val| { + .map(|val| { let mut v = val * 2; v -= 1; - Some(v * 3) + v * 3 }) .is_some()); } diff --git a/tests/ui/option_map_or_none.fixed b/tests/ui/option_map_or_none.fixed index decbae4e5..d80c3c7c1 100644 --- a/tests/ui/option_map_or_none.fixed +++ b/tests/ui/option_map_or_none.fixed @@ -1,6 +1,6 @@ // run-rustfix -#![allow(clippy::option_and_then_some)] +#![allow(clippy::bind_instead_of_map)] fn main() { let opt = Some(1); diff --git a/tests/ui/option_map_or_none.rs b/tests/ui/option_map_or_none.rs index 0f1d2218d..629842419 100644 --- a/tests/ui/option_map_or_none.rs +++ b/tests/ui/option_map_or_none.rs @@ -1,6 +1,6 @@ // run-rustfix -#![allow(clippy::option_and_then_some)] +#![allow(clippy::bind_instead_of_map)] fn main() { let opt = Some(1); From 1b3dc5f79b98ba92c0b6fa98e62c8f331faa8ed6 Mon Sep 17 00:00:00 2001 From: Rahul Butani Date: Sun, 17 May 2020 22:21:02 -0500 Subject: [PATCH 0080/4780] Add to the list of words clippy::doc_markdown ignores --- clippy_lints/src/utils/conf.rs | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/clippy_lints/src/utils/conf.rs b/clippy_lints/src/utils/conf.rs index 57b9eafd1..9e8e0ff30 100644 --- a/clippy_lints/src/utils/conf.rs +++ b/clippy_lints/src/utils/conf.rs @@ -120,10 +120,12 @@ define_Conf! { "GPLv2", "GPLv3", "GitHub", "GitLab", "IPv4", "IPv6", - "JavaScript", + "ClojureScript", "CoffeeScript", "JavaScript", "PureScript", "TypeScript", "NaN", "NaNs", "OAuth", - "OpenGL", "OpenSSH", "OpenSSL", "OpenStreetMap", + "OCaml", + "OpenGL", "OpenMP", "OpenSSH", "OpenSSL", "OpenStreetMap", + "TensorFlow", "TrueType", "iOS", "macOS", "TeX", "LaTeX", "BibTeX", "BibLaTeX", From 842dd072612a5a53bef37f242f8f2be8896902cc Mon Sep 17 00:00:00 2001 From: flip1995 Date: Tue, 19 May 2020 15:18:16 +0200 Subject: [PATCH 0081/4780] Add note that a subtree fix and stack limit increase is required --- CONTRIBUTING.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 6697ff2f4..c6a3998ec 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -209,6 +209,13 @@ You can then sync with the remote names from above, e.g.: $ git subtree push -P src/tools/clippy clippy-local sync-from-rust ``` +_Note:_ The first time running `git subtree push` a cache has to be built. This +involves going through the complete Clippy history once. For this you have to +increase the stack limit though, which you can do with `ulimit -s 60000`. For +this to work, you will need the fix of `git subtree` available +[here][gitgitgadget-pr]. + +[gitgitgadget-pr]: https://github.com/gitgitgadget/git/pull/493 [subtree]: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#external-dependencies-subtree [`rust-lang/rust`]: https://github.com/rust-lang/rust From 1a9ba3b2c208f8131587ece3ad8fb159336dd694 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Tue, 19 May 2020 16:36:14 +0200 Subject: [PATCH 0082/4780] Add note, that a merge commit after push is necessary --- CONTRIBUTING.md | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index c6a3998ec..c9180e58f 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -178,6 +178,15 @@ to be run inside the `rust` directory): _Note:_ This will directly push to the remote repository. You can also push to your local copy by replacing the remote address with `/path/to/rust-clippy` directory. + + _Note:_ Most of the time you have to create a merge commit in the + `rust-clippy` repo (this has to be done in the Clippy repo, not in the + rust-copy of Clippy): + ```bash + git checkout sync-from-rust + git fetch upstream + git merge upstream/master + ``` 3. Open a PR to `rust-lang/rust-clippy` and wait for it to get merged (to accelerate the process ping the `@rust-lang/clippy` team in your PR and/or ~~annoy~~ ask them in the [Discord] channel.) From da9b138ec7645d483112c6b20e91ab595326c41d Mon Sep 17 00:00:00 2001 From: flip1995 Date: Tue, 19 May 2020 16:12:03 +0200 Subject: [PATCH 0083/4780] Update test after const_ptr functions are must_use now --- tests/ui/ptr_offset_with_cast.fixed | 12 ++++++------ tests/ui/ptr_offset_with_cast.rs | 12 ++++++------ tests/ui/ptr_offset_with_cast.stderr | 12 ++++++------ 3 files changed, 18 insertions(+), 18 deletions(-) diff --git a/tests/ui/ptr_offset_with_cast.fixed b/tests/ui/ptr_offset_with_cast.fixed index ebdd6c400..718e391e8 100644 --- a/tests/ui/ptr_offset_with_cast.fixed +++ b/tests/ui/ptr_offset_with_cast.fixed @@ -9,12 +9,12 @@ fn main() { let offset_isize = 1_isize; unsafe { - ptr.add(offset_usize); - ptr.offset(offset_isize as isize); - ptr.offset(offset_u8 as isize); + let _ = ptr.add(offset_usize); + let _ = ptr.offset(offset_isize as isize); + let _ = ptr.offset(offset_u8 as isize); - ptr.wrapping_add(offset_usize); - ptr.wrapping_offset(offset_isize as isize); - ptr.wrapping_offset(offset_u8 as isize); + let _ = ptr.wrapping_add(offset_usize); + let _ = ptr.wrapping_offset(offset_isize as isize); + let _ = ptr.wrapping_offset(offset_u8 as isize); } } diff --git a/tests/ui/ptr_offset_with_cast.rs b/tests/ui/ptr_offset_with_cast.rs index 3416c4b72..f613742c7 100644 --- a/tests/ui/ptr_offset_with_cast.rs +++ b/tests/ui/ptr_offset_with_cast.rs @@ -9,12 +9,12 @@ fn main() { let offset_isize = 1_isize; unsafe { - ptr.offset(offset_usize as isize); - ptr.offset(offset_isize as isize); - ptr.offset(offset_u8 as isize); + let _ = ptr.offset(offset_usize as isize); + let _ = ptr.offset(offset_isize as isize); + let _ = ptr.offset(offset_u8 as isize); - ptr.wrapping_offset(offset_usize as isize); - ptr.wrapping_offset(offset_isize as isize); - ptr.wrapping_offset(offset_u8 as isize); + let _ = ptr.wrapping_offset(offset_usize as isize); + let _ = ptr.wrapping_offset(offset_isize as isize); + let _ = ptr.wrapping_offset(offset_u8 as isize); } } diff --git a/tests/ui/ptr_offset_with_cast.stderr b/tests/ui/ptr_offset_with_cast.stderr index b5c7a03e2..fd45224ca 100644 --- a/tests/ui/ptr_offset_with_cast.stderr +++ b/tests/ui/ptr_offset_with_cast.stderr @@ -1,16 +1,16 @@ error: use of `offset` with a `usize` casted to an `isize` - --> $DIR/ptr_offset_with_cast.rs:12:9 + --> $DIR/ptr_offset_with_cast.rs:12:17 | -LL | ptr.offset(offset_usize as isize); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ptr.add(offset_usize)` +LL | let _ = ptr.offset(offset_usize as isize); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ptr.add(offset_usize)` | = note: `-D clippy::ptr-offset-with-cast` implied by `-D warnings` error: use of `wrapping_offset` with a `usize` casted to an `isize` - --> $DIR/ptr_offset_with_cast.rs:16:9 + --> $DIR/ptr_offset_with_cast.rs:16:17 | -LL | ptr.wrapping_offset(offset_usize as isize); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ptr.wrapping_add(offset_usize)` +LL | let _ = ptr.wrapping_offset(offset_usize as isize); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ptr.wrapping_add(offset_usize)` error: aborting due to 2 previous errors From f28f1f15da825bcf5cf78413f464dfea0bc553e5 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Wed, 20 May 2020 13:32:53 +0200 Subject: [PATCH 0084/4780] Fix dogfood fallout --- clippy_lints/src/utils/inspector.rs | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/clippy_lints/src/utils/inspector.rs b/clippy_lints/src/utils/inspector.rs index 748c11fac..9b672b9ec 100644 --- a/clippy_lints/src/utils/inspector.rs +++ b/clippy_lints/src/utils/inspector.rs @@ -289,21 +289,21 @@ fn print_expr(cx: &LateContext<'_, '_>, expr: &hir::Expr<'_>, indent: usize) { println!("{}operands:", ind); for op in asm.operands { match op { - hir::InlineAsmOperand::In { expr, .. } => print_expr(cx, expr, indent + 1), + hir::InlineAsmOperand::In { expr, .. } + | hir::InlineAsmOperand::InOut { expr, .. } + | hir::InlineAsmOperand::Const { expr } + | hir::InlineAsmOperand::Sym { expr } => print_expr(cx, expr, indent + 1), hir::InlineAsmOperand::Out { expr, .. } => { if let Some(expr) = expr { print_expr(cx, expr, indent + 1); } }, - hir::InlineAsmOperand::InOut { expr, .. } => print_expr(cx, expr, indent + 1), hir::InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => { print_expr(cx, in_expr, indent + 1); if let Some(out_expr) = out_expr { print_expr(cx, out_expr, indent + 1); } }, - hir::InlineAsmOperand::Const { expr } => print_expr(cx, expr, indent + 1), - hir::InlineAsmOperand::Sym { expr } => print_expr(cx, expr, indent + 1), } } }, From ecd0a67b01e13d7a80d2f64bbfa5da1e568367e5 Mon Sep 17 00:00:00 2001 From: Elichai Turkel Date: Wed, 20 May 2020 13:23:51 +0300 Subject: [PATCH 0085/4780] Make match_wild_err_arm pedantic, and update help messages --- clippy_lints/src/lib.rs | 3 +-- clippy_lints/src/matches.rs | 6 +++--- src/lintlist/mod.rs | 2 +- tests/ui/match_wild_err_arm.stderr | 8 ++++---- 4 files changed, 9 insertions(+), 10 deletions(-) diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 4d4fff883..057d39d4c 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -1141,6 +1141,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&match_on_vec_items::MATCH_ON_VEC_ITEMS), LintId::of(&matches::MATCH_BOOL), LintId::of(&matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS), + LintId::of(&matches::MATCH_WILD_ERR_ARM), LintId::of(&matches::SINGLE_MATCH_ELSE), LintId::of(&methods::FILTER_MAP), LintId::of(&methods::FILTER_MAP_NEXT), @@ -1285,7 +1286,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&matches::MATCH_OVERLAPPING_ARM), LintId::of(&matches::MATCH_REF_PATS), LintId::of(&matches::MATCH_SINGLE_BINDING), - LintId::of(&matches::MATCH_WILD_ERR_ARM), LintId::of(&matches::SINGLE_MATCH), LintId::of(&matches::WILDCARD_IN_OR_PATTERNS), LintId::of(&mem_discriminant::MEM_DISCRIMINANT_NON_ENUM), @@ -1476,7 +1476,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&matches::INFALLIBLE_DESTRUCTURING_MATCH), LintId::of(&matches::MATCH_OVERLAPPING_ARM), LintId::of(&matches::MATCH_REF_PATS), - LintId::of(&matches::MATCH_WILD_ERR_ARM), LintId::of(&matches::SINGLE_MATCH), LintId::of(&mem_replace::MEM_REPLACE_OPTION_WITH_NONE), LintId::of(&mem_replace::MEM_REPLACE_WITH_DEFAULT), diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs index 4106e5013..94380acfc 100644 --- a/clippy_lints/src/matches.rs +++ b/clippy_lints/src/matches.rs @@ -168,7 +168,7 @@ declare_clippy_lint! { /// **What it does:** Checks for arm which matches all errors with `Err(_)` /// and take drastic actions like `panic!`. /// - /// **Why is this bad?** It is generally a bad practice, just like + /// **Why is this bad?** It is generally a bad practice, similar to /// catching all exceptions in java with `catch(Exception)` /// /// **Known problems:** None. @@ -182,7 +182,7 @@ declare_clippy_lint! { /// } /// ``` pub MATCH_WILD_ERR_ARM, - style, + pedantic, "a `match` with `Err(_)` arm and take drastic actions" } @@ -711,7 +711,7 @@ fn check_wild_err_arm(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_>]) arm.pat.span, &format!("`Err({})` matches all errors", &ident_bind_name), None, - "match each error separately or use the error output", + "match each error separately or use the error output, or use `.except(msg)` if the error case is unreachable", ); } } diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 0bf46491d..8211a57b5 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1195,7 +1195,7 @@ pub static ref ALL_LINTS: Vec = vec![ }, Lint { name: "match_wild_err_arm", - group: "style", + group: "pedantic", desc: "a `match` with `Err(_)` arm and take drastic actions", deprecation: None, module: "matches", diff --git a/tests/ui/match_wild_err_arm.stderr b/tests/ui/match_wild_err_arm.stderr index 20d4c9334..6a2a02987 100644 --- a/tests/ui/match_wild_err_arm.stderr +++ b/tests/ui/match_wild_err_arm.stderr @@ -5,7 +5,7 @@ LL | Err(_) => panic!("err"), | ^^^^^^ | = note: `-D clippy::match-wild-err-arm` implied by `-D warnings` - = note: match each error separately or use the error output + = note: match each error separately or use the error output, or use `.except(msg)` if the error case is unreachable error: `Err(_)` matches all errors --> $DIR/match_wild_err_arm.rs:17:9 @@ -13,7 +13,7 @@ error: `Err(_)` matches all errors LL | Err(_) => panic!(), | ^^^^^^ | - = note: match each error separately or use the error output + = note: match each error separately or use the error output, or use `.except(msg)` if the error case is unreachable error: `Err(_)` matches all errors --> $DIR/match_wild_err_arm.rs:23:9 @@ -21,7 +21,7 @@ error: `Err(_)` matches all errors LL | Err(_) => { | ^^^^^^ | - = note: match each error separately or use the error output + = note: match each error separately or use the error output, or use `.except(msg)` if the error case is unreachable error: `Err(_e)` matches all errors --> $DIR/match_wild_err_arm.rs:31:9 @@ -29,7 +29,7 @@ error: `Err(_e)` matches all errors LL | Err(_e) => panic!(), | ^^^^^^^ | - = note: match each error separately or use the error output + = note: match each error separately or use the error output, or use `.except(msg)` if the error case is unreachable error: aborting due to 4 previous errors From 2db7f1abf84699605a5863887484cbf587db3eb1 Mon Sep 17 00:00:00 2001 From: Elichai Turkel Date: Wed, 20 May 2020 16:46:30 +0300 Subject: [PATCH 0086/4780] Update future-not-send stderr output --- tests/ui/future_not_send.stderr | 26 +++++++++++++++++++++++--- 1 file changed, 23 insertions(+), 3 deletions(-) diff --git a/tests/ui/future_not_send.stderr b/tests/ui/future_not_send.stderr index d1863701b..b59dbb3e7 100644 --- a/tests/ui/future_not_send.stderr +++ b/tests/ui/future_not_send.stderr @@ -47,17 +47,32 @@ error: future cannot be sent between threads safely --> $DIR/future_not_send.rs:20:63 | LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell) -> bool { - | ^^^^ + | ^^^^ future returned by `private_future2` is not `Send` | +note: captured value is not `Send` + --> $DIR/future_not_send.rs:20:26 + | +LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell) -> bool { + | ^^ has type `std::rc::Rc<[u8]>` which is not `Send` = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send` +note: captured value is not `Send` + --> $DIR/future_not_send.rs:20:40 + | +LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell) -> bool { + | ^^^^ has type `&std::cell::Cell` which is not `Send` = note: `std::cell::Cell` doesn't implement `std::marker::Sync` error: future cannot be sent between threads safely --> $DIR/future_not_send.rs:24:43 | LL | pub async fn public_future2(rc: Rc<[u8]>) {} - | ^ + | ^ future returned by `public_future2` is not `Send` | +note: captured value is not `Send` + --> $DIR/future_not_send.rs:24:29 + | +LL | pub async fn public_future2(rc: Rc<[u8]>) {} + | ^^ has type `std::rc::Rc<[u8]>` which is not `Send` = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send` error: future cannot be sent between threads safely @@ -117,8 +132,13 @@ error: future cannot be sent between threads safely --> $DIR/future_not_send.rs:66:34 | LL | async fn unclear_future(t: T) {} - | ^ + | ^ future returned by `unclear_future` is not `Send` | +note: captured value is not `Send` + --> $DIR/future_not_send.rs:66:28 + | +LL | async fn unclear_future(t: T) {} + | ^ has type `T` which is not `Send` = note: `T` doesn't implement `std::marker::Send` error: aborting due to 8 previous errors From bd9b09e29396697874f63d82926b36fa154caa1f Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 18 May 2020 20:54:09 +0200 Subject: [PATCH 0087/4780] Adapt compile-test to run tests for cargo lints --- tests/compile-test.rs | 150 ++++++++++++++++++------ tests/ui-cargo/update-all-references.sh | 18 +++ tests/ui-cargo/update-references.sh | 38 ++++++ 3 files changed, 169 insertions(+), 37 deletions(-) create mode 100755 tests/ui-cargo/update-all-references.sh create mode 100755 tests/ui-cargo/update-references.sh diff --git a/tests/compile-test.rs b/tests/compile-test.rs index a3df9d5cc..91b9c73c9 100644 --- a/tests/compile-test.rs +++ b/tests/compile-test.rs @@ -101,49 +101,124 @@ fn run_mode(cfg: &mut compiletest::Config) { compiletest::run_tests(&cfg); } -#[allow(clippy::identity_conversion)] -fn run_ui_toml_tests(config: &compiletest::Config, mut tests: Vec) -> Result { - let mut result = true; - let opts = compiletest::test_opts(config); - for dir in fs::read_dir(&config.src_base)? { - let dir = dir?; - if !dir.file_type()?.is_dir() { - continue; - } - let dir_path = dir.path(); - set_var("CARGO_MANIFEST_DIR", &dir_path); - for file in fs::read_dir(&dir_path)? { - let file = file?; - let file_path = file.path(); - if file.file_type()?.is_dir() { - continue; - } - if file_path.extension() != Some(OsStr::new("rs")) { - continue; - } - let paths = compiletest::common::TestPaths { - file: file_path, - base: config.src_base.clone(), - relative_dir: dir_path.file_name().unwrap().into(), - }; - let test_name = compiletest::make_test_name(&config, &paths); - let index = tests - .iter() - .position(|test| test.desc.name == test_name) - .expect("The test should be in there"); - result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?; - } - } - Ok(result) -} - fn run_ui_toml(config: &mut compiletest::Config) { + fn run_tests(config: &compiletest::Config, mut tests: Vec) -> Result { + let mut result = true; + let opts = compiletest::test_opts(config); + for dir in fs::read_dir(&config.src_base)? { + let dir = dir?; + if !dir.file_type()?.is_dir() { + continue; + } + let dir_path = dir.path(); + set_var("CARGO_MANIFEST_DIR", &dir_path); + for file in fs::read_dir(&dir_path)? { + let file = file?; + let file_path = file.path(); + if file.file_type()?.is_dir() { + continue; + } + if file_path.extension() != Some(OsStr::new("rs")) { + continue; + } + let paths = compiletest::common::TestPaths { + file: file_path, + base: config.src_base.clone(), + relative_dir: dir_path.file_name().unwrap().into(), + }; + let test_name = compiletest::make_test_name(&config, &paths); + let index = tests + .iter() + .position(|test| test.desc.name == test_name) + .expect("The test should be in there"); + result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?; + } + } + Ok(result) + } + config.mode = TestMode::Ui; config.src_base = Path::new("tests").join("ui-toml").canonicalize().unwrap(); let tests = compiletest::make_tests(&config); - let res = run_ui_toml_tests(&config, tests); + let res = run_tests(&config, tests); + match res { + Ok(true) => {}, + Ok(false) => panic!("Some tests failed"), + Err(e) => { + println!("I/O failure during tests: {:?}", e); + }, + } +} + +fn run_ui_cargo(config: &mut compiletest::Config) { + fn run_tests( + config: &compiletest::Config, + filter: &Option, + mut tests: Vec, + ) -> Result { + let mut result = true; + let opts = compiletest::test_opts(config); + + for dir in fs::read_dir(&config.src_base)? { + let dir = dir?; + if !dir.file_type()?.is_dir() { + continue; + } + + // Use the filter if provided + let dir_path = dir.path(); + match &filter { + Some(name) if !dir_path.ends_with(name) => continue, + _ => {}, + } + + for case in &["pass", "fail"] { + let tail: PathBuf = [case, "src"].iter().collect(); + let src_path = dir_path.join(tail); + env::set_current_dir(&src_path)?; + + for file in fs::read_dir(&src_path)? { + let file = file?; + if file.file_type()?.is_dir() { + continue; + } + + // Search for the main file to avoid running a test for each file in the project + let file_path = file.path(); + match file_path.file_name().and_then(OsStr::to_str) { + Some("main.rs") => {}, + _ => continue, + } + + let paths = compiletest::common::TestPaths { + file: file_path, + base: config.src_base.clone(), + relative_dir: src_path.strip_prefix(&config.src_base).unwrap().into(), + }; + let test_name = compiletest::make_test_name(&config, &paths); + let index = tests + .iter() + .position(|test| test.desc.name == test_name) + .expect("The test should be in there"); + result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?; + } + } + } + Ok(result) + } + + config.mode = TestMode::Ui; + config.src_base = Path::new("tests").join("ui-cargo").canonicalize().unwrap(); + + let tests = compiletest::make_tests(&config); + + let current_dir = env::current_dir().unwrap(); + let filter = env::var("TESTNAME").ok(); + let res = run_tests(&config, &filter, tests); + env::set_current_dir(current_dir).unwrap(); + match res { Ok(true) => {}, Ok(false) => panic!("Some tests failed"), @@ -165,4 +240,5 @@ fn compile_test() { let mut config = default_config(); run_mode(&mut config); run_ui_toml(&mut config); + run_ui_cargo(&mut config); } diff --git a/tests/ui-cargo/update-all-references.sh b/tests/ui-cargo/update-all-references.sh new file mode 100755 index 000000000..7028b251e --- /dev/null +++ b/tests/ui-cargo/update-all-references.sh @@ -0,0 +1,18 @@ +#!/bin/bash +# +# A script to update the references for all tests. The idea is that +# you do a run, which will generate files in the build directory +# containing the (normalized) actual output of the compiler. You then +# run this script, which will copy those files over. If you find +# yourself manually editing a foo.stderr file, you're doing it wrong. +# +# See all `update-references.sh`, if you just want to update a single test. + +if [[ "$1" == "--help" || "$1" == "-h" ]]; then + echo "usage: $0" +fi + +BUILD_DIR=$PWD/target/debug/test_build_base +MY_DIR=$(dirname "$0") +cd "$MY_DIR" || exit +find . -name '*.rs' -exec ./update-references.sh "$BUILD_DIR" {} + diff --git a/tests/ui-cargo/update-references.sh b/tests/ui-cargo/update-references.sh new file mode 100755 index 000000000..50d426787 --- /dev/null +++ b/tests/ui-cargo/update-references.sh @@ -0,0 +1,38 @@ +#!/bin/bash + +# A script to update the references for particular tests. The idea is +# that you do a run, which will generate files in the build directory +# containing the (normalized) actual output of the compiler. This +# script will then copy that output and replace the "expected output" +# files. You can then commit the changes. +# +# If you find yourself manually editing a foo.stderr file, you're +# doing it wrong. + +if [[ "$1" == "--help" || "$1" == "-h" || "$1" == "" || "$2" == "" ]]; then + echo "usage: $0 " + echo "" + echo "For example:" + echo " $0 ../../../build/x86_64-apple-darwin/test/ui *.rs */*.rs" +fi + +MYDIR=$(dirname "$0") + +BUILD_DIR="$1" +shift + +while [[ "$1" != "" ]]; do + STDERR_NAME="${1/%.rs/.stderr}" + STDOUT_NAME="${1/%.rs/.stdout}" + shift + if [[ -f "$BUILD_DIR"/"$STDOUT_NAME" ]] && \ + ! (cmp -s -- "$BUILD_DIR"/"$STDOUT_NAME" "$MYDIR"/"$STDOUT_NAME"); then + echo updating "$MYDIR"/"$STDOUT_NAME" + cp "$BUILD_DIR"/"$STDOUT_NAME" "$MYDIR"/"$STDOUT_NAME" + fi + if [[ -f "$BUILD_DIR"/"$STDERR_NAME" ]] && \ + ! (cmp -s -- "$BUILD_DIR"/"$STDERR_NAME" "$MYDIR"/"$STDERR_NAME"); then + echo updating "$MYDIR"/"$STDERR_NAME" + cp "$BUILD_DIR"/"$STDERR_NAME" "$MYDIR"/"$STDERR_NAME" + fi +done From 96af3e83601a6cd37544e70a7a816c36cc9871f5 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 18 May 2020 20:55:12 +0200 Subject: [PATCH 0088/4780] Add test for wildcard_dependencies --- tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml | 6 ++++++ tests/ui-cargo/wildcard_dependencies/fail/src/main.rs | 3 +++ tests/ui-cargo/wildcard_dependencies/fail/src/main.stderr | 6 ++++++ tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml | 6 ++++++ tests/ui-cargo/wildcard_dependencies/pass/src/main.rs | 3 +++ 5 files changed, 24 insertions(+) create mode 100644 tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml create mode 100644 tests/ui-cargo/wildcard_dependencies/fail/src/main.rs create mode 100644 tests/ui-cargo/wildcard_dependencies/fail/src/main.stderr create mode 100644 tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml create mode 100644 tests/ui-cargo/wildcard_dependencies/pass/src/main.rs diff --git a/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml b/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml new file mode 100644 index 000000000..9558dd680 --- /dev/null +++ b/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "wildcard_dependencies" +version = "0.1.0" + +[dependencies] +regex = "*" diff --git a/tests/ui-cargo/wildcard_dependencies/fail/src/main.rs b/tests/ui-cargo/wildcard_dependencies/fail/src/main.rs new file mode 100644 index 000000000..3491ccb0d --- /dev/null +++ b/tests/ui-cargo/wildcard_dependencies/fail/src/main.rs @@ -0,0 +1,3 @@ +#![warn(clippy::wildcard_dependencies)] + +fn main() {} diff --git a/tests/ui-cargo/wildcard_dependencies/fail/src/main.stderr b/tests/ui-cargo/wildcard_dependencies/fail/src/main.stderr new file mode 100644 index 000000000..9e65d2f99 --- /dev/null +++ b/tests/ui-cargo/wildcard_dependencies/fail/src/main.stderr @@ -0,0 +1,6 @@ +error: wildcard dependency for `regex` + | + = note: `-D clippy::wildcard-dependencies` implied by `-D warnings` + +error: aborting due to previous error + diff --git a/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml b/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml new file mode 100644 index 000000000..062e44162 --- /dev/null +++ b/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "wildcard_dependencies" +version = "0.1.0" + +[dependencies] +regex = "1" diff --git a/tests/ui-cargo/wildcard_dependencies/pass/src/main.rs b/tests/ui-cargo/wildcard_dependencies/pass/src/main.rs new file mode 100644 index 000000000..3491ccb0d --- /dev/null +++ b/tests/ui-cargo/wildcard_dependencies/pass/src/main.rs @@ -0,0 +1,3 @@ +#![warn(clippy::wildcard_dependencies)] + +fn main() {} From bc93f7052e4a76d62e2aa5f11649e662cb46c7ce Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 18 May 2020 20:56:33 +0200 Subject: [PATCH 0089/4780] Add test for cargo_common_metadata Fix missing `authors` entry in the provided example --- clippy_lints/src/cargo_common_metadata.rs | 1 + .../cargo_common_metadata/fail/Cargo.toml | 3 +++ .../cargo_common_metadata/fail/src/main.rs | 3 +++ .../cargo_common_metadata/fail/src/main.stderr | 18 ++++++++++++++++++ .../cargo_common_metadata/pass/Cargo.toml | 10 ++++++++++ .../cargo_common_metadata/pass/src/main.rs | 3 +++ 6 files changed, 38 insertions(+) create mode 100644 tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml create mode 100644 tests/ui-cargo/cargo_common_metadata/fail/src/main.rs create mode 100644 tests/ui-cargo/cargo_common_metadata/fail/src/main.stderr create mode 100644 tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml create mode 100644 tests/ui-cargo/cargo_common_metadata/pass/src/main.rs diff --git a/clippy_lints/src/cargo_common_metadata.rs b/clippy_lints/src/cargo_common_metadata.rs index 782da2498..16b46423c 100644 --- a/clippy_lints/src/cargo_common_metadata.rs +++ b/clippy_lints/src/cargo_common_metadata.rs @@ -23,6 +23,7 @@ declare_clippy_lint! { /// [package] /// name = "clippy" /// version = "0.0.212" + /// authors = ["Someone "] /// description = "A bunch of helpful lints to avoid common pitfalls in Rust" /// repository = "https://github.com/rust-lang/rust-clippy" /// readme = "README.md" diff --git a/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml b/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml new file mode 100644 index 000000000..8346bf057 --- /dev/null +++ b/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml @@ -0,0 +1,3 @@ +[package] +name = "cargo_common_metadata" +version = "0.1.0" diff --git a/tests/ui-cargo/cargo_common_metadata/fail/src/main.rs b/tests/ui-cargo/cargo_common_metadata/fail/src/main.rs new file mode 100644 index 000000000..c67166fc4 --- /dev/null +++ b/tests/ui-cargo/cargo_common_metadata/fail/src/main.rs @@ -0,0 +1,3 @@ +#![warn(clippy::cargo_common_metadata)] + +fn main() {} diff --git a/tests/ui-cargo/cargo_common_metadata/fail/src/main.stderr b/tests/ui-cargo/cargo_common_metadata/fail/src/main.stderr new file mode 100644 index 000000000..c8ae6c820 --- /dev/null +++ b/tests/ui-cargo/cargo_common_metadata/fail/src/main.stderr @@ -0,0 +1,18 @@ +error: package `cargo_common_metadata` is missing `package.authors` metadata + | + = note: `-D clippy::cargo-common-metadata` implied by `-D warnings` + +error: package `cargo_common_metadata` is missing `package.description` metadata + +error: package `cargo_common_metadata` is missing `either package.license or package.license_file` metadata + +error: package `cargo_common_metadata` is missing `package.repository` metadata + +error: package `cargo_common_metadata` is missing `package.readme` metadata + +error: package `cargo_common_metadata` is missing `package.keywords` metadata + +error: package `cargo_common_metadata` is missing `package.categories` metadata + +error: aborting due to 7 previous errors + diff --git a/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml b/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml new file mode 100644 index 000000000..f99c126fa --- /dev/null +++ b/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml @@ -0,0 +1,10 @@ +[package] +name = "cargo_common_metadata" +version = "0.1.0" +authors = ["Random person from the Internet "] +description = "A test package for the cargo_common_metadata lint" +repository = "https://github.com/someone/cargo_common_metadata" +readme = "README.md" +license = "MIT OR Apache-2.0" +keywords = ["metadata", "lint", "clippy"] +categories = ["development-tools::testing"] diff --git a/tests/ui-cargo/cargo_common_metadata/pass/src/main.rs b/tests/ui-cargo/cargo_common_metadata/pass/src/main.rs new file mode 100644 index 000000000..c67166fc4 --- /dev/null +++ b/tests/ui-cargo/cargo_common_metadata/pass/src/main.rs @@ -0,0 +1,3 @@ +#![warn(clippy::cargo_common_metadata)] + +fn main() {} From 7a0eccbd8a719af00b027b0ea85c576d9cbed750 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 18 May 2020 20:58:02 +0200 Subject: [PATCH 0090/4780] Add test for multiple_crate_versions Make the output of the lint deterministic by sorting the versions --- clippy_lints/src/multiple_crate_versions.rs | 4 +++- tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml | 7 +++++++ tests/ui-cargo/multiple_crate_versions/fail/src/main.rs | 3 +++ .../ui-cargo/multiple_crate_versions/fail/src/main.stderr | 6 ++++++ tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml | 7 +++++++ tests/ui-cargo/multiple_crate_versions/pass/src/main.rs | 3 +++ 6 files changed, 29 insertions(+), 1 deletion(-) create mode 100644 tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml create mode 100644 tests/ui-cargo/multiple_crate_versions/fail/src/main.rs create mode 100644 tests/ui-cargo/multiple_crate_versions/fail/src/main.stderr create mode 100644 tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml create mode 100644 tests/ui-cargo/multiple_crate_versions/pass/src/main.rs diff --git a/clippy_lints/src/multiple_crate_versions.rs b/clippy_lints/src/multiple_crate_versions.rs index ed85d0315..c4decfc94 100644 --- a/clippy_lints/src/multiple_crate_versions.rs +++ b/clippy_lints/src/multiple_crate_versions.rs @@ -54,7 +54,9 @@ impl LateLintPass<'_, '_> for MultipleCrateVersions { let group: Vec = group.collect(); if group.len() > 1 { - let versions = group.into_iter().map(|p| p.version).join(", "); + let mut versions: Vec<_> = group.into_iter().map(|p| p.version).collect(); + versions.sort(); + let versions = versions.iter().join(", "); span_lint( cx, diff --git a/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml b/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml new file mode 100644 index 000000000..05ffde839 --- /dev/null +++ b/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml @@ -0,0 +1,7 @@ +[package] +name = "multiple_crate_versions" +version = "0.1.0" + +[dependencies] +ctrlc = "=3.1.0" +ansi_term = "=0.11.0" diff --git a/tests/ui-cargo/multiple_crate_versions/fail/src/main.rs b/tests/ui-cargo/multiple_crate_versions/fail/src/main.rs new file mode 100644 index 000000000..4bc61dd62 --- /dev/null +++ b/tests/ui-cargo/multiple_crate_versions/fail/src/main.rs @@ -0,0 +1,3 @@ +#![warn(clippy::multiple_crate_versions)] + +fn main() {} diff --git a/tests/ui-cargo/multiple_crate_versions/fail/src/main.stderr b/tests/ui-cargo/multiple_crate_versions/fail/src/main.stderr new file mode 100644 index 000000000..4f668599b --- /dev/null +++ b/tests/ui-cargo/multiple_crate_versions/fail/src/main.stderr @@ -0,0 +1,6 @@ +error: multiple versions for dependency `winapi`: 0.2.8, 0.3.8 + | + = note: `-D clippy::multiple-crate-versions` implied by `-D warnings` + +error: aborting due to previous error + diff --git a/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml b/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml new file mode 100644 index 000000000..cad32b923 --- /dev/null +++ b/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml @@ -0,0 +1,7 @@ +[package] +name = "cargo_common_metadata" +version = "0.1.0" + +[dependencies] +regex = "1.3.7" +serde = "1.0.110" diff --git a/tests/ui-cargo/multiple_crate_versions/pass/src/main.rs b/tests/ui-cargo/multiple_crate_versions/pass/src/main.rs new file mode 100644 index 000000000..4bc61dd62 --- /dev/null +++ b/tests/ui-cargo/multiple_crate_versions/pass/src/main.rs @@ -0,0 +1,3 @@ +#![warn(clippy::multiple_crate_versions)] + +fn main() {} From 1eb6adf47579e3c56b38ba6cce7676e8d2d5beb0 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 18 May 2020 21:03:37 +0200 Subject: [PATCH 0091/4780] Adapt `cargo dev new_lint` to create tests for cargo lints --- clippy_dev/src/new_lint.rs | 182 ++++++++++++++++++++++--------------- 1 file changed, 107 insertions(+), 75 deletions(-) diff --git a/clippy_dev/src/new_lint.rs b/clippy_dev/src/new_lint.rs index 44b2a5383..843beaf32 100644 --- a/clippy_dev/src/new_lint.rs +++ b/clippy_dev/src/new_lint.rs @@ -1,91 +1,110 @@ use crate::clippy_project_root; -use std::fs::{File, OpenOptions}; -use std::io; +use std::fs::{self, OpenOptions}; use std::io::prelude::*; -use std::io::ErrorKind; -use std::path::Path; +use std::io::{self, ErrorKind}; +use std::path::{Path, PathBuf}; -/// Creates files required to implement and test a new lint and runs `update_lints`. -/// -/// # Errors -/// -/// This function errors, if the files couldn't be created -pub fn create(pass: Option<&str>, lint_name: Option<&str>, category: Option<&str>) -> Result<(), io::Error> { - let pass = pass.expect("`pass` argument is validated by clap"); - let lint_name = lint_name.expect("`name` argument is validated by clap"); - let category = category.expect("`category` argument is validated by clap"); +struct LintData<'a> { + pass: &'a str, + name: &'a str, + category: &'a str, + project_root: PathBuf, +} - match open_files(lint_name) { - Ok((mut test_file, mut lint_file)) => { - let (pass_type, pass_lifetimes, pass_import, context_import) = match pass { - "early" => ("EarlyLintPass", "", "use rustc_ast::ast::*;", "EarlyContext"), - "late" => ("LateLintPass", "<'_, '_>", "use rustc_hir::*;", "LateContext"), - _ => { - unreachable!("`pass_type` should only ever be `early` or `late`!"); - }, - }; +trait Context { + fn context>(self, text: C) -> Self; +} - let camel_case_name = to_camel_case(lint_name); - - if let Err(e) = test_file.write_all(get_test_file_contents(lint_name).as_bytes()) { - return Err(io::Error::new( - ErrorKind::Other, - format!("Could not write to test file: {}", e), - )); - }; - - if let Err(e) = lint_file.write_all( - get_lint_file_contents( - pass_type, - pass_lifetimes, - lint_name, - &camel_case_name, - category, - pass_import, - context_import, - ) - .as_bytes(), - ) { - return Err(io::Error::new( - ErrorKind::Other, - format!("Could not write to lint file: {}", e), - )); - } - Ok(()) - }, - Err(e) => Err(io::Error::new( - ErrorKind::Other, - format!("Unable to create lint: {}", e), - )), +impl Context for io::Result { + fn context>(self, text: C) -> Self { + match self { + Err(e) => { + let message = format!("{}: {}", text.as_ref(), e); + Err(io::Error::new(ErrorKind::Other, message)) + }, + ok => ok, + } } } -fn open_files(lint_name: &str) -> Result<(File, File), io::Error> { - let project_root = clippy_project_root(); +/// Creates the files required to implement and test a new lint and runs `update_lints`. +/// +/// # Errors +/// +/// This function errors out if the files couldn't be created or written to. +pub fn create(pass: Option<&str>, lint_name: Option<&str>, category: Option<&str>) -> io::Result<()> { + let lint = LintData { + pass: pass.expect("`pass` argument is validated by clap"), + name: lint_name.expect("`name` argument is validated by clap"), + category: category.expect("`category` argument is validated by clap"), + project_root: clippy_project_root(), + }; - let test_file_path = project_root.join("tests").join("ui").join(format!("{}.rs", lint_name)); - let lint_file_path = project_root - .join("clippy_lints") - .join("src") - .join(format!("{}.rs", lint_name)); + create_lint(&lint).context("Unable to create lint implementation")?; + create_test(&lint).context("Unable to create a test for the new lint") +} - if Path::new(&test_file_path).exists() { - return Err(io::Error::new( - ErrorKind::AlreadyExists, - format!("test file {:?} already exists", test_file_path), - )); - } - if Path::new(&lint_file_path).exists() { - return Err(io::Error::new( - ErrorKind::AlreadyExists, - format!("lint file {:?} already exists", lint_file_path), - )); +fn create_lint(lint: &LintData) -> io::Result<()> { + let (pass_type, pass_lifetimes, pass_import, context_import) = match lint.pass { + "early" => ("EarlyLintPass", "", "use rustc_ast::ast::*;", "EarlyContext"), + "late" => ("LateLintPass", "<'_, '_>", "use rustc_hir::*;", "LateContext"), + _ => { + unreachable!("`pass_type` should only ever be `early` or `late`!"); + }, + }; + + let camel_case_name = to_camel_case(lint.name); + let lint_contents = get_lint_file_contents( + pass_type, + pass_lifetimes, + lint.name, + &camel_case_name, + lint.category, + pass_import, + context_import, + ); + + let lint_path = format!("clippy_lints/src/{}.rs", lint.name); + write_file(lint.project_root.join(&lint_path), lint_contents.as_bytes()) +} + +fn create_test(lint: &LintData) -> io::Result<()> { + fn create_project_layout>(lint_name: &str, location: P, case: &str, hint: &str) -> io::Result<()> { + let mut path = location.into().join(case); + fs::create_dir(&path)?; + write_file(path.join("Cargo.toml"), get_manifest_contents(lint_name, hint))?; + + path.push("src"); + fs::create_dir(&path)?; + write_file(path.join("main.rs"), get_test_file_contents(lint_name))?; + + Ok(()) } - let test_file = OpenOptions::new().write(true).create_new(true).open(test_file_path)?; - let lint_file = OpenOptions::new().write(true).create_new(true).open(lint_file_path)?; + if lint.category == "cargo" { + let relative_test_dir = format!("tests/ui-cargo/{}", lint.name); + let test_dir = lint.project_root.join(relative_test_dir); + fs::create_dir(&test_dir)?; - Ok((test_file, lint_file)) + create_project_layout(lint.name, &test_dir, "fail", "Content that triggers the lint goes here")?; + create_project_layout(lint.name, &test_dir, "pass", "This file should not trigger the lint") + } else { + let test_path = format!("tests/ui/{}.rs", lint.name); + let test_contents = get_test_file_contents(lint.name); + write_file(lint.project_root.join(test_path), test_contents) + } +} + +fn write_file, C: AsRef<[u8]>>(path: P, contents: C) -> io::Result<()> { + fn inner(path: &Path, contents: &[u8]) -> io::Result<()> { + OpenOptions::new() + .write(true) + .create_new(true) + .open(path)? + .write_all(contents) + } + + inner(path.as_ref(), contents.as_ref()).context(format!("writing to file: {}", path.as_ref().display())) } fn to_camel_case(name: &str) -> String { @@ -112,6 +131,19 @@ fn main() {{ ) } +fn get_manifest_contents(lint_name: &str, hint: &str) -> String { + format!( + r#" +# {} + +[package] +name = "{}" +version = "0.1.0" +"#, + hint, lint_name + ) +} + fn get_lint_file_contents( pass_type: &str, pass_lifetimes: &str, From 5d0135e222448e637ec1d66b3dd5c0805884dedd Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 18 May 2020 21:39:56 +0200 Subject: [PATCH 0092/4780] Add documentation for testing cargo lints --- doc/adding_lints.md | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/doc/adding_lints.md b/doc/adding_lints.md index 9ad1315c1..75768681d 100644 --- a/doc/adding_lints.md +++ b/doc/adding_lints.md @@ -42,8 +42,10 @@ case), and we don't need type information so it will have an early pass type `cargo dev new_lint --name=foo_functions --pass=early --category=pedantic` (category will default to nursery if not provided). This command will create two files: `tests/ui/foo_functions.rs` and `clippy_lints/src/foo_functions.rs`, -as well as run `cargo dev update_lints` to register the new lint. Next, we'll -open up these files and add our lint! +as well as run `cargo dev update_lints` to register the new lint. For cargo lints, +two project hierarchies (fail/pass) will be created under `tests/ui-cargo`. + +Next, we'll open up these files and add our lint! ## Testing @@ -105,6 +107,19 @@ our lint, we need to commit the generated `.stderr` files, too. In general, you should only commit files changed by `tests/ui/update-all-references.sh` for the specific lint you are creating/editing. +### Cargo lints + +For cargo lints, the process of testing differs in that we are interested in +the contents of the `Cargo.toml` files. If our new lint is named e.g. `foo_categories`, +after running `cargo dev new_lint` we will find two new manifest files: + +* `tests/ui-cargo/foo_categories/fail/Cargo.toml`: this file should cause the new lint to raise an error. +* `tests/ui-cargo/foo_categories/pass/Cargo.toml`: this file should not trigger the lint. + +The process of generating the `.stderr` file is the same, and prepending the `TESTNAME` +variable to `cargo uitest` works too, but the script to update the references +is in another path: `tests/ui-cargo/update-all-references.sh`. + ## Rustfix tests If the lint you are working on is making use of structured suggestions, the From 7ff71199df911b462800cf6bda7ac32879ba7eb1 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Thu, 21 May 2020 14:46:04 +0200 Subject: [PATCH 0093/4780] Address comments from PR review --- clippy_dev/src/new_lint.rs | 1 + tests/compile-test.rs | 4 ++-- tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml | 1 + tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml | 1 + tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml | 1 + tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml | 1 + tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml | 1 + tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml | 1 + 8 files changed, 9 insertions(+), 2 deletions(-) diff --git a/clippy_dev/src/new_lint.rs b/clippy_dev/src/new_lint.rs index 843beaf32..80713ab56 100644 --- a/clippy_dev/src/new_lint.rs +++ b/clippy_dev/src/new_lint.rs @@ -139,6 +139,7 @@ fn get_manifest_contents(lint_name: &str, hint: &str) -> String { [package] name = "{}" version = "0.1.0" +publish = false "#, hint, lint_name ) diff --git a/tests/compile-test.rs b/tests/compile-test.rs index 91b9c73c9..232b966f6 100644 --- a/tests/compile-test.rs +++ b/tests/compile-test.rs @@ -147,7 +147,7 @@ fn run_ui_toml(config: &mut compiletest::Config) { Ok(true) => {}, Ok(false) => panic!("Some tests failed"), Err(e) => { - println!("I/O failure during tests: {:?}", e); + panic!("I/O failure during tests: {:?}", e); }, } } @@ -223,7 +223,7 @@ fn run_ui_cargo(config: &mut compiletest::Config) { Ok(true) => {}, Ok(false) => panic!("Some tests failed"), Err(e) => { - println!("I/O failure during tests: {:?}", e); + panic!("I/O failure during tests: {:?}", e); }, } } diff --git a/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml b/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml index 8346bf057..c64adcf7c 100644 --- a/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml +++ b/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml @@ -1,3 +1,4 @@ [package] name = "cargo_common_metadata" version = "0.1.0" +publish = false diff --git a/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml b/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml index f99c126fa..c8233f328 100644 --- a/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml +++ b/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml @@ -1,6 +1,7 @@ [package] name = "cargo_common_metadata" version = "0.1.0" +publish = false authors = ["Random person from the Internet "] description = "A test package for the cargo_common_metadata lint" repository = "https://github.com/someone/cargo_common_metadata" diff --git a/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml b/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml index 05ffde839..3a94b723f 100644 --- a/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml +++ b/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml @@ -1,6 +1,7 @@ [package] name = "multiple_crate_versions" version = "0.1.0" +publish = false [dependencies] ctrlc = "=3.1.0" diff --git a/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml b/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml index cad32b923..a9b06420b 100644 --- a/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml +++ b/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml @@ -1,6 +1,7 @@ [package] name = "cargo_common_metadata" version = "0.1.0" +publish = false [dependencies] regex = "1.3.7" diff --git a/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml b/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml index 9558dd680..fd2a34148 100644 --- a/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml +++ b/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml @@ -1,6 +1,7 @@ [package] name = "wildcard_dependencies" version = "0.1.0" +publish = false [dependencies] regex = "*" diff --git a/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml b/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml index 062e44162..38cb13914 100644 --- a/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml +++ b/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml @@ -1,6 +1,7 @@ [package] name = "wildcard_dependencies" version = "0.1.0" +publish = false [dependencies] regex = "1" From 1a04686fc0d2752de8731c833ab67bfae6136720 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Thu, 21 May 2020 14:47:13 +0200 Subject: [PATCH 0094/4780] Avoid triggering match_wildcard_for_single_variants --- clippy_dev/src/new_lint.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/clippy_dev/src/new_lint.rs b/clippy_dev/src/new_lint.rs index 80713ab56..08a2e0c09 100644 --- a/clippy_dev/src/new_lint.rs +++ b/clippy_dev/src/new_lint.rs @@ -18,11 +18,11 @@ trait Context { impl Context for io::Result { fn context>(self, text: C) -> Self { match self { + Ok(t) => Ok(t), Err(e) => { let message = format!("{}: {}", text.as_ref(), e); Err(io::Error::new(ErrorKind::Other, message)) }, - ok => ok, } } } From f9013ff197a693798f0532f88bab0ae591d5ff82 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Thu, 21 May 2020 15:34:48 +0200 Subject: [PATCH 0095/4780] Relax fs layout so that multiple pass/fail manifests are possible --- doc/adding_lints.md | 11 ++++++++--- tests/compile-test.rs | 10 +++++++--- 2 files changed, 15 insertions(+), 6 deletions(-) diff --git a/doc/adding_lints.md b/doc/adding_lints.md index 75768681d..b3f5a62d5 100644 --- a/doc/adding_lints.md +++ b/doc/adding_lints.md @@ -43,7 +43,7 @@ case), and we don't need type information so it will have an early pass type (category will default to nursery if not provided). This command will create two files: `tests/ui/foo_functions.rs` and `clippy_lints/src/foo_functions.rs`, as well as run `cargo dev update_lints` to register the new lint. For cargo lints, -two project hierarchies (fail/pass) will be created under `tests/ui-cargo`. +two project hierarchies (fail/pass) will be created by default under `tests/ui-cargo`. Next, we'll open up these files and add our lint! @@ -110,12 +110,17 @@ specific lint you are creating/editing. ### Cargo lints For cargo lints, the process of testing differs in that we are interested in -the contents of the `Cargo.toml` files. If our new lint is named e.g. `foo_categories`, -after running `cargo dev new_lint` we will find two new manifest files: +the `Cargo.toml` manifest file. We also need a minimal crate associated +with that manifest. + +If our new lint is named e.g. `foo_categories`, after running `cargo dev new_lint` +we will find by default two new crates, each with its manifest file: * `tests/ui-cargo/foo_categories/fail/Cargo.toml`: this file should cause the new lint to raise an error. * `tests/ui-cargo/foo_categories/pass/Cargo.toml`: this file should not trigger the lint. +If you need more cases, you can copy one of those crates (under `foo_categories`) and rename it. + The process of generating the `.stderr` file is the same, and prepending the `TESTNAME` variable to `cargo uitest` works too, but the script to update the references is in another path: `tests/ui-cargo/update-all-references.sh`. diff --git a/tests/compile-test.rs b/tests/compile-test.rs index 232b966f6..a5de84293 100644 --- a/tests/compile-test.rs +++ b/tests/compile-test.rs @@ -174,9 +174,13 @@ fn run_ui_cargo(config: &mut compiletest::Config) { _ => {}, } - for case in &["pass", "fail"] { - let tail: PathBuf = [case, "src"].iter().collect(); - let src_path = dir_path.join(tail); + for case in fs::read_dir(&dir_path)? { + let case = case?; + if !case.file_type()?.is_dir() { + continue; + } + + let src_path = case.path().join("src"); env::set_current_dir(&src_path)?; for file in fs::read_dir(&src_path)? { From c00268d984b80e408f56b5d8180e2f1a80100c91 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Fri, 22 May 2020 02:40:39 +0200 Subject: [PATCH 0096/4780] Also install llvm-tools on toolchain setup --- setup-toolchain.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/setup-toolchain.sh b/setup-toolchain.sh index 6038ed697..191ea4315 100755 --- a/setup-toolchain.sh +++ b/setup-toolchain.sh @@ -32,5 +32,5 @@ else TOOLCHAIN=() fi -rustup-toolchain-install-master -f -n master "${TOOLCHAIN[@]}" -c rustc-dev -- "$RUST_COMMIT" +rustup-toolchain-install-master -f -n master "${TOOLCHAIN[@]}" -c rustc-dev -c llvm-tools -- "$RUST_COMMIT" rustup override set master From 6b3cf63bf568cab4f8e05ea483ad97d5ea0e2eec Mon Sep 17 00:00:00 2001 From: flip1995 Date: Fri, 22 May 2020 14:45:51 +0200 Subject: [PATCH 0097/4780] Fix dogfood fallout --- clippy_lints/src/methods/mod.rs | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index 810a226b5..32b3b7f79 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -1496,17 +1496,14 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Methods { if let ty::Opaque(def_id, _) = ret_ty.kind { // one of the associated types must be Self for predicate in cx.tcx.predicates_of(def_id).predicates { - match predicate.0.kind() { - ty::PredicateKind::Projection(poly_projection_predicate) => { - let binder = poly_projection_predicate.ty(); - let associated_type = binder.skip_binder(); + if let ty::PredicateKind::Projection(poly_projection_predicate) = predicate.0.kind() { + let binder = poly_projection_predicate.ty(); + let associated_type = binder.skip_binder(); - // walk the associated type and check for Self - if contains_self_ty(associated_type) { - return; - } - }, - _ => {}, + // walk the associated type and check for Self + if contains_self_ty(associated_type) { + return; + } } } } From a578bed69ac2a9b33fcb871f9ad7dbf02355cb82 Mon Sep 17 00:00:00 2001 From: Andy Russell Date: Mon, 18 May 2020 18:35:49 -0400 Subject: [PATCH 0098/4780] new_without_default: do not suggest deriving --- clippy_lints/src/new_without_default.rs | 118 +++++------------------- tests/ui/new_without_default.rs | 11 +++ tests/ui/new_without_default.stderr | 35 ++++++- 3 files changed, 64 insertions(+), 100 deletions(-) diff --git a/clippy_lints/src/new_without_default.rs b/clippy_lints/src/new_without_default.rs index a599667b8..3b88e4c4c 100644 --- a/clippy_lints/src/new_without_default.rs +++ b/clippy_lints/src/new_without_default.rs @@ -1,27 +1,20 @@ use crate::utils::paths; use crate::utils::sugg::DiagnosticBuilderExt; -use crate::utils::{get_trait_def_id, implements_trait, return_ty, same_tys, span_lint_hir_and_then}; +use crate::utils::{get_trait_def_id, return_ty, same_tys, span_lint_hir_and_then}; use if_chain::if_chain; use rustc_errors::Applicability; use rustc_hir as hir; -use rustc_hir::def_id::DefId; use rustc_hir::HirIdSet; use rustc_lint::{LateContext, LateLintPass, LintContext}; use rustc_middle::lint::in_external_macro; -use rustc_middle::ty::{self, Ty}; +use rustc_middle::ty::Ty; use rustc_session::{declare_tool_lint, impl_lint_pass}; -use rustc_span::source_map::Span; declare_clippy_lint! { /// **What it does:** Checks for types with a `fn new() -> Self` method and no /// implementation of /// [`Default`](https://doc.rust-lang.org/std/default/trait.Default.html). /// - /// It detects both the case when a manual - /// [`Default`](https://doc.rust-lang.org/std/default/trait.Default.html) - /// implementation is required and also when it can be created with - /// `#[derive(Default)]` - /// /// **Why is this bad?** The user might expect to be able to use /// [`Default`](https://doc.rust-lang.org/std/default/trait.Default.html) as the /// type can be constructed without arguments. @@ -40,46 +33,17 @@ declare_clippy_lint! { /// } /// ``` /// - /// Instead, use: + /// To fix the lint, and a `Default` implementation that delegates to `new`: /// /// ```ignore /// struct Foo(Bar); /// /// impl Default for Foo { /// fn default() -> Self { - /// Foo(Bar::new()) + /// Foo::new() /// } /// } /// ``` - /// - /// Or, if - /// [`Default`](https://doc.rust-lang.org/std/default/trait.Default.html) - /// can be derived by `#[derive(Default)]`: - /// - /// ```rust - /// struct Foo; - /// - /// impl Foo { - /// fn new() -> Self { - /// Foo - /// } - /// } - /// ``` - /// - /// Instead, use: - /// - /// ```rust - /// #[derive(Default)] - /// struct Foo; - /// - /// impl Foo { - /// fn new() -> Self { - /// Foo - /// } - /// } - /// ``` - /// - /// You can also have `new()` call `Default::default()`. pub NEW_WITHOUT_DEFAULT, style, "`fn new() -> Self` method without `Default` implementation" @@ -158,46 +122,25 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NewWithoutDefault { } } - if let Some(sp) = can_derive_default(self_ty, cx, default_trait_id) { - span_lint_hir_and_then( - cx, - NEW_WITHOUT_DEFAULT, - id, - impl_item.span, - &format!( - "you should consider deriving a `Default` implementation for `{}`", - self_ty - ), - |diag| { - diag.suggest_item_with_attr( - cx, - sp, - "try this", - "#[derive(Default)]", - Applicability::MaybeIncorrect, - ); - }); - } else { - span_lint_hir_and_then( - cx, - NEW_WITHOUT_DEFAULT, - id, - impl_item.span, - &format!( - "you should consider adding a `Default` implementation for `{}`", - self_ty - ), - |diag| { - diag.suggest_prepend_item( - cx, - item.span, - "try this", - &create_new_without_default_suggest_msg(self_ty), - Applicability::MaybeIncorrect, - ); - }, - ); - } + span_lint_hir_and_then( + cx, + NEW_WITHOUT_DEFAULT, + id, + impl_item.span, + &format!( + "you should consider adding a `Default` implementation for `{}`", + self_ty + ), + |diag| { + diag.suggest_prepend_item( + cx, + item.span, + "try this", + &create_new_without_default_suggest_msg(self_ty), + Applicability::MaybeIncorrect, + ); + }, + ); } } } @@ -217,18 +160,3 @@ fn create_new_without_default_suggest_msg(ty: Ty<'_>) -> String { }} }}", ty) } - -fn can_derive_default<'t, 'c>(ty: Ty<'t>, cx: &LateContext<'c, 't>, default_trait_id: DefId) -> Option { - match ty.kind { - ty::Adt(adt_def, substs) if adt_def.is_struct() => { - for field in adt_def.all_fields() { - let f_ty = field.ty(cx.tcx, substs); - if !implements_trait(cx, f_ty, default_trait_id, &[]) { - return None; - } - } - Some(cx.tcx.def_span(adt_def.did)) - }, - _ => None, - } -} diff --git a/tests/ui/new_without_default.rs b/tests/ui/new_without_default.rs index 781ea7bb1..3b6041823 100644 --- a/tests/ui/new_without_default.rs +++ b/tests/ui/new_without_default.rs @@ -148,4 +148,15 @@ impl AllowDerive { } } +pub struct NewNotEqualToDerive { + foo: i32, +} + +impl NewNotEqualToDerive { + // This `new` implementation is not equal to a derived `Default`, so do not suggest deriving. + pub fn new() -> Self { + NewNotEqualToDerive { foo: 1 } + } +} + fn main() {} diff --git a/tests/ui/new_without_default.stderr b/tests/ui/new_without_default.stderr index 5e485d406..e529e441e 100644 --- a/tests/ui/new_without_default.stderr +++ b/tests/ui/new_without_default.stderr @@ -1,4 +1,4 @@ -error: you should consider deriving a `Default` implementation for `Foo` +error: you should consider adding a `Default` implementation for `Foo` --> $DIR/new_without_default.rs:8:5 | LL | / pub fn new() -> Foo { @@ -9,10 +9,14 @@ LL | | } = note: `-D clippy::new-without-default` implied by `-D warnings` help: try this | -LL | #[derive(Default)] +LL | impl Default for Foo { +LL | fn default() -> Self { +LL | Self::new() +LL | } +LL | } | -error: you should consider deriving a `Default` implementation for `Bar` +error: you should consider adding a `Default` implementation for `Bar` --> $DIR/new_without_default.rs:16:5 | LL | / pub fn new() -> Self { @@ -22,7 +26,11 @@ LL | | } | help: try this | -LL | #[derive(Default)] +LL | impl Default for Bar { +LL | fn default() -> Self { +LL | Self::new() +LL | } +LL | } | error: you should consider adding a `Default` implementation for `LtKo<'c>` @@ -42,5 +50,22 @@ LL | } LL | } | -error: aborting due to 3 previous errors +error: you should consider adding a `Default` implementation for `NewNotEqualToDerive` + --> $DIR/new_without_default.rs:157:5 + | +LL | / pub fn new() -> Self { +LL | | NewNotEqualToDerive { foo: 1 } +LL | | } + | |_____^ + | +help: try this + | +LL | impl Default for NewNotEqualToDerive { +LL | fn default() -> Self { +LL | Self::new() +LL | } +LL | } + | + +error: aborting due to 4 previous errors From 29d043683e6f70b22ae34596b4cb9ae07274c28b Mon Sep 17 00:00:00 2001 From: Tim Nielens Date: Fri, 22 May 2020 19:09:24 +0200 Subject: [PATCH 0099/4780] option_option test case #4298 --- tests/ui/option_option.rs | 25 +++++++++++++++++++++++++ tests/ui/option_option.stderr | 8 +++++++- 2 files changed, 32 insertions(+), 1 deletion(-) diff --git a/tests/ui/option_option.rs b/tests/ui/option_option.rs index 904c50e14..a2617a13e 100644 --- a/tests/ui/option_option.rs +++ b/tests/ui/option_option.rs @@ -60,3 +60,28 @@ fn main() { // The lint allows this let expr = Some(Some(true)); } + +extern crate serde; +mod issue_4298 { + use serde::{Deserialize, Deserializer, Serialize}; + use std::borrow::Cow; + + #[derive(Serialize, Deserialize)] + struct Foo<'a> { + #[serde(deserialize_with = "func")] + #[serde(skip_serializing_if = "Option::is_none")] + #[serde(default)] + #[serde(borrow)] + // FIXME: should not lint here + #[allow(clippy::option_option)] + foo: Option>>, + } + + #[allow(clippy::option_option)] + fn func<'a, D>(_: D) -> Result>>, D::Error> + where + D: Deserializer<'a>, + { + Ok(Some(Some(Cow::Borrowed("hi")))) + } +} diff --git a/tests/ui/option_option.stderr b/tests/ui/option_option.stderr index 79db186d7..0cd4c96eb 100644 --- a/tests/ui/option_option.stderr +++ b/tests/ui/option_option.stderr @@ -58,5 +58,11 @@ error: consider using `Option` instead of `Option>` or a custom enu LL | Struct { x: Option> }, | ^^^^^^^^^^^^^^^^^^ -error: aborting due to 9 previous errors +error: consider using `Option` instead of `Option>` or a custom enum if you need to distinguish all 3 cases + --> $DIR/option_option.rs:77:14 + | +LL | foo: Option>>, + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: aborting due to 10 previous errors From a709559705db19785b29ce4a9044d7aebaefec31 Mon Sep 17 00:00:00 2001 From: Nick Torres Date: Sat, 23 May 2020 16:14:38 -0700 Subject: [PATCH 0100/4780] Clarify the documentation of the `unnecessary_mut_passed` lint --- clippy_lints/src/mut_reference.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/clippy_lints/src/mut_reference.rs b/clippy_lints/src/mut_reference.rs index e5680482e..67a1ac78a 100644 --- a/clippy_lints/src/mut_reference.rs +++ b/clippy_lints/src/mut_reference.rs @@ -6,7 +6,7 @@ use rustc_middle::ty::{self, Ty}; use rustc_session::{declare_lint_pass, declare_tool_lint}; declare_clippy_lint! { - /// **What it does:** Detects giving a mutable reference to a function that only + /// **What it does:** Detects passing a mutable reference to a function that only /// requires an immutable reference. /// /// **Why is this bad?** The immutable reference rules out all other references From 7a83eafd44b57196a454d10628d1cce1bfd60bd2 Mon Sep 17 00:00:00 2001 From: Philipp Krones Date: Mon, 25 May 2020 17:11:07 +0200 Subject: [PATCH 0101/4780] Also fetch origin before merging master into the rustup branch --- CONTRIBUTING.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index c9180e58f..0f47ac98f 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -183,8 +183,8 @@ to be run inside the `rust` directory): `rust-clippy` repo (this has to be done in the Clippy repo, not in the rust-copy of Clippy): ```bash + git fetch origin && git fetch upstream git checkout sync-from-rust - git fetch upstream git merge upstream/master ``` 3. Open a PR to `rust-lang/rust-clippy` and wait for it to get merged (to From cff5cff2f3a6687dfaf12b92762e70545e0abefe Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Fri, 22 May 2020 22:30:28 +0200 Subject: [PATCH 0102/4780] Make the name of the crate available in cargo UI tests --- clippy_dev/src/new_lint.rs | 17 ++++++++++++----- .../cargo_common_metadata/fail/src/main.rs | 1 + .../cargo_common_metadata/pass/src/main.rs | 1 + .../multiple_crate_versions/fail/src/main.rs | 1 + .../multiple_crate_versions/pass/src/main.rs | 1 + .../wildcard_dependencies/fail/src/main.rs | 1 + .../wildcard_dependencies/pass/src/main.rs | 1 + 7 files changed, 18 insertions(+), 5 deletions(-) diff --git a/clippy_dev/src/new_lint.rs b/clippy_dev/src/new_lint.rs index 08a2e0c09..c0b2dac2f 100644 --- a/clippy_dev/src/new_lint.rs +++ b/clippy_dev/src/new_lint.rs @@ -76,7 +76,8 @@ fn create_test(lint: &LintData) -> io::Result<()> { path.push("src"); fs::create_dir(&path)?; - write_file(path.join("main.rs"), get_test_file_contents(lint_name))?; + let header = format!("// compile-flags: --crate-name={}", lint_name); + write_file(path.join("main.rs"), get_test_file_contents(lint_name, Some(&header)))?; Ok(()) } @@ -90,7 +91,7 @@ fn create_test(lint: &LintData) -> io::Result<()> { create_project_layout(lint.name, &test_dir, "pass", "This file should not trigger the lint") } else { let test_path = format!("tests/ui/{}.rs", lint.name); - let test_contents = get_test_file_contents(lint.name); + let test_contents = get_test_file_contents(lint.name, None); write_file(lint.project_root.join(test_path), test_contents) } } @@ -119,8 +120,8 @@ fn to_camel_case(name: &str) -> String { .collect() } -fn get_test_file_contents(lint_name: &str) -> String { - format!( +fn get_test_file_contents(lint_name: &str, header_commands: Option<&str>) -> String { + let mut contents = format!( "#![warn(clippy::{})] fn main() {{ @@ -128,7 +129,13 @@ fn main() {{ }} ", lint_name - ) + ); + + if let Some(header) = header_commands { + contents = format!("{}\n{}", header, contents); + } + + contents } fn get_manifest_contents(lint_name: &str, hint: &str) -> String { diff --git a/tests/ui-cargo/cargo_common_metadata/fail/src/main.rs b/tests/ui-cargo/cargo_common_metadata/fail/src/main.rs index c67166fc4..27841e18a 100644 --- a/tests/ui-cargo/cargo_common_metadata/fail/src/main.rs +++ b/tests/ui-cargo/cargo_common_metadata/fail/src/main.rs @@ -1,3 +1,4 @@ +// compile-flags: --crate-name=cargo_common_metadata #![warn(clippy::cargo_common_metadata)] fn main() {} diff --git a/tests/ui-cargo/cargo_common_metadata/pass/src/main.rs b/tests/ui-cargo/cargo_common_metadata/pass/src/main.rs index c67166fc4..27841e18a 100644 --- a/tests/ui-cargo/cargo_common_metadata/pass/src/main.rs +++ b/tests/ui-cargo/cargo_common_metadata/pass/src/main.rs @@ -1,3 +1,4 @@ +// compile-flags: --crate-name=cargo_common_metadata #![warn(clippy::cargo_common_metadata)] fn main() {} diff --git a/tests/ui-cargo/multiple_crate_versions/fail/src/main.rs b/tests/ui-cargo/multiple_crate_versions/fail/src/main.rs index 4bc61dd62..1b2d3ec94 100644 --- a/tests/ui-cargo/multiple_crate_versions/fail/src/main.rs +++ b/tests/ui-cargo/multiple_crate_versions/fail/src/main.rs @@ -1,3 +1,4 @@ +// compile-flags: --crate-name=multiple_crate_versions #![warn(clippy::multiple_crate_versions)] fn main() {} diff --git a/tests/ui-cargo/multiple_crate_versions/pass/src/main.rs b/tests/ui-cargo/multiple_crate_versions/pass/src/main.rs index 4bc61dd62..1b2d3ec94 100644 --- a/tests/ui-cargo/multiple_crate_versions/pass/src/main.rs +++ b/tests/ui-cargo/multiple_crate_versions/pass/src/main.rs @@ -1,3 +1,4 @@ +// compile-flags: --crate-name=multiple_crate_versions #![warn(clippy::multiple_crate_versions)] fn main() {} diff --git a/tests/ui-cargo/wildcard_dependencies/fail/src/main.rs b/tests/ui-cargo/wildcard_dependencies/fail/src/main.rs index 3491ccb0d..581babfea 100644 --- a/tests/ui-cargo/wildcard_dependencies/fail/src/main.rs +++ b/tests/ui-cargo/wildcard_dependencies/fail/src/main.rs @@ -1,3 +1,4 @@ +// compile-flags: --crate-name=wildcard_dependencies #![warn(clippy::wildcard_dependencies)] fn main() {} diff --git a/tests/ui-cargo/wildcard_dependencies/pass/src/main.rs b/tests/ui-cargo/wildcard_dependencies/pass/src/main.rs index 3491ccb0d..581babfea 100644 --- a/tests/ui-cargo/wildcard_dependencies/pass/src/main.rs +++ b/tests/ui-cargo/wildcard_dependencies/pass/src/main.rs @@ -1,3 +1,4 @@ +// compile-flags: --crate-name=wildcard_dependencies #![warn(clippy::wildcard_dependencies)] fn main() {} From 8642fc97dd1a9b4f0291726c47ec97d15599d74d Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Fri, 22 May 2020 22:39:19 +0200 Subject: [PATCH 0103/4780] multiple_crate_versions: skip dev and build deps --- clippy_lints/src/multiple_crate_versions.rs | 59 ++++++++++++++----- .../5041_allow_dev_build/Cargo.toml | 17 ++++++ .../5041_allow_dev_build/src/main.rs | 4 ++ 3 files changed, 66 insertions(+), 14 deletions(-) create mode 100644 tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/Cargo.toml create mode 100644 tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/src/main.rs diff --git a/clippy_lints/src/multiple_crate_versions.rs b/clippy_lints/src/multiple_crate_versions.rs index c4decfc94..b24ec897e 100644 --- a/clippy_lints/src/multiple_crate_versions.rs +++ b/clippy_lints/src/multiple_crate_versions.rs @@ -1,11 +1,14 @@ //! lint on multiple versions of a crate being used use crate::utils::{run_lints, span_lint}; +use rustc_hir::def_id::LOCAL_CRATE; use rustc_hir::{Crate, CRATE_HIR_ID}; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::DUMMY_SP; +use cargo_metadata::{DependencyKind, MetadataCommand, Node, Package, PackageId}; +use if_chain::if_chain; use itertools::Itertools; declare_clippy_lint! { @@ -34,37 +37,65 @@ declare_clippy_lint! { declare_lint_pass!(MultipleCrateVersions => [MULTIPLE_CRATE_VERSIONS]); impl LateLintPass<'_, '_> for MultipleCrateVersions { + #[allow(clippy::find_map)] fn check_crate(&mut self, cx: &LateContext<'_, '_>, _: &Crate<'_>) { if !run_lints(cx, &[MULTIPLE_CRATE_VERSIONS], CRATE_HIR_ID) { return; } - let metadata = if let Ok(metadata) = cargo_metadata::MetadataCommand::new().exec() { + let metadata = if let Ok(metadata) = MetadataCommand::new().exec() { metadata } else { span_lint(cx, MULTIPLE_CRATE_VERSIONS, DUMMY_SP, "could not read cargo metadata"); - return; }; + let local_name = cx.tcx.crate_name(LOCAL_CRATE).as_str(); let mut packages = metadata.packages; packages.sort_by(|a, b| a.name.cmp(&b.name)); - for (name, group) in &packages.into_iter().group_by(|p| p.name.clone()) { - let group: Vec = group.collect(); + if_chain! { + if let Some(resolve) = &metadata.resolve; + if let Some(local_id) = packages.iter().find(|p| p.name == *local_name).map(|p| &p.id); + then { + for (name, group) in &packages.iter().group_by(|p| p.name.clone()) { + let group: Vec<&Package> = group.collect(); - if group.len() > 1 { - let mut versions: Vec<_> = group.into_iter().map(|p| p.version).collect(); - versions.sort(); - let versions = versions.iter().join(", "); + if group.len() <= 1 { + continue; + } - span_lint( - cx, - MULTIPLE_CRATE_VERSIONS, - DUMMY_SP, - &format!("multiple versions for dependency `{}`: {}", name, versions), - ); + if group.iter().all(|p| is_normal_dep(&resolve.nodes, local_id, &p.id)) { + let mut versions: Vec<_> = group.into_iter().map(|p| &p.version).collect(); + versions.sort(); + let versions = versions.iter().join(", "); + + span_lint( + cx, + MULTIPLE_CRATE_VERSIONS, + DUMMY_SP, + &format!("multiple versions for dependency `{}`: {}", name, versions), + ); + } + } } } } } + +fn is_normal_dep(nodes: &[Node], local_id: &PackageId, dep_id: &PackageId) -> bool { + fn depends_on(node: &Node, dep_id: &PackageId) -> bool { + node.deps.iter().any(|dep| { + dep.pkg == *dep_id + && dep + .dep_kinds + .iter() + .any(|info| matches!(info.kind, DependencyKind::Normal)) + }) + } + + nodes + .iter() + .filter(|node| depends_on(node, dep_id)) + .any(|node| node.id == *local_id || is_normal_dep(nodes, local_id, &node.id)) +} diff --git a/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/Cargo.toml b/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/Cargo.toml new file mode 100644 index 000000000..72731fbc7 --- /dev/null +++ b/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/Cargo.toml @@ -0,0 +1,17 @@ +# Should not lint for dev or build dependencies. See issue 5041. + +[package] +name = "multiple_crate_versions" +version = "0.1.0" +publish = false + +# One of the versions of winapi is only a dev dependency: allowed +[dependencies] +ctrlc = "=3.1.0" +[dev-dependencies] +ansi_term = "=0.11.0" + +# Both versions of winapi are a build dependency: allowed +[build-dependencies] +ctrlc = "=3.1.0" +ansi_term = "=0.11.0" diff --git a/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/src/main.rs b/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/src/main.rs new file mode 100644 index 000000000..1b2d3ec94 --- /dev/null +++ b/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/src/main.rs @@ -0,0 +1,4 @@ +// compile-flags: --crate-name=multiple_crate_versions +#![warn(clippy::multiple_crate_versions)] + +fn main() {} From ec0a00e53980619a6313ff4f01099a1aebcfd9e6 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Sun, 24 May 2020 21:17:54 +0200 Subject: [PATCH 0104/4780] Use find_map instead of find() + map() --- clippy_lints/src/multiple_crate_versions.rs | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/clippy_lints/src/multiple_crate_versions.rs b/clippy_lints/src/multiple_crate_versions.rs index b24ec897e..b6770804e 100644 --- a/clippy_lints/src/multiple_crate_versions.rs +++ b/clippy_lints/src/multiple_crate_versions.rs @@ -37,7 +37,6 @@ declare_clippy_lint! { declare_lint_pass!(MultipleCrateVersions => [MULTIPLE_CRATE_VERSIONS]); impl LateLintPass<'_, '_> for MultipleCrateVersions { - #[allow(clippy::find_map)] fn check_crate(&mut self, cx: &LateContext<'_, '_>, _: &Crate<'_>) { if !run_lints(cx, &[MULTIPLE_CRATE_VERSIONS], CRATE_HIR_ID) { return; @@ -56,7 +55,9 @@ impl LateLintPass<'_, '_> for MultipleCrateVersions { if_chain! { if let Some(resolve) = &metadata.resolve; - if let Some(local_id) = packages.iter().find(|p| p.name == *local_name).map(|p| &p.id); + if let Some(local_id) = packages + .iter() + .find_map(|p| if p.name == *local_name { Some(&p.id) } else { None }); then { for (name, group) in &packages.iter().group_by(|p| p.name.clone()) { let group: Vec<&Package> = group.collect(); From 4f8909fad986dda68a9dcd172eaa362b6fce105b Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sat, 9 May 2020 21:28:31 +0200 Subject: [PATCH 0105/4780] Extend `useless_conversion` lint with TryFrom --- clippy_lints/src/useless_conversion.rs | 47 ++++++++++++++++++++------ clippy_lints/src/utils/paths.rs | 1 + tests/ui/useless_conversion.stderr | 20 +++++------ tests/ui/useless_conversion_try.rs | 25 ++++++++++++++ tests/ui/useless_conversion_try.stderr | 39 +++++++++++++++++++++ 5 files changed, 112 insertions(+), 20 deletions(-) create mode 100644 tests/ui/useless_conversion_try.rs create mode 100644 tests/ui/useless_conversion_try.stderr diff --git a/clippy_lints/src/useless_conversion.rs b/clippy_lints/src/useless_conversion.rs index 959215189..0b080d9be 100644 --- a/clippy_lints/src/useless_conversion.rs +++ b/clippy_lints/src/useless_conversion.rs @@ -1,13 +1,16 @@ use crate::utils::{ - match_def_path, match_trait_method, paths, same_tys, snippet, snippet_with_macro_callsite, span_lint_and_sugg, + is_type_diagnostic_item, match_def_path, match_trait_method, paths, same_tys, snippet, snippet_with_macro_callsite, + span_lint_and_help, span_lint_and_sugg, }; +use if_chain::if_chain; use rustc_errors::Applicability; use rustc_hir::{Expr, ExprKind, HirId, MatchSource}; use rustc_lint::{LateContext, LateLintPass}; +use rustc_middle::ty; use rustc_session::{declare_tool_lint, impl_lint_pass}; declare_clippy_lint! { - /// **What it does:** Checks for `Into`/`From`/`IntoIter` calls that useless converts + /// **What it does:** Checks for `Into`, `From`, `TryFrom`,`IntoIter` calls that useless converts /// to the same type as caller. /// /// **Why is this bad?** Redundant code. @@ -26,7 +29,7 @@ declare_clippy_lint! { /// ``` pub USELESS_CONVERSION, complexity, - "calls to `Into`/`From`/`IntoIter` that performs useless conversions to the same type" + "calls to `Into`, `From`, `TryFrom`, `IntoIter` that performs useless conversions to the same type" } #[derive(Default)] @@ -68,7 +71,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { cx, USELESS_CONVERSION, e.span, - "useless conversion", + "Useless conversion to the same type", "consider removing `.into()`", sugg, Applicability::MachineApplicable, // snippet @@ -84,7 +87,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { cx, USELESS_CONVERSION, e.span, - "useless conversion", + "Useless conversion to the same type", "consider removing `.into_iter()`", sugg, Applicability::MachineApplicable, // snippet @@ -94,11 +97,35 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { }, ExprKind::Call(ref path, ref args) => { - if let ExprKind::Path(ref qpath) = path.kind { - if let Some(def_id) = cx.tables.qpath_res(qpath, path.hir_id).opt_def_id() { + if_chain! { + if args.len() == 1; + if let ExprKind::Path(ref qpath) = path.kind; + if let Some(def_id) = cx.tables.qpath_res(qpath, path.hir_id).opt_def_id(); + let a = cx.tables.expr_ty(e); + let b = cx.tables.expr_ty(&args[0]); + + then { + if_chain! { + if match_def_path(cx, def_id, &paths::TRY_FROM); + if is_type_diagnostic_item(cx, a, sym!(result_type)); + if let ty::Adt(_, substs) = a.kind; + if let Some(a_type) = substs.types().nth(0); + if same_tys(cx, a_type, b); + + then { + let hint = format!("consider removing `{}()`", snippet(cx, path.span, "TryFrom::try_from")); + span_lint_and_help( + cx, + USELESS_CONVERSION, + e.span, + "Useless conversion to the same type", + None, + &hint, + ); + } + } + if match_def_path(cx, def_id, &paths::FROM_FROM) { - let a = cx.tables.expr_ty(e); - let b = cx.tables.expr_ty(&args[0]); if same_tys(cx, a, b) { let sugg = snippet(cx, args[0].span.source_callsite(), "").into_owned(); let sugg_msg = @@ -107,7 +134,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { cx, USELESS_CONVERSION, e.span, - "useless conversion", + "Useless conversion to the same type", &sugg_msg, sugg, Applicability::MachineApplicable, // snippet diff --git a/clippy_lints/src/utils/paths.rs b/clippy_lints/src/utils/paths.rs index b3ad2ad9d..e00d72628 100644 --- a/clippy_lints/src/utils/paths.rs +++ b/clippy_lints/src/utils/paths.rs @@ -128,6 +128,7 @@ pub const TO_OWNED_METHOD: [&str; 4] = ["alloc", "borrow", "ToOwned", "to_owned" pub const TO_STRING: [&str; 3] = ["alloc", "string", "ToString"]; pub const TO_STRING_METHOD: [&str; 4] = ["alloc", "string", "ToString", "to_string"]; pub const TRANSMUTE: [&str; 4] = ["core", "intrinsics", "", "transmute"]; +pub const TRY_FROM: [&str; 4] = ["core", "convert", "TryFrom", "try_from"]; pub const TRY_FROM_ERROR: [&str; 4] = ["std", "ops", "Try", "from_error"]; pub const TRY_INTO_RESULT: [&str; 4] = ["std", "ops", "Try", "into_result"]; pub const VEC: [&str; 3] = ["alloc", "vec", "Vec"]; diff --git a/tests/ui/useless_conversion.stderr b/tests/ui/useless_conversion.stderr index 7df3507ed..0b2947f7d 100644 --- a/tests/ui/useless_conversion.stderr +++ b/tests/ui/useless_conversion.stderr @@ -1,4 +1,4 @@ -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:6:13 | LL | let _ = T::from(val); @@ -10,55 +10,55 @@ note: the lint level is defined here LL | #![deny(clippy::useless_conversion)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:7:5 | LL | val.into() | ^^^^^^^^^^ help: consider removing `.into()`: `val` -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:19:22 | LL | let _: i32 = 0i32.into(); | ^^^^^^^^^^^ help: consider removing `.into()`: `0i32` -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:51:21 | LL | let _: String = "foo".to_string().into(); | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `"foo".to_string()` -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:52:21 | LL | let _: String = From::from("foo".to_string()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `From::from()`: `"foo".to_string()` -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:53:13 | LL | let _ = String::from("foo".to_string()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `"foo".to_string()` -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:54:13 | LL | let _ = String::from(format!("A: {:04}", 123)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("A: {:04}", 123)` -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:55:13 | LL | let _ = "".lines().into_iter(); | ^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `"".lines()` -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:56:13 | LL | let _ = vec![1, 2, 3].into_iter().into_iter(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `vec![1, 2, 3].into_iter()` -error: useless conversion +error: Useless conversion to the same type --> $DIR/useless_conversion.rs:57:21 | LL | let _: String = format!("Hello {}", "world").into(); diff --git a/tests/ui/useless_conversion_try.rs b/tests/ui/useless_conversion_try.rs new file mode 100644 index 000000000..abf0c891b --- /dev/null +++ b/tests/ui/useless_conversion_try.rs @@ -0,0 +1,25 @@ +#![deny(clippy::useless_conversion)] + +use std::convert::TryFrom; + +fn test_generic(val: T) -> T { + T::try_from(val).unwrap() +} + +fn test_generic2 + Into, U: From>(val: T) { + let _ = U::try_from(val).unwrap(); +} + +fn main() { + test_generic(10i32); + test_generic2::(10i32); + + let _: String = TryFrom::try_from("foo").unwrap(); + let _ = String::try_from("foo").unwrap(); + #[allow(clippy::useless_conversion)] + let _ = String::try_from("foo").unwrap(); + + let _: String = TryFrom::try_from("foo".to_string()).unwrap(); + let _ = String::try_from("foo".to_string()).unwrap(); + let _ = String::try_from(format!("A: {:04}", 123)).unwrap(); +} diff --git a/tests/ui/useless_conversion_try.stderr b/tests/ui/useless_conversion_try.stderr new file mode 100644 index 000000000..b3cb01fbe --- /dev/null +++ b/tests/ui/useless_conversion_try.stderr @@ -0,0 +1,39 @@ +error: Useless conversion to the same type + --> $DIR/useless_conversion_try.rs:6:5 + | +LL | T::try_from(val).unwrap() + | ^^^^^^^^^^^^^^^^ + | +note: the lint level is defined here + --> $DIR/useless_conversion_try.rs:1:9 + | +LL | #![deny(clippy::useless_conversion)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^ + = help: consider removing `T::try_from()` + +error: Useless conversion to the same type + --> $DIR/useless_conversion_try.rs:22:21 + | +LL | let _: String = TryFrom::try_from("foo".to_string()).unwrap(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider removing `TryFrom::try_from()` + +error: Useless conversion to the same type + --> $DIR/useless_conversion_try.rs:23:13 + | +LL | let _ = String::try_from("foo".to_string()).unwrap(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider removing `String::try_from()` + +error: Useless conversion to the same type + --> $DIR/useless_conversion_try.rs:24:13 + | +LL | let _ = String::try_from(format!("A: {:04}", 123)).unwrap(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider removing `String::try_from()` + +error: aborting due to 4 previous errors + From 705bfdcc467c0ddd7eb61d3adb24809b27bae891 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Fri, 22 May 2020 11:46:17 +0200 Subject: [PATCH 0106/4780] Extend `useless_conversion` lint with TryInto --- clippy_lints/src/useless_conversion.rs | 38 +++++++++++++++++++++----- clippy_lints/src/utils/paths.rs | 1 + src/lintlist/mod.rs | 2 +- tests/ui/useless_conversion_try.rs | 17 +++++++++--- tests/ui/useless_conversion_try.stderr | 38 +++++++++++++++++++++----- 5 files changed, 77 insertions(+), 19 deletions(-) diff --git a/clippy_lints/src/useless_conversion.rs b/clippy_lints/src/useless_conversion.rs index 0b080d9be..1645c5777 100644 --- a/clippy_lints/src/useless_conversion.rs +++ b/clippy_lints/src/useless_conversion.rs @@ -10,8 +10,8 @@ use rustc_middle::ty; use rustc_session::{declare_tool_lint, impl_lint_pass}; declare_clippy_lint! { - /// **What it does:** Checks for `Into`, `From`, `TryFrom`,`IntoIter` calls that useless converts - /// to the same type as caller. + /// **What it does:** Checks for `Into`, `TryInto`, `From`, `TryFrom`,`IntoIter` calls + /// that useless converts to the same type as caller. /// /// **Why is this bad?** Redundant code. /// @@ -29,7 +29,7 @@ declare_clippy_lint! { /// ``` pub USELESS_CONVERSION, complexity, - "calls to `Into`, `From`, `TryFrom`, `IntoIter` that performs useless conversions to the same type" + "calls to `Into`, `TryInto`, `From`, `TryFrom`, `IntoIter` that performs useless conversions to the same type" } #[derive(Default)] @@ -39,6 +39,7 @@ pub struct UselessConversion { impl_lint_pass!(UselessConversion => [USELESS_CONVERSION]); +#[allow(clippy::too_many_lines)] impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr<'_>) { if e.span.from_expansion() { @@ -66,7 +67,6 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { let b = cx.tables.expr_ty(&args[0]); if same_tys(cx, a, b) { let sugg = snippet_with_macro_callsite(cx, args[0].span, "").to_string(); - span_lint_and_sugg( cx, USELESS_CONVERSION, @@ -94,6 +94,27 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { ); } } + if match_trait_method(cx, e, &paths::TRY_INTO_TRAIT) && &*name.ident.as_str() == "try_into" { + if_chain! { + let a = cx.tables.expr_ty(e); + let b = cx.tables.expr_ty(&args[0]); + if is_type_diagnostic_item(cx, a, sym!(result_type)); + if let ty::Adt(_, substs) = a.kind; + if let Some(a_type) = substs.types().next(); + if same_tys(cx, a_type, b); + + then { + span_lint_and_help( + cx, + USELESS_CONVERSION, + e.span, + "Useless conversion to the same type", + None, + "consider removing `.try_into()`", + ); + } + } + } }, ExprKind::Call(ref path, ref args) => { @@ -109,7 +130,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { if match_def_path(cx, def_id, &paths::TRY_FROM); if is_type_diagnostic_item(cx, a, sym!(result_type)); if let ty::Adt(_, substs) = a.kind; - if let Some(a_type) = substs.types().nth(0); + if let Some(a_type) = substs.types().next(); if same_tys(cx, a_type, b); then { @@ -125,8 +146,11 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { } } - if match_def_path(cx, def_id, &paths::FROM_FROM) { - if same_tys(cx, a, b) { + if_chain! { + if match_def_path(cx, def_id, &paths::FROM_FROM); + if same_tys(cx, a, b); + + then { let sugg = snippet(cx, args[0].span.source_callsite(), "").into_owned(); let sugg_msg = format!("consider removing `{}()`", snippet(cx, path.span, "From::from")); diff --git a/clippy_lints/src/utils/paths.rs b/clippy_lints/src/utils/paths.rs index e00d72628..779da7e6b 100644 --- a/clippy_lints/src/utils/paths.rs +++ b/clippy_lints/src/utils/paths.rs @@ -131,6 +131,7 @@ pub const TRANSMUTE: [&str; 4] = ["core", "intrinsics", "", "transmute"]; pub const TRY_FROM: [&str; 4] = ["core", "convert", "TryFrom", "try_from"]; pub const TRY_FROM_ERROR: [&str; 4] = ["std", "ops", "Try", "from_error"]; pub const TRY_INTO_RESULT: [&str; 4] = ["std", "ops", "Try", "into_result"]; +pub const TRY_INTO_TRAIT: [&str; 3] = ["core", "convert", "TryInto"]; pub const VEC: [&str; 3] = ["alloc", "vec", "Vec"]; pub const VEC_AS_MUT_SLICE: [&str; 4] = ["alloc", "vec", "Vec", "as_mut_slice"]; pub const VEC_AS_SLICE: [&str; 4] = ["alloc", "vec", "Vec", "as_slice"]; diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 8211a57b5..f63301c7d 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -2421,7 +2421,7 @@ pub static ref ALL_LINTS: Vec = vec![ Lint { name: "useless_conversion", group: "complexity", - desc: "calls to `Into`/`From`/`IntoIter` that performs useless conversions to the same type", + desc: "calls to `Into`, `TryInto`, `From`, `TryFrom`, `IntoIter` that performs useless conversions to the same type", deprecation: None, module: "useless_conversion", }, diff --git a/tests/ui/useless_conversion_try.rs b/tests/ui/useless_conversion_try.rs index abf0c891b..ab4f960ed 100644 --- a/tests/ui/useless_conversion_try.rs +++ b/tests/ui/useless_conversion_try.rs @@ -1,12 +1,16 @@ #![deny(clippy::useless_conversion)] -use std::convert::TryFrom; +use std::convert::{TryFrom, TryInto}; fn test_generic(val: T) -> T { - T::try_from(val).unwrap() + let _ = T::try_from(val).unwrap(); + val.try_into().unwrap() } fn test_generic2 + Into, U: From>(val: T) { + // ok + let _: i32 = val.try_into().unwrap(); + let _: U = val.try_into().unwrap(); let _ = U::try_from(val).unwrap(); } @@ -14,12 +18,17 @@ fn main() { test_generic(10i32); test_generic2::(10i32); + let _: String = "foo".try_into().unwrap(); let _: String = TryFrom::try_from("foo").unwrap(); let _ = String::try_from("foo").unwrap(); #[allow(clippy::useless_conversion)] - let _ = String::try_from("foo").unwrap(); - + { + let _ = String::try_from("foo").unwrap(); + let _: String = "foo".try_into().unwrap(); + } + let _: String = "foo".to_string().try_into().unwrap(); let _: String = TryFrom::try_from("foo".to_string()).unwrap(); let _ = String::try_from("foo".to_string()).unwrap(); let _ = String::try_from(format!("A: {:04}", 123)).unwrap(); + let _: String = format!("Hello {}", "world").try_into().unwrap(); } diff --git a/tests/ui/useless_conversion_try.stderr b/tests/ui/useless_conversion_try.stderr index b3cb01fbe..5afb5dc45 100644 --- a/tests/ui/useless_conversion_try.stderr +++ b/tests/ui/useless_conversion_try.stderr @@ -1,8 +1,8 @@ error: Useless conversion to the same type - --> $DIR/useless_conversion_try.rs:6:5 + --> $DIR/useless_conversion_try.rs:6:13 | -LL | T::try_from(val).unwrap() - | ^^^^^^^^^^^^^^^^ +LL | let _ = T::try_from(val).unwrap(); + | ^^^^^^^^^^^^^^^^ | note: the lint level is defined here --> $DIR/useless_conversion_try.rs:1:9 @@ -12,7 +12,23 @@ LL | #![deny(clippy::useless_conversion)] = help: consider removing `T::try_from()` error: Useless conversion to the same type - --> $DIR/useless_conversion_try.rs:22:21 + --> $DIR/useless_conversion_try.rs:7:5 + | +LL | val.try_into().unwrap() + | ^^^^^^^^^^^^^^ + | + = help: consider removing `.try_into()` + +error: Useless conversion to the same type + --> $DIR/useless_conversion_try.rs:29:21 + | +LL | let _: String = "foo".to_string().try_into().unwrap(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider removing `.try_into()` + +error: Useless conversion to the same type + --> $DIR/useless_conversion_try.rs:30:21 | LL | let _: String = TryFrom::try_from("foo".to_string()).unwrap(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -20,7 +36,7 @@ LL | let _: String = TryFrom::try_from("foo".to_string()).unwrap(); = help: consider removing `TryFrom::try_from()` error: Useless conversion to the same type - --> $DIR/useless_conversion_try.rs:23:13 + --> $DIR/useless_conversion_try.rs:31:13 | LL | let _ = String::try_from("foo".to_string()).unwrap(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -28,12 +44,20 @@ LL | let _ = String::try_from("foo".to_string()).unwrap(); = help: consider removing `String::try_from()` error: Useless conversion to the same type - --> $DIR/useless_conversion_try.rs:24:13 + --> $DIR/useless_conversion_try.rs:32:13 | LL | let _ = String::try_from(format!("A: {:04}", 123)).unwrap(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: consider removing `String::try_from()` -error: aborting due to 4 previous errors +error: Useless conversion to the same type + --> $DIR/useless_conversion_try.rs:33:21 + | +LL | let _: String = format!("Hello {}", "world").try_into().unwrap(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider removing `.try_into()` + +error: aborting due to 7 previous errors From 827041252c709dee70756633a33a13a0bacbd3a9 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sat, 23 May 2020 09:35:56 +0200 Subject: [PATCH 0107/4780] Add common lint tools doc --- doc/adding_lints.md | 1 + doc/common_tools_writing_lints.md | 152 ++++++++++++++++++++++++++++++ 2 files changed, 153 insertions(+) create mode 100644 doc/common_tools_writing_lints.md diff --git a/doc/adding_lints.md b/doc/adding_lints.md index b3f5a62d5..8092be277 100644 --- a/doc/adding_lints.md +++ b/doc/adding_lints.md @@ -465,6 +465,7 @@ Here are some pointers to things you are likely going to need for every lint: * [`from_expansion`][from_expansion] and [`in_external_macro`][in_external_macro] * [`Span`][span] * [`Applicability`][applicability] +* [Common tools for writing lints](common_tools_writing_lints.md) helps with common operations * [The rustc-dev-guide][rustc-dev-guide] explains a lot of internal compiler concepts * [The nightly rustc docs][nightly_docs] which has been linked to throughout this guide diff --git a/doc/common_tools_writing_lints.md b/doc/common_tools_writing_lints.md new file mode 100644 index 000000000..ed33b37c6 --- /dev/null +++ b/doc/common_tools_writing_lints.md @@ -0,0 +1,152 @@ +# Common tools for writing lints + +You may need following tooltips to catch up with common operations. + +- [Common tools for writing lints](#common-tools-for-writing-lints) + - [Retrieving the type of an expression](#retrieving-the-type-of-an-expression) + - [Checking if a type implements a specific trait](#checking-if-a-type-implements-a-specific-trait) + - [Dealing with macros](#dealing-with-macros) + +Useful Rustc dev guide links: +- [Stages of compilation](https://rustc-dev-guide.rust-lang.org/compiler-src.html#the-main-stages-of-compilation) +- [Type checking](https://rustc-dev-guide.rust-lang.org/type-checking.html) +- [Ty module](https://rustc-dev-guide.rust-lang.org/ty.html) + +# Retrieving the type of an expression + +Sometimes you may want to retrieve the type `Ty` of an expression `Expr`, for example to answer following questions: + +- which type does this expression correspond to (using its [`TyKind`][TyKind])? +- is it a sized type? +- is it a primitive type? +- does it implement a trait? + +This operation is performed using the [`expr_ty()`][expr_ty] method from the [`TypeckTables`][TypeckTables] struct, +that gives you access to the underlying structure [`TyS`][TyS]. + +Example of use: +```rust +impl LateLintPass<'_, '_> for MyStructLint { + fn check_expr(&mut self, cx: &LateContext<'_, '_>, expr: &Expr<'_>) { + // Get type of `expr` + let ty = cx.tables.expr_ty(expr); + // Match its kind to enter its type + match ty.kind { + ty::Adt(adt_def, _) if adt_def.is_struct() => println!("Our `expr` is a struct!"), + _ => () + } + } +} +``` + +Similarly in [`TypeckTables`][TypeckTables] methods, you have the [`pat_ty()`][pat_ty] method +to retrieve a type from a pattern. + +Two noticeable items here: +- `cx` is the lint context [`LateContext`][LateContext]. + The two most useful data structures in this context are `tcx` and `tables`, + allowing us to jump to type definitions and other compilation stages such as HIR. +- `tables` is [`TypeckTables`][TypeckTables] and is created by type checking step, + it includes useful information such as types of expressions, ways to resolve methods and so on. + +# Checking if a type implements a specific trait + +There are two ways to do this, depending if the target trait is part of lang items. + +```rust +use crate::utils::{implements_trait, match_trait_method, paths}; + +impl LateLintPass<'_, '_> for MyStructLint { + fn check_expr(&mut self, cx: &LateContext<'_, '_>, expr: &Expr<'_>) { + // 1. Using expression and Clippy's convenient method + // we use `match_trait_method` function from Clippy's toolbox + if match_trait_method(cx, expr, &paths::INTO) { + // `expr` implements `Into` trait + } + + // 2. Using type context `TyCtxt` + let ty = cx.tables.expr_ty(expr); + if cx.tcx.lang_items() + // we are looking for the `DefId` of `Drop` trait in lang items + .drop_trait() + // then we use it with our type `ty` by calling `implements_trait` from Clippy's utils + .map_or(false, |id| implements_trait(cx, ty, id, &[])) { + // `expr` implements `Drop` trait + } + } +} +``` + +> Prefer using lang items, if the target trait is available there. + +A list of defined paths for Clippy can be found in [paths.rs][paths] + +We access lang items through the type context `tcx`. `tcx` is of type [`TyCtxt`][TyCtxt] and is defined in the `rustc_middle` crate. + +# Dealing with macros + +There are several helpers in Clippy's utils to deal with macros: + +- `in_macro()`: detect if the given span is expanded by a macro + +You may want to use this for example to not start linting in any macro. + +```rust +macro_rules! foo { + ($param:expr) => { + match $param { + "bar" => println!("whatever"), + _ => () + } + }; +} + +foo!("bar"); + +// if we lint the `match` of `foo` call and test its span +assert_eq!(in_macro(match_span), true); +``` + +- `in_external_macro()`: detect if the given span is from an external macro, defined in a foreign crate + +You may want to use it for example to not start linting in macros from other crates + +```rust +#[macro_use] +extern crate a_crate_with_macros; + +// `foo` is defined in `a_crate_with_macros` +foo!("bar"); + +// if we lint the `match` of `foo` call and test its span +assert_eq!(in_external_macro(cx.sess(), match_span), true); +``` + +- `differing_macro_contexts()`: returns true if the two given spans are not from the same context + +```rust +macro_rules! m { + ($a:expr, $b:expr) => { + if $a.is_some() { + $b; + } + } +} + +let x: Option = Some(42); +m!(x, x.unwrap()); + +// These spans are not from the same context +// x.is_some() is from inside the macro +// x.unwrap() is from outside the macro +assert_eq!(differing_macro_contexts(x_is_some_span, x_unwrap_span), true); +``` + +[TyS]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TyS.html +[TyKind]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/enum.TyKind.html +[TypeckTables]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TypeckTables.html +[expr_ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TypeckTables.html#method.expr_ty +[LateContext]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LateContext.html +[TyCtxt]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TyCtxt.html +[pat_ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TypeckTables.html#method.pat_ty +[paths]: ../clippy_lints/src/utils/paths.rs From 60d38ee1dde4344daa5fdf716eef78b45f483c7e Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Sat, 23 May 2020 22:07:03 +0200 Subject: [PATCH 0108/4780] reversed_empty_ranges: add suggestion for &slice[N..N] --- clippy_lints/src/ranges.rs | 30 ++++++++++++++----- tests/ui/reversed_empty_ranges_fixable.fixed | 7 ++++- tests/ui/reversed_empty_ranges_fixable.rs | 7 ++++- tests/ui/reversed_empty_ranges_fixable.stderr | 16 ++++++---- tests/ui/reversed_empty_ranges_unfixable.rs | 1 - .../ui/reversed_empty_ranges_unfixable.stderr | 10 ++----- 6 files changed, 47 insertions(+), 24 deletions(-) diff --git a/clippy_lints/src/ranges.rs b/clippy_lints/src/ranges.rs index 83c6faac0..1eb26d97e 100644 --- a/clippy_lints/src/ranges.rs +++ b/clippy_lints/src/ranges.rs @@ -241,14 +241,14 @@ fn check_inclusive_range_minus_one(cx: &LateContext<'_, '_>, expr: &Expr<'_>) { } fn check_reversed_empty_range(cx: &LateContext<'_, '_>, expr: &Expr<'_>) { - fn inside_indexing_expr(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { - matches!( - get_parent_expr(cx, expr), - Some(Expr { + fn inside_indexing_expr<'a>(cx: &'a LateContext<'_, '_>, expr: &Expr<'_>) -> Option<&'a Expr<'a>> { + match get_parent_expr(cx, expr) { + parent_expr @ Some(Expr { kind: ExprKind::Index(..), .. - }) - ) + }) => parent_expr, + _ => None, + } } fn is_empty_range(limits: RangeLimits, ordering: Ordering) -> bool { @@ -267,18 +267,32 @@ fn check_reversed_empty_range(cx: &LateContext<'_, '_>, expr: &Expr<'_>) { if let Some(ordering) = Constant::partial_cmp(cx.tcx, ty, &start_idx, &end_idx); if is_empty_range(limits, ordering); then { - if inside_indexing_expr(cx, expr) { + if let Some(parent_expr) = inside_indexing_expr(cx, expr) { let (reason, outcome) = if ordering == Ordering::Equal { ("empty", "always yield an empty slice") } else { ("reversed", "panic at run-time") }; - span_lint( + span_lint_and_then( cx, REVERSED_EMPTY_RANGES, expr.span, &format!("this range is {} and using it to index a slice will {}", reason, outcome), + |diag| { + if_chain! { + if ordering == Ordering::Equal; + if let ty::Slice(slice_ty) = cx.tables.expr_ty(parent_expr).kind; + then { + diag.span_suggestion( + parent_expr.span, + "if you want an empty slice, use", + format!("[] as &[{}]", slice_ty), + Applicability::MaybeIncorrect + ); + } + } + } ); } else { span_lint_and_then( diff --git a/tests/ui/reversed_empty_ranges_fixable.fixed b/tests/ui/reversed_empty_ranges_fixable.fixed index ee2cbc3cf..332c0427e 100644 --- a/tests/ui/reversed_empty_ranges_fixable.fixed +++ b/tests/ui/reversed_empty_ranges_fixable.fixed @@ -4,18 +4,23 @@ const ANSWER: i32 = 42; fn main() { + let arr = [1, 2, 3, 4, 5]; + + // These should be linted: + (21..=42).rev().for_each(|x| println!("{}", x)); let _ = (21..ANSWER).rev().filter(|x| x % 2 == 0).take(10).collect::>(); for _ in (-42..=-21).rev() {} for _ in (21u32..42u32).rev() {} + let _ = &[] as &[i32]; + // These should be ignored as they are not empty ranges: (21..=42).for_each(|x| println!("{}", x)); (21..42).for_each(|x| println!("{}", x)); - let arr = [1, 2, 3, 4, 5]; let _ = &arr[1..=3]; let _ = &arr[1..3]; diff --git a/tests/ui/reversed_empty_ranges_fixable.rs b/tests/ui/reversed_empty_ranges_fixable.rs index 6ed5ca6da..901ec8bcc 100644 --- a/tests/ui/reversed_empty_ranges_fixable.rs +++ b/tests/ui/reversed_empty_ranges_fixable.rs @@ -4,18 +4,23 @@ const ANSWER: i32 = 42; fn main() { + let arr = [1, 2, 3, 4, 5]; + + // These should be linted: + (42..=21).for_each(|x| println!("{}", x)); let _ = (ANSWER..21).filter(|x| x % 2 == 0).take(10).collect::>(); for _ in -21..=-42 {} for _ in 42u32..21u32 {} + let _ = &arr[3..3]; + // These should be ignored as they are not empty ranges: (21..=42).for_each(|x| println!("{}", x)); (21..42).for_each(|x| println!("{}", x)); - let arr = [1, 2, 3, 4, 5]; let _ = &arr[1..=3]; let _ = &arr[1..3]; diff --git a/tests/ui/reversed_empty_ranges_fixable.stderr b/tests/ui/reversed_empty_ranges_fixable.stderr index 97933b8ff..9a646fd99 100644 --- a/tests/ui/reversed_empty_ranges_fixable.stderr +++ b/tests/ui/reversed_empty_ranges_fixable.stderr @@ -1,5 +1,5 @@ error: this range is empty so it will yield no values - --> $DIR/reversed_empty_ranges_fixable.rs:7:5 + --> $DIR/reversed_empty_ranges_fixable.rs:11:5 | LL | (42..=21).for_each(|x| println!("{}", x)); | ^^^^^^^^^ @@ -11,7 +11,7 @@ LL | (21..=42).rev().for_each(|x| println!("{}", x)); | ^^^^^^^^^^^^^^^ error: this range is empty so it will yield no values - --> $DIR/reversed_empty_ranges_fixable.rs:8:13 + --> $DIR/reversed_empty_ranges_fixable.rs:12:13 | LL | let _ = (ANSWER..21).filter(|x| x % 2 == 0).take(10).collect::>(); | ^^^^^^^^^^^^ @@ -22,7 +22,7 @@ LL | let _ = (21..ANSWER).rev().filter(|x| x % 2 == 0).take(10).collect:: $DIR/reversed_empty_ranges_fixable.rs:10:14 + --> $DIR/reversed_empty_ranges_fixable.rs:14:14 | LL | for _ in -21..=-42 {} | ^^^^^^^^^ @@ -33,7 +33,7 @@ LL | for _ in (-42..=-21).rev() {} | ^^^^^^^^^^^^^^^^^ error: this range is empty so it will yield no values - --> $DIR/reversed_empty_ranges_fixable.rs:11:14 + --> $DIR/reversed_empty_ranges_fixable.rs:15:14 | LL | for _ in 42u32..21u32 {} | ^^^^^^^^^^^^ @@ -43,5 +43,11 @@ help: consider using the following if you are attempting to iterate over this ra LL | for _ in (21u32..42u32).rev() {} | ^^^^^^^^^^^^^^^^^^^^ -error: aborting due to 4 previous errors +error: this range is empty and using it to index a slice will always yield an empty slice + --> $DIR/reversed_empty_ranges_fixable.rs:17:18 + | +LL | let _ = &arr[3..3]; + | ----^^^^- help: if you want an empty slice, use: `[] as &[i32]` + +error: aborting due to 5 previous errors diff --git a/tests/ui/reversed_empty_ranges_unfixable.rs b/tests/ui/reversed_empty_ranges_unfixable.rs index c9ca4c476..561a35625 100644 --- a/tests/ui/reversed_empty_ranges_unfixable.rs +++ b/tests/ui/reversed_empty_ranges_unfixable.rs @@ -9,7 +9,6 @@ fn main() { let arr = [1, 2, 3, 4, 5]; let _ = &arr[3usize..=1usize]; let _ = &arr[SOME_NUM..1]; - let _ = &arr[3..3]; for _ in ANSWER..ANSWER {} } diff --git a/tests/ui/reversed_empty_ranges_unfixable.stderr b/tests/ui/reversed_empty_ranges_unfixable.stderr index 12e5483ec..240188cbb 100644 --- a/tests/ui/reversed_empty_ranges_unfixable.stderr +++ b/tests/ui/reversed_empty_ranges_unfixable.stderr @@ -18,17 +18,11 @@ error: this range is reversed and using it to index a slice will panic at run-ti LL | let _ = &arr[SOME_NUM..1]; | ^^^^^^^^^^^ -error: this range is empty and using it to index a slice will always yield an empty slice - --> $DIR/reversed_empty_ranges_unfixable.rs:12:18 - | -LL | let _ = &arr[3..3]; - | ^^^^ - error: this range is empty so it will yield no values - --> $DIR/reversed_empty_ranges_unfixable.rs:14:14 + --> $DIR/reversed_empty_ranges_unfixable.rs:13:14 | LL | for _ in ANSWER..ANSWER {} | ^^^^^^^^^^^^^^ -error: aborting due to 5 previous errors +error: aborting due to 4 previous errors From 6bd9cd99a3da53bdda4530dde9f737a843de6c91 Mon Sep 17 00:00:00 2001 From: Jeremy Stucki Date: Wed, 21 Aug 2019 21:18:43 +0200 Subject: [PATCH 0109/4780] Add tests --- tests/ui/or_fun_call.rs | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tests/ui/or_fun_call.rs b/tests/ui/or_fun_call.rs index 7599b945a..522f31b72 100644 --- a/tests/ui/or_fun_call.rs +++ b/tests/ui/or_fun_call.rs @@ -95,6 +95,15 @@ fn test_or_with_ctors() { let b = "b".to_string(); let _ = Some(Bar("a".to_string(), Duration::from_secs(1))) .or(Some(Bar(b, Duration::from_secs(2)))); + + let vec = vec!["foo"]; + let _ = opt.ok_or(vec.len()); + + let array = ["foo"]; + let _ = opt.ok_or(array.len()); + + let slice = &["foo"][..]; + let _ = opt.ok_or(slice.len()); } // Issue 4514 - early return From 566377f6272b0a3b9fa65dabe1f39ee82be80d4e Mon Sep 17 00:00:00 2001 From: Jeremy Stucki Date: Wed, 21 Aug 2019 21:19:28 +0200 Subject: [PATCH 0110/4780] Ignore calls to 'len' --- clippy_lints/src/methods/mod.rs | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index 32b3b7f79..c82cf57a4 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -1614,6 +1614,21 @@ fn lint_or_fun_call<'a, 'tcx>( or_has_args: bool, span: Span, ) { + if let hir::ExprKind::MethodCall(ref path, _, ref args) = &arg.node { + if path.ident.as_str() == "len" { + let ty = walk_ptrs_ty(cx.tables.expr_ty(&args[0])); + + match ty.sty { + ty::Slice(_) | ty::Array(_, _) => return, + _ => (), + } + + if match_type(cx, ty, &paths::VEC) { + return; + } + } + } + // (path, fn_has_argument, methods, suffix) let know_types: &[(&[_], _, &[_], _)] = &[ (&paths::BTREEMAP_ENTRY, false, &["or_insert"], "with"), From bcfeb4de1589c19a7b21f04fec284e6045c0aa7a Mon Sep 17 00:00:00 2001 From: Jeremy Stucki Date: Mon, 25 May 2020 21:23:39 +0200 Subject: [PATCH 0111/4780] Fix build --- clippy_lints/src/methods/mod.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index c82cf57a4..52ca962e7 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -1614,11 +1614,11 @@ fn lint_or_fun_call<'a, 'tcx>( or_has_args: bool, span: Span, ) { - if let hir::ExprKind::MethodCall(ref path, _, ref args) = &arg.node { + if let hir::ExprKind::MethodCall(ref path, _, ref args) = &arg.kind { if path.ident.as_str() == "len" { let ty = walk_ptrs_ty(cx.tables.expr_ty(&args[0])); - match ty.sty { + match ty.kind { ty::Slice(_) | ty::Array(_, _) => return, _ => (), } From d9f55322cccf1e1ca1b996f8431f7ff8836d5d55 Mon Sep 17 00:00:00 2001 From: Jeremy Stucki Date: Mon, 25 May 2020 21:38:46 +0200 Subject: [PATCH 0112/4780] Update ui test --- tests/ui/or_fun_call.fixed | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tests/ui/or_fun_call.fixed b/tests/ui/or_fun_call.fixed index 8ea03fe42..7bb08797e 100644 --- a/tests/ui/or_fun_call.fixed +++ b/tests/ui/or_fun_call.fixed @@ -95,6 +95,15 @@ fn test_or_with_ctors() { let b = "b".to_string(); let _ = Some(Bar("a".to_string(), Duration::from_secs(1))) .or(Some(Bar(b, Duration::from_secs(2)))); + + let vec = vec!["foo"]; + let _ = opt.ok_or(vec.len()); + + let array = ["foo"]; + let _ = opt.ok_or(array.len()); + + let slice = &["foo"][..]; + let _ = opt.ok_or(slice.len()); } // Issue 4514 - early return From f2154e98379fcdd42ef226b6e19e9dc218422f83 Mon Sep 17 00:00:00 2001 From: returntrip Date: Mon, 25 May 2020 23:06:08 +0200 Subject: [PATCH 0113/4780] To make it easier for Linux distributions, ship the licenses text within each crate directory. --- rustc_tools_util/LICENSE-APACHE | 1 + rustc_tools_util/LICENSE-MIT | 1 + 2 files changed, 2 insertions(+) create mode 120000 rustc_tools_util/LICENSE-APACHE create mode 120000 rustc_tools_util/LICENSE-MIT diff --git a/rustc_tools_util/LICENSE-APACHE b/rustc_tools_util/LICENSE-APACHE new file mode 120000 index 000000000..965b606f3 --- /dev/null +++ b/rustc_tools_util/LICENSE-APACHE @@ -0,0 +1 @@ +../LICENSE-APACHE \ No newline at end of file diff --git a/rustc_tools_util/LICENSE-MIT b/rustc_tools_util/LICENSE-MIT new file mode 120000 index 000000000..76219eb72 --- /dev/null +++ b/rustc_tools_util/LICENSE-MIT @@ -0,0 +1 @@ +../LICENSE-MIT \ No newline at end of file From a1824e187cb6d17e48e2ff039810551540a9b826 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 25 May 2020 23:09:06 +0200 Subject: [PATCH 0114/4780] ptr_arg: honor `allow` attr on arguments --- clippy_lints/src/ptr.rs | 10 +++++++++- clippy_lints/src/utils/sugg.rs | 2 +- tests/ui/ptr_arg.rs | 32 +++++++++++++++++++++++++++++++- 3 files changed, 41 insertions(+), 3 deletions(-) diff --git a/clippy_lints/src/ptr.rs b/clippy_lints/src/ptr.rs index 2cdf96714..4eac571f9 100644 --- a/clippy_lints/src/ptr.rs +++ b/clippy_lints/src/ptr.rs @@ -2,7 +2,7 @@ use crate::utils::ptr::get_spans; use crate::utils::{ - is_type_diagnostic_item, match_qpath, match_type, paths, snippet_opt, span_lint, span_lint_and_sugg, + is_allowed, is_type_diagnostic_item, match_qpath, match_type, paths, snippet_opt, span_lint, span_lint_and_sugg, span_lint_and_then, walk_ptrs_hir_ty, }; use if_chain::if_chain; @@ -150,8 +150,16 @@ fn check_fn(cx: &LateContext<'_, '_>, decl: &FnDecl<'_>, fn_id: HirId, opt_body_ let fn_def_id = cx.tcx.hir().local_def_id(fn_id); let sig = cx.tcx.fn_sig(fn_def_id); let fn_ty = sig.skip_binder(); + let body = opt_body_id.map(|id| cx.tcx.hir().body(id)); for (idx, (arg, ty)) in decl.inputs.iter().zip(fn_ty.inputs()).enumerate() { + // Honor the allow attribute on parameters. See issue 5644. + if let Some(body) = &body { + if is_allowed(cx, PTR_ARG, body.params[idx].hir_id) { + continue; + } + } + if let ty::Ref(_, ty, Mutability::Not) = ty.kind { if is_type_diagnostic_item(cx, ty, sym!(vec_type)) { let mut ty_snippet = None; diff --git a/clippy_lints/src/utils/sugg.rs b/clippy_lints/src/utils/sugg.rs index 4ebe2e285..73758b7ee 100644 --- a/clippy_lints/src/utils/sugg.rs +++ b/clippy_lints/src/utils/sugg.rs @@ -530,7 +530,7 @@ pub trait DiagnosticBuilderExt<'a, T: LintContext> { /// Suggest to add an item before another. /// - /// The item should not be indented (expect for inner indentation). + /// The item should not be indented (except for inner indentation). /// /// # Example /// diff --git a/tests/ui/ptr_arg.rs b/tests/ui/ptr_arg.rs index 30f39e9b0..541225e63 100644 --- a/tests/ui/ptr_arg.rs +++ b/tests/ui/ptr_arg.rs @@ -71,7 +71,6 @@ fn false_positive_capacity_too(x: &String) -> String { #[allow(dead_code)] fn test_cow_with_ref(c: &Cow<[i32]>) {} -#[allow(dead_code)] fn test_cow(c: Cow<[i32]>) { let _c = c; } @@ -84,3 +83,34 @@ trait Foo2 { impl Foo2 for String { fn do_string(&self) {} } + +// Check that the allow attribute on parameters is honored +mod issue_5644 { + use std::borrow::Cow; + + fn allowed( + #[allow(clippy::ptr_arg)] _v: &Vec, + #[allow(clippy::ptr_arg)] _s: &String, + #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>, + ) { + } + + struct S {} + impl S { + fn allowed( + #[allow(clippy::ptr_arg)] _v: &Vec, + #[allow(clippy::ptr_arg)] _s: &String, + #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>, + ) { + } + } + + trait T { + fn allowed( + #[allow(clippy::ptr_arg)] _v: &Vec, + #[allow(clippy::ptr_arg)] _s: &String, + #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>, + ) { + } + } +} From 67167be1679c60eefa2c314c5e4a2b673d5eef11 Mon Sep 17 00:00:00 2001 From: Philipp Hansch Date: Sun, 17 May 2020 18:14:43 +0200 Subject: [PATCH 0115/4780] Make empty_line_after_outer_attr an early lint --- clippy_lints/Cargo.toml | 4 + clippy_lints/src/attrs.rs | 75 +++++++++++-------- tests/compile-test.rs | 2 +- tests/ui/auxiliary/proc_macro_attr.rs | 37 +++++++++ tests/ui/empty_line_after_outer_attribute.rs | 19 ++++- .../empty_line_after_outer_attribute.stderr | 12 +-- 6 files changed, 109 insertions(+), 40 deletions(-) create mode 100644 tests/ui/auxiliary/proc_macro_attr.rs diff --git a/clippy_lints/Cargo.toml b/clippy_lints/Cargo.toml index 1c0be7278..043a79f20 100644 --- a/clippy_lints/Cargo.toml +++ b/clippy_lints/Cargo.toml @@ -33,5 +33,9 @@ semver = "0.9.0" # see url = { version = "2.1.0", features = ["serde"] } +[dev-dependencies] +quote = "*" +syn = { version = "*", features = ["full"] } + [features] deny-warnings = [] diff --git a/clippy_lints/src/attrs.rs b/clippy_lints/src/attrs.rs index 64abc9fdc..41f125d48 100644 --- a/clippy_lints/src/attrs.rs +++ b/clippy_lints/src/attrs.rs @@ -248,7 +248,6 @@ declare_lint_pass!(Attributes => [ INLINE_ALWAYS, DEPRECATED_SEMVER, USELESS_ATTRIBUTE, - EMPTY_LINE_AFTER_OUTER_ATTR, UNKNOWN_CLIPPY_LINTS, ]); @@ -480,36 +479,6 @@ fn check_attrs(cx: &LateContext<'_, '_>, span: Span, name: Name, attrs: &[Attrib } for attr in attrs { - let attr_item = if let AttrKind::Normal(ref attr) = attr.kind { - attr - } else { - continue; - }; - - if attr.style == AttrStyle::Outer { - if attr_item.args.inner_tokens().is_empty() || !is_present_in_source(cx, attr.span) { - return; - } - - let begin_of_attr_to_item = Span::new(attr.span.lo(), span.lo(), span.ctxt()); - let end_of_attr_to_item = Span::new(attr.span.hi(), span.lo(), span.ctxt()); - - if let Some(snippet) = snippet_opt(cx, end_of_attr_to_item) { - let lines = snippet.split('\n').collect::>(); - let lines = without_block_comments(lines); - - if lines.iter().filter(|l| l.trim().is_empty()).count() > 2 { - span_lint( - cx, - EMPTY_LINE_AFTER_OUTER_ATTR, - begin_of_attr_to_item, - "Found an empty line after an outer attribute. \ - Perhaps you forgot to add a `!` to make it an inner attribute?", - ); - } - } - } - if let Some(values) = attr.meta_item_list() { if values.len() != 1 || !attr.check_name(sym!(inline)) { continue; @@ -551,15 +520,57 @@ fn is_word(nmi: &NestedMetaItem, expected: Symbol) -> bool { } } -declare_lint_pass!(EarlyAttributes => [DEPRECATED_CFG_ATTR, MISMATCHED_TARGET_OS]); +declare_lint_pass!(EarlyAttributes => [ + DEPRECATED_CFG_ATTR, + MISMATCHED_TARGET_OS, + EMPTY_LINE_AFTER_OUTER_ATTR, +]); impl EarlyLintPass for EarlyAttributes { + fn check_item(&mut self, cx: &EarlyContext<'_>, item: &rustc_ast::ast::Item) { + check_empty_line_after_outer_attr(cx, item); + } + fn check_attribute(&mut self, cx: &EarlyContext<'_>, attr: &Attribute) { check_deprecated_cfg_attr(cx, attr); check_mismatched_target_os(cx, attr); } } +fn check_empty_line_after_outer_attr(cx: &EarlyContext<'_>, item: &rustc_ast::ast::Item) { + for attr in &item.attrs { + let attr_item = if let AttrKind::Normal(ref attr) = attr.kind { + attr + } else { + return; + }; + + if attr.style == AttrStyle::Outer { + if attr_item.args.inner_tokens().is_empty() || !is_present_in_source(cx, attr.span) { + return; + } + + let begin_of_attr_to_item = Span::new(attr.span.lo(), item.span.lo(), item.span.ctxt()); + let end_of_attr_to_item = Span::new(attr.span.hi(), item.span.lo(), item.span.ctxt()); + + if let Some(snippet) = snippet_opt(cx, end_of_attr_to_item) { + let lines = snippet.split('\n').collect::>(); + let lines = without_block_comments(lines); + + if lines.iter().filter(|l| l.trim().is_empty()).count() > 2 { + span_lint( + cx, + EMPTY_LINE_AFTER_OUTER_ATTR, + begin_of_attr_to_item, + "Found an empty line after an outer attribute. \ + Perhaps you forgot to add a `!` to make it an inner attribute?", + ); + } + } + } + } +} + fn check_deprecated_cfg_attr(cx: &EarlyContext<'_>, attr: &Attribute) { if_chain! { // check cfg_attr diff --git a/tests/compile-test.rs b/tests/compile-test.rs index a5de84293..2758b9a7e 100644 --- a/tests/compile-test.rs +++ b/tests/compile-test.rs @@ -38,7 +38,7 @@ fn clippy_driver_path() -> PathBuf { // as what we manually pass to `cargo` invocation fn third_party_crates() -> String { use std::collections::HashMap; - static CRATES: &[&str] = &["serde", "serde_derive", "regex", "clippy_lints"]; + static CRATES: &[&str] = &["serde", "serde_derive", "regex", "clippy_lints", "syn", "quote"]; let dep_dir = cargo::TARGET_LIB.join("deps"); let mut crates: HashMap<&str, PathBuf> = HashMap::with_capacity(CRATES.len()); for entry in fs::read_dir(dep_dir).unwrap() { diff --git a/tests/ui/auxiliary/proc_macro_attr.rs b/tests/ui/auxiliary/proc_macro_attr.rs new file mode 100644 index 000000000..e6626d57a --- /dev/null +++ b/tests/ui/auxiliary/proc_macro_attr.rs @@ -0,0 +1,37 @@ +// no-prefer-dynamic + +#![crate_type = "proc-macro"] +#![feature(repr128, proc_macro_hygiene, proc_macro_quote)] +#![allow(clippy::useless_conversion)] + +extern crate proc_macro; +extern crate quote; +extern crate syn; + +use proc_macro::TokenStream; +use quote::{quote, quote_spanned}; +use syn::parse_macro_input; +use syn::{parse_quote, ItemTrait, TraitItem}; + +#[proc_macro_attribute] +pub fn fake_async_trait(_args: TokenStream, input: TokenStream) -> TokenStream { + let mut item = parse_macro_input!(input as ItemTrait); + for inner in &mut item.items { + if let TraitItem::Method(method) = inner { + let sig = &method.sig; + let block = &mut method.default; + if let Some(block) = block { + let brace = block.brace_token; + + let my_block = quote_spanned!( brace.span => { + // Should not trigger `empty_line_after_outer_attr` + #[crate_type = "lib"] + #sig #block + Vec::new() + }); + *block = parse_quote!(#my_block); + } + } + } + TokenStream::from(quote!(#item)) +} diff --git a/tests/ui/empty_line_after_outer_attribute.rs b/tests/ui/empty_line_after_outer_attribute.rs index 5343dff9d..3e92bca98 100644 --- a/tests/ui/empty_line_after_outer_attribute.rs +++ b/tests/ui/empty_line_after_outer_attribute.rs @@ -1,8 +1,12 @@ +// aux-build:proc_macro_attr.rs #![warn(clippy::empty_line_after_outer_attr)] #![allow(clippy::assertions_on_constants)] #![feature(custom_inner_attributes)] #![rustfmt::skip] +#[macro_use] +extern crate proc_macro_attr; + // This should produce a warning #[crate_type = "lib"] @@ -93,4 +97,17 @@ pub struct S; /* test */ pub struct T; -fn main() { } +// This should not produce a warning +// See https://github.com/rust-lang/rust-clippy/issues/5567 +#[fake_async_trait] +pub trait Bazz { + fn foo() -> Vec { + let _i = ""; + + + + vec![] + } +} + +fn main() {} diff --git a/tests/ui/empty_line_after_outer_attribute.stderr b/tests/ui/empty_line_after_outer_attribute.stderr index d8c978654..bf753a732 100644 --- a/tests/ui/empty_line_after_outer_attribute.stderr +++ b/tests/ui/empty_line_after_outer_attribute.stderr @@ -1,5 +1,5 @@ error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? - --> $DIR/empty_line_after_outer_attribute.rs:7:1 + --> $DIR/empty_line_after_outer_attribute.rs:11:1 | LL | / #[crate_type = "lib"] LL | | @@ -10,7 +10,7 @@ LL | | fn with_one_newline_and_comment() { assert!(true) } = note: `-D clippy::empty-line-after-outer-attr` implied by `-D warnings` error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? - --> $DIR/empty_line_after_outer_attribute.rs:19:1 + --> $DIR/empty_line_after_outer_attribute.rs:23:1 | LL | / #[crate_type = "lib"] LL | | @@ -18,7 +18,7 @@ LL | | fn with_one_newline() { assert!(true) } | |_ error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? - --> $DIR/empty_line_after_outer_attribute.rs:24:1 + --> $DIR/empty_line_after_outer_attribute.rs:28:1 | LL | / #[crate_type = "lib"] LL | | @@ -27,7 +27,7 @@ LL | | fn with_two_newlines() { assert!(true) } | |_ error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? - --> $DIR/empty_line_after_outer_attribute.rs:31:1 + --> $DIR/empty_line_after_outer_attribute.rs:35:1 | LL | / #[crate_type = "lib"] LL | | @@ -35,7 +35,7 @@ LL | | enum Baz { | |_ error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? - --> $DIR/empty_line_after_outer_attribute.rs:39:1 + --> $DIR/empty_line_after_outer_attribute.rs:43:1 | LL | / #[crate_type = "lib"] LL | | @@ -43,7 +43,7 @@ LL | | struct Foo { | |_ error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? - --> $DIR/empty_line_after_outer_attribute.rs:47:1 + --> $DIR/empty_line_after_outer_attribute.rs:51:1 | LL | / #[crate_type = "lib"] LL | | From e3f6a8fc20ce778168e079257b7a33a47fe8541f Mon Sep 17 00:00:00 2001 From: Philipp Hansch Date: Sun, 17 May 2020 19:09:07 +0200 Subject: [PATCH 0116/4780] Specify quote and syn versions --- clippy_lints/Cargo.toml | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/clippy_lints/Cargo.toml b/clippy_lints/Cargo.toml index 043a79f20..11586083d 100644 --- a/clippy_lints/Cargo.toml +++ b/clippy_lints/Cargo.toml @@ -34,8 +34,8 @@ semver = "0.9.0" url = { version = "2.1.0", features = ["serde"] } [dev-dependencies] -quote = "*" -syn = { version = "*", features = ["full"] } +quote = "1.0.2" +syn = { version = "1.0.11", features = ["full"] } [features] deny-warnings = [] From cdff59e156a85d86f7abb9834e42a18fe1ee257e Mon Sep 17 00:00:00 2001 From: Philipp Hansch Date: Sun, 17 May 2020 19:13:33 +0200 Subject: [PATCH 0117/4780] Using dev-dependencies doesn't seem to work w/ compiletest --- clippy_lints/Cargo.toml | 2 -- 1 file changed, 2 deletions(-) diff --git a/clippy_lints/Cargo.toml b/clippy_lints/Cargo.toml index 11586083d..7514608bc 100644 --- a/clippy_lints/Cargo.toml +++ b/clippy_lints/Cargo.toml @@ -32,8 +32,6 @@ semver = "0.9.0" # NOTE: cargo requires serde feat in its url dep # see url = { version = "2.1.0", features = ["serde"] } - -[dev-dependencies] quote = "1.0.2" syn = { version = "1.0.11", features = ["full"] } From fd86b3150e21df8eb6fee2f0c8b69f323146ffad Mon Sep 17 00:00:00 2001 From: Philipp Hansch Date: Tue, 26 May 2020 16:51:04 +0200 Subject: [PATCH 0118/4780] Be less specific about quote and syn versions --- clippy_lints/Cargo.toml | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/clippy_lints/Cargo.toml b/clippy_lints/Cargo.toml index 7514608bc..76baf27fb 100644 --- a/clippy_lints/Cargo.toml +++ b/clippy_lints/Cargo.toml @@ -32,8 +32,8 @@ semver = "0.9.0" # NOTE: cargo requires serde feat in its url dep # see url = { version = "2.1.0", features = ["serde"] } -quote = "1.0.2" -syn = { version = "1.0.11", features = ["full"] } +quote = "1" +syn = { version = "1", features = ["full"] } [features] deny-warnings = [] From 1801841ae554a7778666c4c1085393b32eccf74d Mon Sep 17 00:00:00 2001 From: ThibsG Date: Tue, 26 May 2020 18:40:42 +0200 Subject: [PATCH 0119/4780] Add test cases for broader coverage --- clippy_lints/src/useless_conversion.rs | 10 ++++---- tests/ui/useless_conversion.stderr | 20 ++++++++-------- tests/ui/useless_conversion_try.rs | 8 +++++++ tests/ui/useless_conversion_try.stderr | 32 +++++++++++++++++++------- 4 files changed, 47 insertions(+), 23 deletions(-) diff --git a/clippy_lints/src/useless_conversion.rs b/clippy_lints/src/useless_conversion.rs index 1645c5777..7fa97b246 100644 --- a/clippy_lints/src/useless_conversion.rs +++ b/clippy_lints/src/useless_conversion.rs @@ -71,7 +71,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { cx, USELESS_CONVERSION, e.span, - "Useless conversion to the same type", + "useless conversion to the same type", "consider removing `.into()`", sugg, Applicability::MachineApplicable, // snippet @@ -87,7 +87,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { cx, USELESS_CONVERSION, e.span, - "Useless conversion to the same type", + "useless conversion to the same type", "consider removing `.into_iter()`", sugg, Applicability::MachineApplicable, // snippet @@ -108,7 +108,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { cx, USELESS_CONVERSION, e.span, - "Useless conversion to the same type", + "useless conversion to the same type", None, "consider removing `.try_into()`", ); @@ -139,7 +139,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { cx, USELESS_CONVERSION, e.span, - "Useless conversion to the same type", + "useless conversion to the same type", None, &hint, ); @@ -158,7 +158,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { cx, USELESS_CONVERSION, e.span, - "Useless conversion to the same type", + "useless conversion to the same type", &sugg_msg, sugg, Applicability::MachineApplicable, // snippet diff --git a/tests/ui/useless_conversion.stderr b/tests/ui/useless_conversion.stderr index 0b2947f7d..84ec53702 100644 --- a/tests/ui/useless_conversion.stderr +++ b/tests/ui/useless_conversion.stderr @@ -1,4 +1,4 @@ -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:6:13 | LL | let _ = T::from(val); @@ -10,55 +10,55 @@ note: the lint level is defined here LL | #![deny(clippy::useless_conversion)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:7:5 | LL | val.into() | ^^^^^^^^^^ help: consider removing `.into()`: `val` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:19:22 | LL | let _: i32 = 0i32.into(); | ^^^^^^^^^^^ help: consider removing `.into()`: `0i32` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:51:21 | LL | let _: String = "foo".to_string().into(); | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `"foo".to_string()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:52:21 | LL | let _: String = From::from("foo".to_string()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `From::from()`: `"foo".to_string()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:53:13 | LL | let _ = String::from("foo".to_string()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `"foo".to_string()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:54:13 | LL | let _ = String::from(format!("A: {:04}", 123)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("A: {:04}", 123)` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:55:13 | LL | let _ = "".lines().into_iter(); | ^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `"".lines()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:56:13 | LL | let _ = vec![1, 2, 3].into_iter().into_iter(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `vec![1, 2, 3].into_iter()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion.rs:57:21 | LL | let _: String = format!("Hello {}", "world").into(); diff --git a/tests/ui/useless_conversion_try.rs b/tests/ui/useless_conversion_try.rs index ab4f960ed..3787ea991 100644 --- a/tests/ui/useless_conversion_try.rs +++ b/tests/ui/useless_conversion_try.rs @@ -31,4 +31,12 @@ fn main() { let _ = String::try_from("foo".to_string()).unwrap(); let _ = String::try_from(format!("A: {:04}", 123)).unwrap(); let _: String = format!("Hello {}", "world").try_into().unwrap(); + let _: String = "".to_owned().try_into().unwrap(); + let _: String = match String::from("_").try_into() { + Ok(a) => a, + Err(_) => "".into(), + }; + // FIXME this is a false negative + #[allow(clippy::cmp_owned)] + if String::from("a") == TryInto::::try_into(String::from("a")).unwrap() {} } diff --git a/tests/ui/useless_conversion_try.stderr b/tests/ui/useless_conversion_try.stderr index 5afb5dc45..b765727c1 100644 --- a/tests/ui/useless_conversion_try.stderr +++ b/tests/ui/useless_conversion_try.stderr @@ -1,4 +1,4 @@ -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion_try.rs:6:13 | LL | let _ = T::try_from(val).unwrap(); @@ -11,7 +11,7 @@ LL | #![deny(clippy::useless_conversion)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ = help: consider removing `T::try_from()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion_try.rs:7:5 | LL | val.try_into().unwrap() @@ -19,7 +19,7 @@ LL | val.try_into().unwrap() | = help: consider removing `.try_into()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion_try.rs:29:21 | LL | let _: String = "foo".to_string().try_into().unwrap(); @@ -27,7 +27,7 @@ LL | let _: String = "foo".to_string().try_into().unwrap(); | = help: consider removing `.try_into()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion_try.rs:30:21 | LL | let _: String = TryFrom::try_from("foo".to_string()).unwrap(); @@ -35,7 +35,7 @@ LL | let _: String = TryFrom::try_from("foo".to_string()).unwrap(); | = help: consider removing `TryFrom::try_from()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion_try.rs:31:13 | LL | let _ = String::try_from("foo".to_string()).unwrap(); @@ -43,7 +43,7 @@ LL | let _ = String::try_from("foo".to_string()).unwrap(); | = help: consider removing `String::try_from()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion_try.rs:32:13 | LL | let _ = String::try_from(format!("A: {:04}", 123)).unwrap(); @@ -51,7 +51,7 @@ LL | let _ = String::try_from(format!("A: {:04}", 123)).unwrap(); | = help: consider removing `String::try_from()` -error: Useless conversion to the same type +error: useless conversion to the same type --> $DIR/useless_conversion_try.rs:33:21 | LL | let _: String = format!("Hello {}", "world").try_into().unwrap(); @@ -59,5 +59,21 @@ LL | let _: String = format!("Hello {}", "world").try_into().unwrap(); | = help: consider removing `.try_into()` -error: aborting due to 7 previous errors +error: useless conversion to the same type + --> $DIR/useless_conversion_try.rs:34:21 + | +LL | let _: String = "".to_owned().try_into().unwrap(); + | ^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider removing `.try_into()` + +error: useless conversion to the same type + --> $DIR/useless_conversion_try.rs:35:27 + | +LL | let _: String = match String::from("_").try_into() { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = help: consider removing `.try_into()` + +error: aborting due to 9 previous errors From 7fd3bd0f57e11a65641501d6a898328ecb83ca77 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Fri, 24 Apr 2020 00:14:03 +0200 Subject: [PATCH 0120/4780] Register redundant_field_names and non_expressive_names as early passes --- clippy_lints/src/lib.rs | 12 ++++++------ src/driver.rs | 2 +- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 057d39d4c..902f3d56c 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -346,13 +346,8 @@ mod reexport { /// level (i.e `#![cfg_attr(...)]`) will still be expanded even when using a pre-expansion pass. /// /// Used in `./src/driver.rs`. -pub fn register_pre_expansion_lints(store: &mut rustc_lint::LintStore, conf: &Conf) { +pub fn register_pre_expansion_lints(store: &mut rustc_lint::LintStore) { store.register_pre_expansion_pass(|| box write::Write::default()); - store.register_pre_expansion_pass(|| box redundant_field_names::RedundantFieldNames); - let single_char_binding_names_threshold = conf.single_char_binding_names_threshold; - store.register_pre_expansion_pass(move || box non_expressive_names::NonExpressiveNames { - single_char_binding_names_threshold, - }); store.register_pre_expansion_pass(|| box attrs::EarlyAttributes); store.register_pre_expansion_pass(|| box dbg_macro::DbgMacro); } @@ -1066,6 +1061,11 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box match_on_vec_items::MatchOnVecItems); store.register_early_pass(|| box manual_non_exhaustive::ManualNonExhaustive); store.register_late_pass(|| box manual_async_fn::ManualAsyncFn); + store.register_early_pass(|| box redundant_field_names::RedundantFieldNames); + let single_char_binding_names_threshold = conf.single_char_binding_names_threshold; + store.register_early_pass(move || box non_expressive_names::NonExpressiveNames { + single_char_binding_names_threshold, + }); store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![ LintId::of(&arithmetic::FLOAT_ARITHMETIC), diff --git a/src/driver.rs b/src/driver.rs index d3a7e2493..70c47b426 100644 --- a/src/driver.rs +++ b/src/driver.rs @@ -79,7 +79,7 @@ impl rustc_driver::Callbacks for ClippyCallbacks { let conf = clippy_lints::read_conf(&[], &sess); clippy_lints::register_plugins(&mut lint_store, &sess, &conf); - clippy_lints::register_pre_expansion_lints(&mut lint_store, &conf); + clippy_lints::register_pre_expansion_lints(&mut lint_store); clippy_lints::register_renamed(&mut lint_store); })); From 8e22d15055231fc0df4a07d57cd883fd89d8131b Mon Sep 17 00:00:00 2001 From: flip1995 Date: Tue, 12 May 2020 16:26:55 +0200 Subject: [PATCH 0121/4780] Fix fallout in redundant_field_names --- clippy_lints/src/redundant_field_names.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/clippy_lints/src/redundant_field_names.rs b/clippy_lints/src/redundant_field_names.rs index b12c3c344..2a81170e4 100644 --- a/clippy_lints/src/redundant_field_names.rs +++ b/clippy_lints/src/redundant_field_names.rs @@ -2,6 +2,7 @@ use crate::utils::span_lint_and_sugg; use rustc_ast::ast::{Expr, ExprKind}; use rustc_errors::Applicability; use rustc_lint::{EarlyContext, EarlyLintPass}; +use rustc_middle::lint::in_external_macro; use rustc_session::{declare_lint_pass, declare_tool_lint}; declare_clippy_lint! { @@ -36,6 +37,9 @@ declare_lint_pass!(RedundantFieldNames => [REDUNDANT_FIELD_NAMES]); impl EarlyLintPass for RedundantFieldNames { fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) { + if in_external_macro(cx.sess, expr.span) { + return; + } if let ExprKind::Struct(_, ref fields, _) = expr.kind { for field in fields { if field.is_shorthand { From 04db13eb564f6e3264a0d376ef95365b1de44797 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Tue, 12 May 2020 16:50:00 +0200 Subject: [PATCH 0122/4780] Fix fallout in similar_names --- clippy_lints/src/non_expressive_names.rs | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/clippy_lints/src/non_expressive_names.rs b/clippy_lints/src/non_expressive_names.rs index 2b51b7320..5328773a7 100644 --- a/clippy_lints/src/non_expressive_names.rs +++ b/clippy_lints/src/non_expressive_names.rs @@ -5,6 +5,7 @@ use rustc_ast::ast::{ use rustc_ast::attr; use rustc_ast::visit::{walk_block, walk_expr, walk_pat, Visitor}; use rustc_lint::{EarlyContext, EarlyLintPass}; +use rustc_middle::lint::in_external_macro; use rustc_session::{declare_tool_lint, impl_lint_pass}; use rustc_span::source_map::Span; use rustc_span::symbol::{Ident, SymbolStr}; @@ -354,12 +355,20 @@ impl<'a, 'tcx> Visitor<'tcx> for SimilarNamesLocalVisitor<'a, 'tcx> { impl EarlyLintPass for NonExpressiveNames { fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) { + if in_external_macro(cx.sess, item.span) { + return; + } + if let ItemKind::Fn(_, ref sig, _, Some(ref blk)) = item.kind { do_check(self, cx, &item.attrs, &sig.decl, blk); } } fn check_impl_item(&mut self, cx: &EarlyContext<'_>, item: &AssocItem) { + if in_external_macro(cx.sess, item.span) { + return; + } + if let AssocItemKind::Fn(_, ref sig, _, Some(ref blk)) = item.kind { do_check(self, cx, &item.attrs, &sig.decl, blk); } From 0ad08109fd1c0b72d8bde3291271e4f2c8dbe66e Mon Sep 17 00:00:00 2001 From: Sora Morimoto Date: Wed, 27 May 2020 06:25:38 +0900 Subject: [PATCH 0123/4780] Bump actions/cache from v1 to v2 --- .github/workflows/clippy.yml | 2 +- .github/workflows/clippy_bors.yml | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/.github/workflows/clippy.yml b/.github/workflows/clippy.yml index 8edf0c238..5fa8009a8 100644 --- a/.github/workflows/clippy.yml +++ b/.github/workflows/clippy.yml @@ -49,7 +49,7 @@ jobs: run: cargo update - name: Cache cargo dir - uses: actions/cache@v1 + uses: actions/cache@v2 with: path: ~/.cargo key: ${{ runner.os }}-x86_64-unknown-linux-gnu-${{ hashFiles('Cargo.lock') }} diff --git a/.github/workflows/clippy_bors.yml b/.github/workflows/clippy_bors.yml index 6675a1029..a8a673343 100644 --- a/.github/workflows/clippy_bors.yml +++ b/.github/workflows/clippy_bors.yml @@ -94,7 +94,7 @@ jobs: run: cargo update - name: Cache cargo dir - uses: actions/cache@v1 + uses: actions/cache@v2 with: path: ~/.cargo key: ${{ runner.os }}-${{ matrix.host }}-${{ hashFiles('Cargo.lock') }} @@ -190,7 +190,7 @@ jobs: run: cargo update - name: Cache cargo dir - uses: actions/cache@v1 + uses: actions/cache@v2 with: path: ~/.cargo key: ${{ runner.os }}-x86_64-unknown-linux-gnu-${{ hashFiles('Cargo.lock') }} @@ -269,7 +269,7 @@ jobs: run: cargo update - name: Cache cargo dir - uses: actions/cache@v1 + uses: actions/cache@v2 with: path: ~/.cargo key: ${{ runner.os }}-x86_64-unknown-linux-gnu-${{ hashFiles('Cargo.lock') }} From 416182347589e9503408136747593ff95fb9dd13 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Wed, 27 May 2020 00:06:50 +0200 Subject: [PATCH 0124/4780] Avoid triggering similar names on code from expansion --- clippy_lints/src/new_without_default.rs | 10 +++++----- clippy_lints/src/non_expressive_names.rs | 6 +++++- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/clippy_lints/src/new_without_default.rs b/clippy_lints/src/new_without_default.rs index 3b88e4c4c..e556e5d59 100644 --- a/clippy_lints/src/new_without_default.rs +++ b/clippy_lints/src/new_without_default.rs @@ -90,8 +90,8 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NewWithoutDefault { return; } if sig.decl.inputs.is_empty() && name == sym!(new) && cx.access_levels.is_reachable(id) { - let self_did = cx.tcx.hir().local_def_id(cx.tcx.hir().get_parent_item(id)); - let self_ty = cx.tcx.type_of(self_did); + let self_def_id = cx.tcx.hir().local_def_id(cx.tcx.hir().get_parent_item(id)); + let self_ty = cx.tcx.type_of(self_def_id); if_chain! { if same_tys(cx, self_ty, return_ty(cx, id)); if let Some(default_trait_id) = get_trait_def_id(cx, &paths::DEFAULT_TRAIT); @@ -112,10 +112,10 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NewWithoutDefault { // generics if_chain! { if let Some(ref impling_types) = self.impling_types; - if let Some(self_def) = cx.tcx.type_of(self_did).ty_adt_def(); - if let Some(self_def_id) = self_def.did.as_local(); + if let Some(self_def) = cx.tcx.type_of(self_def_id).ty_adt_def(); + if let Some(self_local_did) = self_def.did.as_local(); then { - let self_id = cx.tcx.hir().local_def_id_to_hir_id(self_def_id); + let self_id = cx.tcx.hir().local_def_id_to_hir_id(self_local_did); if impling_types.contains(&self_id) { return; } diff --git a/clippy_lints/src/non_expressive_names.rs b/clippy_lints/src/non_expressive_names.rs index 5328773a7..5f14fe97a 100644 --- a/clippy_lints/src/non_expressive_names.rs +++ b/clippy_lints/src/non_expressive_names.rs @@ -132,7 +132,11 @@ struct SimilarNamesNameVisitor<'a, 'tcx, 'b>(&'b mut SimilarNamesLocalVisitor<'a impl<'a, 'tcx, 'b> Visitor<'tcx> for SimilarNamesNameVisitor<'a, 'tcx, 'b> { fn visit_pat(&mut self, pat: &'tcx Pat) { match pat.kind { - PatKind::Ident(_, ident, _) => self.check_ident(ident), + PatKind::Ident(_, ident, _) => { + if !pat.span.from_expansion() { + self.check_ident(ident); + } + }, PatKind::Struct(_, ref fields, _) => { for field in fields { if !field.is_shorthand { From 58429c74a31fabde8555f940530039bdadde8400 Mon Sep 17 00:00:00 2001 From: Philipp Krones Date: Wed, 27 May 2020 00:51:08 +0200 Subject: [PATCH 0125/4780] Fail bors on missing changelog --- .github/workflows/clippy_bors.yml | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/.github/workflows/clippy_bors.yml b/.github/workflows/clippy_bors.yml index 6675a1029..eb8da9dcc 100644 --- a/.github/workflows/clippy_bors.yml +++ b/.github/workflows/clippy_bors.yml @@ -312,7 +312,7 @@ jobs: name: bors test finished if: github.event.pusher.name == 'bors' && success() runs-on: ubuntu-latest - needs: [base, integration] + needs: [changelog, base, integration_build, integration] steps: - name: Mark the job as successful @@ -322,7 +322,7 @@ jobs: name: bors test finished if: github.event.pusher.name == 'bors' && (failure() || cancelled()) runs-on: ubuntu-latest - needs: [base, integration] + needs: [changelog, base, integration_build, integration] steps: - name: Mark the job as a failure From 3089c3b3077fa8ae0b6f68c5f56650bf726e3298 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= Date: Wed, 27 May 2020 13:55:57 +0200 Subject: [PATCH 0126/4780] rustup https://github.com/rust-lang/rust/pull/72342, allow unused_crate_dependencies --- tests/ui/cognitive_complexity.rs | 2 +- tests/ui/cognitive_complexity_attr_used.rs | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tests/ui/cognitive_complexity.rs b/tests/ui/cognitive_complexity.rs index 1d3fe4055..912e6788a 100644 --- a/tests/ui/cognitive_complexity.rs +++ b/tests/ui/cognitive_complexity.rs @@ -1,6 +1,6 @@ #![allow(clippy::all)] #![warn(clippy::cognitive_complexity)] -#![allow(unused)] +#![allow(unused, unused_crate_dependencies)] #[rustfmt::skip] fn main() { diff --git a/tests/ui/cognitive_complexity_attr_used.rs b/tests/ui/cognitive_complexity_attr_used.rs index 403eff566..771a26fc9 100644 --- a/tests/ui/cognitive_complexity_attr_used.rs +++ b/tests/ui/cognitive_complexity_attr_used.rs @@ -1,5 +1,5 @@ -#![warn(clippy::cognitive_complexity)] -#![warn(unused)] +#![warn(unused, clippy::cognitive_complexity)] +#![allow(unused_crate_dependencies)] fn main() { kaboom(); From 64a05f56c33d4754808ef85e634f72a9053c56fd Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Thu, 28 May 2020 00:36:15 +0200 Subject: [PATCH 0127/4780] len_zero: skip ranges if feature `range_is_empty` is not enabled --- clippy_lints/src/len_zero.rs | 17 ++++++++++++++++- tests/ui/len_zero.fixed | 8 ++++++++ tests/ui/len_zero.rs | 8 ++++++++ tests/ui/len_zero_ranges.fixed | 14 ++++++++++++++ tests/ui/len_zero_ranges.rs | 14 ++++++++++++++ tests/ui/len_zero_ranges.stderr | 10 ++++++++++ 6 files changed, 70 insertions(+), 1 deletion(-) create mode 100644 tests/ui/len_zero_ranges.fixed create mode 100644 tests/ui/len_zero_ranges.rs create mode 100644 tests/ui/len_zero_ranges.stderr diff --git a/clippy_lints/src/len_zero.rs b/clippy_lints/src/len_zero.rs index 2ec0b5a8d..f5bfede75 100644 --- a/clippy_lints/src/len_zero.rs +++ b/clippy_lints/src/len_zero.rs @@ -1,4 +1,4 @@ -use crate::utils::{get_item_name, snippet_with_applicability, span_lint, span_lint_and_sugg, walk_ptrs_ty}; +use crate::utils::{get_item_name, higher, snippet_with_applicability, span_lint, span_lint_and_sugg, walk_ptrs_ty}; use rustc_ast::ast::LitKind; use rustc_data_structures::fx::FxHashSet; use rustc_errors::Applicability; @@ -259,6 +259,17 @@ fn check_len( /// Checks if this type has an `is_empty` method. fn has_is_empty(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { + /// Special case ranges until `range_is_empty` is stabilized. See issue 3807. + fn should_skip_range(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { + higher::range(cx, expr).map_or(false, |_| { + !cx.tcx + .features() + .declared_lib_features + .iter() + .any(|(name, _)| name.as_str() == "range_is_empty") + }) + } + /// Gets an `AssocItem` and return true if it matches `is_empty(self)`. fn is_is_empty(cx: &LateContext<'_, '_>, item: &ty::AssocItem) -> bool { if let ty::AssocKind::Fn = item.kind { @@ -284,6 +295,10 @@ fn has_is_empty(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { }) } + if should_skip_range(cx, expr) { + return false; + } + let ty = &walk_ptrs_ty(cx.tables.expr_ty(expr)); match ty.kind { ty::Dynamic(ref tt, ..) => { diff --git a/tests/ui/len_zero.fixed b/tests/ui/len_zero.fixed index 624e5ef8f..a29b832eb 100644 --- a/tests/ui/len_zero.fixed +++ b/tests/ui/len_zero.fixed @@ -141,3 +141,11 @@ fn main() { fn test_slice(b: &[u8]) { if !b.is_empty() {} } + +mod issue_3807 { + // Avoid suggesting changes to ranges if the user did not enable `range_is_empty`. + // See https://github.com/rust-lang/rust/issues/48111#issuecomment-445132965 + fn no_suggestion() { + let _ = (0..42).len() == 0; + } +} diff --git a/tests/ui/len_zero.rs b/tests/ui/len_zero.rs index 7fba971cf..8fd0093f4 100644 --- a/tests/ui/len_zero.rs +++ b/tests/ui/len_zero.rs @@ -141,3 +141,11 @@ fn main() { fn test_slice(b: &[u8]) { if b.len() != 0 {} } + +mod issue_3807 { + // Avoid suggesting changes to ranges if the user did not enable `range_is_empty`. + // See https://github.com/rust-lang/rust/issues/48111#issuecomment-445132965 + fn no_suggestion() { + let _ = (0..42).len() == 0; + } +} diff --git a/tests/ui/len_zero_ranges.fixed b/tests/ui/len_zero_ranges.fixed new file mode 100644 index 000000000..7da26f8ff --- /dev/null +++ b/tests/ui/len_zero_ranges.fixed @@ -0,0 +1,14 @@ +// run-rustfix + +#![feature(range_is_empty)] +#![warn(clippy::len_zero)] +#![allow(unused)] + +mod issue_3807 { + // With the feature enabled, `is_empty` should be suggested + fn suggestion_is_fine() { + let _ = (0..42).is_empty(); + } +} + +fn main() {} diff --git a/tests/ui/len_zero_ranges.rs b/tests/ui/len_zero_ranges.rs new file mode 100644 index 000000000..be7b4244b --- /dev/null +++ b/tests/ui/len_zero_ranges.rs @@ -0,0 +1,14 @@ +// run-rustfix + +#![feature(range_is_empty)] +#![warn(clippy::len_zero)] +#![allow(unused)] + +mod issue_3807 { + // With the feature enabled, `is_empty` should be suggested + fn suggestion_is_fine() { + let _ = (0..42).len() == 0; + } +} + +fn main() {} diff --git a/tests/ui/len_zero_ranges.stderr b/tests/ui/len_zero_ranges.stderr new file mode 100644 index 000000000..6e5fa41fb --- /dev/null +++ b/tests/ui/len_zero_ranges.stderr @@ -0,0 +1,10 @@ +error: length comparison to zero + --> $DIR/len_zero_ranges.rs:10:17 + | +LL | let _ = (0..42).len() == 0; + | ^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `(0..42).is_empty()` + | + = note: `-D clippy::len-zero` implied by `-D warnings` + +error: aborting due to previous error + From 7b490903809ce5c03c83869357a68e88f8cc0799 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= Date: Wed, 27 May 2020 14:08:31 +0200 Subject: [PATCH 0128/4780] clippy_dev: add ra_setup This takes an absolute path to a rustc repo and adds path-dependencies that point towards the respective rustc subcrates into the Cargo.tomls of the clippy and clippy_lints crate. This allows rustc-analyzer to show proper type annotations etc on rustc-internals inside the clippy repo. Usage: cargo dev ra-setup /absolute/path/to/rust/ cc https://github.com/rust-analyzer/rust-analyzer/issues/3517 cc https://github.com/rust-lang/rust-clippy/issues/5514 --- clippy_dev/src/lib.rs | 3 +- clippy_dev/src/main.rs | 16 ++++++- clippy_dev/src/ra_setup.rs | 90 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 107 insertions(+), 2 deletions(-) create mode 100644 clippy_dev/src/ra_setup.rs diff --git a/clippy_dev/src/lib.rs b/clippy_dev/src/lib.rs index 6fdd282c6..5baa31d5c 100644 --- a/clippy_dev/src/lib.rs +++ b/clippy_dev/src/lib.rs @@ -11,6 +11,7 @@ use walkdir::WalkDir; pub mod fmt; pub mod new_lint; +pub mod ra_setup; pub mod stderr_length_check; pub mod update_lints; @@ -400,7 +401,7 @@ fn test_replace_region_no_changes() { changed: false, new_lines: "123\n456\n789".to_string(), }; - let result = replace_region_in_text(text, r#"^\s*123$"#, r#"^\s*456"#, false, || vec![]); + let result = replace_region_in_text(text, r#"^\s*123$"#, r#"^\s*456"#, false, Vec::new); assert_eq!(expected, result); } diff --git a/clippy_dev/src/main.rs b/clippy_dev/src/main.rs index d99235f7c..281037ae3 100644 --- a/clippy_dev/src/main.rs +++ b/clippy_dev/src/main.rs @@ -1,7 +1,7 @@ #![cfg_attr(feature = "deny-warnings", deny(warnings))] use clap::{App, Arg, SubCommand}; -use clippy_dev::{fmt, new_lint, stderr_length_check, update_lints}; +use clippy_dev::{fmt, new_lint, ra_setup, stderr_length_check, update_lints}; fn main() { let matches = App::new("Clippy developer tooling") @@ -87,6 +87,19 @@ fn main() { SubCommand::with_name("limit_stderr_length") .about("Ensures that stderr files do not grow longer than a certain amount of lines."), ) + .subcommand( + SubCommand::with_name("ra-setup") + .about("Alter dependencies so rust-analyzer can find rustc internals") + .arg( + Arg::with_name("rustc-repo-path") + .long("repo-path") + .short("r") + .help("The path to a rustc repo that will be used for setting the dependencies") + .takes_value(true) + .value_name("path") + .required(true), + ), + ) .get_matches(); match matches.subcommand() { @@ -115,6 +128,7 @@ fn main() { ("limit_stderr_length", _) => { stderr_length_check::check(); }, + ("ra-setup", Some(matches)) => ra_setup::run(matches.value_of("rustc-repo-path")), _ => {}, } } diff --git a/clippy_dev/src/ra_setup.rs b/clippy_dev/src/ra_setup.rs new file mode 100644 index 000000000..8617445c8 --- /dev/null +++ b/clippy_dev/src/ra_setup.rs @@ -0,0 +1,90 @@ +#![allow(clippy::filter_map)] + +use std::fs; +use std::fs::File; +use std::io::prelude::*; +use std::path::PathBuf; + +// This module takes an absolute path to a rustc repo and alters the dependencies to point towards +// the respective rustc subcrates instead of using extern crate xyz. +// This allows rust analyzer to analyze rustc internals and show proper information inside clippy +// code. See https://github.com/rust-analyzer/rust-analyzer/issues/3517 and https://github.com/rust-lang/rust-clippy/issues/5514 for details + +pub fn run(rustc_path: Option<&str>) { + // we can unwrap here because the arg is required here + let rustc_path = PathBuf::from(rustc_path.unwrap()); + assert!(rustc_path.is_dir(), "path is not a directory"); + let rustc_source_basedir = rustc_path.join("src"); + assert!( + rustc_source_basedir.is_dir(), + "are you sure the path leads to a rustc repo?" + ); + + let clippy_root_manifest = fs::read_to_string("Cargo.toml").expect("failed to read ./Cargo.toml"); + let clippy_root_lib_rs = fs::read_to_string("src/driver.rs").expect("failed to read ./src/driver.rs"); + inject_deps_into_manifest( + &rustc_source_basedir, + "Cargo.toml", + &clippy_root_manifest, + &clippy_root_lib_rs, + ) + .expect("Failed to inject deps into ./Cargo.toml"); + + let clippy_lints_manifest = + fs::read_to_string("clippy_lints/Cargo.toml").expect("failed to read ./clippy_lints/Cargo.toml"); + let clippy_lints_lib_rs = + fs::read_to_string("clippy_lints/src/lib.rs").expect("failed to read ./clippy_lints/src/lib.rs"); + inject_deps_into_manifest( + &rustc_source_basedir, + "clippy_lints/Cargo.toml", + &clippy_lints_manifest, + &clippy_lints_lib_rs, + ) + .expect("Failed to inject deps into ./clippy_lints/Cargo.toml"); +} + +fn inject_deps_into_manifest( + rustc_source_dir: &PathBuf, + manifest_path: &str, + cargo_toml: &str, + lib_rs: &str, +) -> std::io::Result<()> { + let extern_crates = lib_rs + .lines() + // get the deps + .filter(|line| line.starts_with("extern crate")) + // we have something like "extern crate foo;", we only care about the "foo" + // ↓ ↓ + // extern crate rustc_middle; + .map(|s| &s[13..(s.len() - 1)]); + + let new_deps = extern_crates.map(|dep| { + // format the dependencies that are going to be put inside the Cargo.toml + format!( + "{dep} = {{ path = \"{source_path}/lib{dep}\" }}\n", + dep = dep, + source_path = rustc_source_dir.display() + ) + }); + + // format a new [dependencies]-block with the new deps we need to inject + let mut all_deps = String::from("[dependencies]\n"); + new_deps.for_each(|dep_line| { + all_deps.push_str(&dep_line); + }); + + // replace "[dependencies]" with + // [dependencies] + // dep1 = { path = ... } + // dep2 = { path = ... } + // etc + let new_manifest = cargo_toml.replacen("[dependencies]\n", &all_deps, 1); + + // println!("{}", new_manifest); + let mut file = File::create(manifest_path)?; + file.write_all(new_manifest.as_bytes())?; + + println!("Dependency paths injected: {}", manifest_path); + + Ok(()) +} From b92cc8a08d74fb412bc444a4361df51b0c95401c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= Date: Fri, 29 May 2020 22:46:05 +0200 Subject: [PATCH 0129/4780] add testcase that no longer ICEs Fixes #3969 --- tests/ui/crashes/ice-3969.rs | 51 ++++++++++++++++++++++++++++++++ tests/ui/crashes/ice-3969.stderr | 22 ++++++++++++++ 2 files changed, 73 insertions(+) create mode 100644 tests/ui/crashes/ice-3969.rs create mode 100644 tests/ui/crashes/ice-3969.stderr diff --git a/tests/ui/crashes/ice-3969.rs b/tests/ui/crashes/ice-3969.rs new file mode 100644 index 000000000..4feab7910 --- /dev/null +++ b/tests/ui/crashes/ice-3969.rs @@ -0,0 +1,51 @@ +// https://github.com/rust-lang/rust-clippy/issues/3969 +// used to crash: error: internal compiler error: +// src/librustc_traits/normalize_erasing_regions.rs:43: could not fully normalize `::Item test from rustc ./ui/trivial-bounds/trivial-bounds-inconsistent.rs + +// Check that tautalogically false bounds are accepted, and are used +// in type inference. +#![feature(trivial_bounds)] +#![allow(unused)] + +trait A {} + +impl A for i32 {} + +struct Dst { + x: X, +} + +struct TwoStrs(str, str) +where + str: Sized; + +fn unsized_local() +where + for<'a> Dst: Sized, +{ + let x: Dst = *(Box::new(Dst { x: 1 }) as Box>); +} + +fn return_str() -> str +where + str: Sized, +{ + *"Sized".to_string().into_boxed_str() +} + +fn use_op(s: String) -> String +where + String: ::std::ops::Neg, +{ + -s +} + +fn use_for() +where + i32: Iterator, +{ + for _ in 2i32 {} +} + +fn main() {} diff --git a/tests/ui/crashes/ice-3969.stderr b/tests/ui/crashes/ice-3969.stderr new file mode 100644 index 000000000..923db0664 --- /dev/null +++ b/tests/ui/crashes/ice-3969.stderr @@ -0,0 +1,22 @@ +error: trait objects without an explicit `dyn` are deprecated + --> $DIR/ice-3969.rs:25:17 + | +LL | for<'a> Dst: Sized, + | ^^^^^^ help: use `dyn`: `dyn A + 'a` + | + = note: `-D bare-trait-objects` implied by `-D warnings` + +error: trait objects without an explicit `dyn` are deprecated + --> $DIR/ice-3969.rs:27:16 + | +LL | let x: Dst = *(Box::new(Dst { x: 1 }) as Box>); + | ^ help: use `dyn`: `dyn A` + +error: trait objects without an explicit `dyn` are deprecated + --> $DIR/ice-3969.rs:27:57 + | +LL | let x: Dst = *(Box::new(Dst { x: 1 }) as Box>); + | ^ help: use `dyn`: `dyn A` + +error: aborting due to 3 previous errors + From 5faab874f9f8655c8f284944b5acdede5c088af4 Mon Sep 17 00:00:00 2001 From: Tim Nielens Date: Sat, 23 May 2020 00:07:09 +0200 Subject: [PATCH 0130/4780] new lint: vec_resize_to_zero --- CHANGELOG.md | 1 + clippy_lints/src/lib.rs | 5 +++ clippy_lints/src/utils/paths.rs | 1 + clippy_lints/src/vec_resize_to_zero.rs | 59 ++++++++++++++++++++++++++ src/lintlist/mod.rs | 7 +++ tests/ui/vec_resize_to_zero.rs | 15 +++++++ tests/ui/vec_resize_to_zero.stderr | 13 ++++++ 7 files changed, 101 insertions(+) create mode 100644 clippy_lints/src/vec_resize_to_zero.rs create mode 100644 tests/ui/vec_resize_to_zero.rs create mode 100644 tests/ui/vec_resize_to_zero.stderr diff --git a/CHANGELOG.md b/CHANGELOG.md index 2ac905719..f7dae3dcf 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1630,6 +1630,7 @@ Released 2018-09-13 [`useless_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_transmute [`useless_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_vec [`vec_box`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_box +[`vec_resize_to_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_resize_to_zero [`verbose_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_bit_mask [`verbose_file_reads`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_file_reads [`vtable_address_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#vtable_address_comparisons diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 902f3d56c..4f0ecab39 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -325,6 +325,7 @@ mod unwrap; mod use_self; mod useless_conversion; mod vec; +mod vec_resize_to_zero; mod verbose_file_reads; mod wildcard_dependencies; mod wildcard_imports; @@ -847,6 +848,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &utils::internal_lints::OUTER_EXPN_EXPN_DATA, &utils::internal_lints::PRODUCE_ICE, &vec::USELESS_VEC, + &vec_resize_to_zero::VEC_RESIZE_TO_ZERO, &verbose_file_reads::VERBOSE_FILE_READS, &wildcard_dependencies::WILDCARD_DEPENDENCIES, &wildcard_imports::ENUM_GLOB_USE, @@ -1062,6 +1064,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_early_pass(|| box manual_non_exhaustive::ManualNonExhaustive); store.register_late_pass(|| box manual_async_fn::ManualAsyncFn); store.register_early_pass(|| box redundant_field_names::RedundantFieldNames); + store.register_late_pass(|| box vec_resize_to_zero::VecResizeToZero); let single_char_binding_names_threshold = conf.single_char_binding_names_threshold; store.register_early_pass(move || box non_expressive_names::NonExpressiveNames { single_char_binding_names_threshold, @@ -1430,6 +1433,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&unwrap::UNNECESSARY_UNWRAP), LintId::of(&useless_conversion::USELESS_CONVERSION), LintId::of(&vec::USELESS_VEC), + LintId::of(&vec_resize_to_zero::VEC_RESIZE_TO_ZERO), LintId::of(&write::PRINTLN_EMPTY_STRING), LintId::of(&write::PRINT_LITERAL), LintId::of(&write::PRINT_WITH_NEWLINE), @@ -1677,6 +1681,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&unnamed_address::VTABLE_ADDRESS_COMPARISONS), LintId::of(&unused_io_amount::UNUSED_IO_AMOUNT), LintId::of(&unwrap::PANICKING_UNWRAP), + LintId::of(&vec_resize_to_zero::VEC_RESIZE_TO_ZERO), ]); store.register_group(true, "clippy::perf", Some("clippy_perf"), vec![ diff --git a/clippy_lints/src/utils/paths.rs b/clippy_lints/src/utils/paths.rs index 779da7e6b..3b7e97392 100644 --- a/clippy_lints/src/utils/paths.rs +++ b/clippy_lints/src/utils/paths.rs @@ -138,5 +138,6 @@ pub const VEC_AS_SLICE: [&str; 4] = ["alloc", "vec", "Vec", "as_slice"]; pub const VEC_DEQUE: [&str; 4] = ["alloc", "collections", "vec_deque", "VecDeque"]; pub const VEC_FROM_ELEM: [&str; 3] = ["alloc", "vec", "from_elem"]; pub const VEC_NEW: [&str; 4] = ["alloc", "vec", "Vec", "new"]; +pub const VEC_RESIZE: [&str; 4] = ["alloc", "vec", "Vec", "resize"]; pub const WEAK_ARC: [&str; 3] = ["alloc", "sync", "Weak"]; pub const WEAK_RC: [&str; 3] = ["alloc", "rc", "Weak"]; diff --git a/clippy_lints/src/vec_resize_to_zero.rs b/clippy_lints/src/vec_resize_to_zero.rs new file mode 100644 index 000000000..86cbfa820 --- /dev/null +++ b/clippy_lints/src/vec_resize_to_zero.rs @@ -0,0 +1,59 @@ +use crate::utils::span_lint_and_then; +use if_chain::if_chain; +use rustc_errors::Applicability; +use rustc_hir::{Expr, ExprKind}; +use rustc_lint::{LateContext, LateLintPass}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_span::source_map::Spanned; + +use crate::utils::{match_def_path, paths}; +use rustc_ast::ast::LitKind; +use rustc_hir as hir; + +declare_clippy_lint! { + /// **What it does:** Finds occurences of `Vec::resize(0, an_int)` + /// + /// **Why is this bad?** This is probably an argument inversion mistake. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// ```rust + /// vec!(1, 2, 3, 4, 5).resize(0, 5) + /// ``` + pub VEC_RESIZE_TO_ZERO, + correctness, + "emptying a vector with `resize(0, an_int)` instead of `clear()` is probably an argument inversion mistake" +} + +declare_lint_pass!(VecResizeToZero => [VEC_RESIZE_TO_ZERO]); + +impl<'a, 'tcx> LateLintPass<'a, 'tcx> for VecResizeToZero { + fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) { + if_chain! { + if let hir::ExprKind::MethodCall(path_segment, _, ref args) = expr.kind; + if let Some(method_def_id) = cx.tables.type_dependent_def_id(expr.hir_id); + if match_def_path(cx, method_def_id, &paths::VEC_RESIZE) && args.len() == 3; + if let ExprKind::Lit(Spanned { node: LitKind::Int(0, _), .. }) = args[1].kind; + if let ExprKind::Lit(Spanned { node: LitKind::Int(..), .. }) = args[2].kind; + then { + let method_call_span = expr.span.with_lo(path_segment.ident.span.lo()); + span_lint_and_then( + cx, + VEC_RESIZE_TO_ZERO, + expr.span, + "emptying a vector with `resize`", + |db| { + db.help("the arguments may be inverted..."); + db.span_suggestion( + method_call_span, + "...or you can empty the vector with", + "clear()".to_string(), + Applicability::MaybeIncorrect, + ); + }, + ); + } + } + } +} diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index f63301c7d..1e94ca00c 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -2460,6 +2460,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "types", }, + Lint { + name: "vec_resize_to_zero", + group: "correctness", + desc: "emptying a vector with `resize(0, an_int)` instead of `clear()` is probably an argument inversion mistake", + deprecation: None, + module: "vec_resize_to_zero", + }, Lint { name: "verbose_bit_mask", group: "style", diff --git a/tests/ui/vec_resize_to_zero.rs b/tests/ui/vec_resize_to_zero.rs new file mode 100644 index 000000000..0263e2f5f --- /dev/null +++ b/tests/ui/vec_resize_to_zero.rs @@ -0,0 +1,15 @@ +#![warn(clippy::vec_resize_to_zero)] + +fn main() { + // applicable here + vec![1, 2, 3, 4, 5].resize(0, 5); + + // not applicable + vec![1, 2, 3, 4, 5].resize(2, 5); + + // applicable here, but only implemented for integer litterals for now + vec!["foo", "bar", "baz"].resize(0, "bar"); + + // not applicable + vec!["foo", "bar", "baz"].resize(2, "bar") +} diff --git a/tests/ui/vec_resize_to_zero.stderr b/tests/ui/vec_resize_to_zero.stderr new file mode 100644 index 000000000..feb846298 --- /dev/null +++ b/tests/ui/vec_resize_to_zero.stderr @@ -0,0 +1,13 @@ +error: emptying a vector with `resize` + --> $DIR/vec_resize_to_zero.rs:5:5 + | +LL | vec![1, 2, 3, 4, 5].resize(0, 5); + | ^^^^^^^^^^^^^^^^^^^^------------ + | | + | help: ...or you can empty the vector with: `clear()` + | + = note: `-D clippy::vec-resize-to-zero` implied by `-D warnings` + = help: the arguments may be inverted... + +error: aborting due to previous error + From 37381d33a4761a064311dd95fbc54b5da6ad3766 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Sun, 31 May 2020 14:05:57 +0200 Subject: [PATCH 0131/4780] Fix sync fallout --- clippy_lints/src/needless_pass_by_value.rs | 8 +------- clippy_lints/src/write.rs | 13 ++++++------- tests/compile-test.rs | 7 ++++--- 3 files changed, 11 insertions(+), 17 deletions(-) diff --git a/clippy_lints/src/needless_pass_by_value.rs b/clippy_lints/src/needless_pass_by_value.rs index 218b0d27f..9c508fc0e 100644 --- a/clippy_lints/src/needless_pass_by_value.rs +++ b/clippy_lints/src/needless_pass_by_value.rs @@ -173,13 +173,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue { !preds.is_empty() && { let ty_empty_region = cx.tcx.mk_imm_ref(cx.tcx.lifetimes.re_root_empty, ty); preds.iter().all(|t| { - let ty_params = &t - .skip_binder() - .trait_ref - .substs - .iter() - .skip(1) - .collect::>(); + let ty_params = &t.skip_binder().trait_ref.substs.iter().skip(1).collect::>(); implements_trait(cx, ty_empty_region, t.def_id(), ty_params) }) }, diff --git a/clippy_lints/src/write.rs b/clippy_lints/src/write.rs index dfa6223f1..5f7945980 100644 --- a/clippy_lints/src/write.rs +++ b/clippy_lints/src/write.rs @@ -279,13 +279,12 @@ impl EarlyLintPass for Write { if let (Some(fmt_str), expr) = self.check_tts(cx, &mac.args.inner_tokens(), true) { if fmt_str.symbol == Symbol::intern("") { let mut applicability = Applicability::MachineApplicable; - let suggestion = expr.map_or_else( - move || { - applicability = Applicability::HasPlaceholders; - Cow::Borrowed("v") - }, - move |expr| snippet_with_applicability(cx, expr.span, "v", &mut applicability), - ); + let suggestion = if let Some(e) = expr { + snippet_with_applicability(cx, e.span, "v", &mut applicability) + } else { + applicability = Applicability::HasPlaceholders; + Cow::Borrowed("v") + }; span_lint_and_sugg( cx, diff --git a/tests/compile-test.rs b/tests/compile-test.rs index 1c4914a47..7bd5f09f3 100644 --- a/tests/compile-test.rs +++ b/tests/compile-test.rs @@ -153,9 +153,6 @@ fn run_ui_toml(config: &mut compiletest::Config) { } fn run_ui_cargo(config: &mut compiletest::Config) { - if cargo::is_rustc_test_suite() { - return; - } fn run_tests( config: &compiletest::Config, filter: &Option, @@ -216,6 +213,10 @@ fn run_ui_cargo(config: &mut compiletest::Config) { Ok(result) } + if cargo::is_rustc_test_suite() { + return; + } + config.mode = TestMode::Ui; config.src_base = Path::new("tests").join("ui-cargo").canonicalize().unwrap(); From 0bcfae92f80d31cad4e5fb687da8033a38d06a32 Mon Sep 17 00:00:00 2001 From: djugei Date: Sun, 31 May 2020 15:41:33 +0200 Subject: [PATCH 0132/4780] moved cast_ptr_alignment to pedantic and expanded documentation --- clippy_lints/src/types.rs | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index 6ed9ff22e..3ac99e246 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -974,7 +974,8 @@ declare_clippy_lint! { /// behavior. /// /// **Known problems:** Using `std::ptr::read_unaligned` and `std::ptr::write_unaligned` or similar - /// on the resulting pointer is fine. + /// on the resulting pointer is fine. Is over-zealous: Casts with manual alignment checks or casts like + /// u64-> u8 -> u16 can be fine. Miri is able to do a more in-depth analysis. /// /// **Example:** /// ```rust @@ -982,7 +983,7 @@ declare_clippy_lint! { /// let _ = (&mut 1u8 as *mut u8) as *mut u16; /// ``` pub CAST_PTR_ALIGNMENT, - correctness, + pedantic, "cast from a pointer to a more-strictly-aligned pointer" } From 18b5ceed7991e3d8616b74b42de26330ca4c40db Mon Sep 17 00:00:00 2001 From: djugei Date: Sun, 31 May 2020 16:00:29 +0200 Subject: [PATCH 0133/4780] ran update_lints --- clippy_lints/src/lib.rs | 3 +-- src/lintlist/mod.rs | 2 +- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 902f3d56c..6475fa67d 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -1164,6 +1164,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&types::CAST_POSSIBLE_TRUNCATION), LintId::of(&types::CAST_POSSIBLE_WRAP), LintId::of(&types::CAST_PRECISION_LOSS), + LintId::of(&types::CAST_PTR_ALIGNMENT), LintId::of(&types::CAST_SIGN_LOSS), LintId::of(&types::IMPLICIT_HASHER), LintId::of(&types::INVALID_UPCAST_COMPARISONS), @@ -1410,7 +1411,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&types::ABSURD_EXTREME_COMPARISONS), LintId::of(&types::BORROWED_BOX), LintId::of(&types::BOX_VEC), - LintId::of(&types::CAST_PTR_ALIGNMENT), LintId::of(&types::CAST_REF_TO_MUT), LintId::of(&types::CHAR_LIT_AS_U8), LintId::of(&types::FN_TO_NUMERIC_CAST), @@ -1669,7 +1669,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&transmute::WRONG_TRANSMUTE), LintId::of(&transmuting_null::TRANSMUTING_NULL), LintId::of(&types::ABSURD_EXTREME_COMPARISONS), - LintId::of(&types::CAST_PTR_ALIGNMENT), LintId::of(&types::CAST_REF_TO_MUT), LintId::of(&types::UNIT_CMP), LintId::of(&unicode::ZERO_WIDTH_SPACE), diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index f63301c7d..b9c846545 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -166,7 +166,7 @@ pub static ref ALL_LINTS: Vec = vec![ }, Lint { name: "cast_ptr_alignment", - group: "correctness", + group: "pedantic", desc: "cast from a pointer to a more-strictly-aligned pointer", deprecation: None, module: "types", From 6122612232976c1ac766a5d415265eb3eb30e72c Mon Sep 17 00:00:00 2001 From: Michael Wright Date: Sun, 31 May 2020 17:38:59 +0200 Subject: [PATCH 0134/4780] Increase cargo_metadata version to 0.9.1 `clippy_lints` makes use of `dep_kinds` on `NodeDep` but this was only added in versoin 0.9.1. Compiling with 0.9.0 will fail because of this. --- Cargo.toml | 2 +- clippy_lints/Cargo.toml | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/Cargo.toml b/Cargo.toml index 6999b6bd7..836897927 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -37,7 +37,7 @@ tempfile = { version = "3.1.0", optional = true } lazy_static = "1.0" [dev-dependencies] -cargo_metadata = "0.9.0" +cargo_metadata = "0.9.1" compiletest_rs = { version = "0.5.0", features = ["tmp"] } tester = "0.7" lazy_static = "1.0" diff --git a/clippy_lints/Cargo.toml b/clippy_lints/Cargo.toml index 76baf27fb..98391732d 100644 --- a/clippy_lints/Cargo.toml +++ b/clippy_lints/Cargo.toml @@ -17,7 +17,7 @@ keywords = ["clippy", "lint", "plugin"] edition = "2018" [dependencies] -cargo_metadata = "0.9.0" +cargo_metadata = "0.9.1" if_chain = "1.0.0" itertools = "0.9" lazy_static = "1.0.2" From 0ab823c509897ce2f516feb760fe1bf02cf77443 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Mon, 26 Aug 2019 18:34:30 +0200 Subject: [PATCH 0135/4780] Rework suggestion generation of `unit_arg` lint --- clippy_lints/src/types.rs | 42 ++++++++++++++++++++++++++++++--------- 1 file changed, 33 insertions(+), 9 deletions(-) diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index 3ac99e246..8fcca4b7b 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -779,6 +779,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitArg { match expr.kind { ExprKind::Call(_, args) | ExprKind::MethodCall(_, _, args) => { + let mut args_to_recover = vec![]; for arg in args { if is_unit(cx.tables.expr_ty(arg)) && !is_unit_literal(arg) { if let ExprKind::Match(.., match_source) = &arg.kind { @@ -787,17 +788,40 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitArg { } } - span_lint_and_sugg( - cx, - UNIT_ARG, - arg.span, - "passing a unit value to a function", - "if you intended to pass a unit value, use a unit literal instead", - "()".to_string(), - Applicability::MaybeIncorrect, - ); + args_to_recover.push(arg); } } + if !args_to_recover.is_empty() { + let mut applicability = Applicability::MachineApplicable; + span_lint_and_then(cx, UNIT_ARG, expr.span, "passing a unit value to a function", |db| { + db.span_suggestion( + expr.span.with_hi(expr.span.lo()), + "move the expressions in front of the call...", + format!( + "{} ", + args_to_recover + .iter() + .map(|arg| { + format!( + "{};", + snippet_with_applicability(cx, arg.span, "..", &mut applicability) + ) + }) + .collect::>() + .join(" ") + ), + applicability, + ); + db.multipart_suggestion( + "...and use unit literals instead", + args_to_recover + .iter() + .map(|arg| (arg.span, "()".to_string())) + .collect::>(), + applicability, + ); + }); + } }, _ => (), } From 380d941a045dc213ae28807d74fc32d1b1841e22 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Mon, 26 Aug 2019 19:35:25 +0200 Subject: [PATCH 0136/4780] Adapt stderr and fixed files --- tests/ui/unit_arg.fixed | 29 +++++++--- tests/ui/unit_arg.rs | 10 +++- tests/ui/unit_arg.stderr | 112 ++++++++++++++++++++++++++++++--------- 3 files changed, 118 insertions(+), 33 deletions(-) diff --git a/tests/ui/unit_arg.fixed b/tests/ui/unit_arg.fixed index a739cf7ad..67c6bdf88 100644 --- a/tests/ui/unit_arg.fixed +++ b/tests/ui/unit_arg.fixed @@ -1,6 +1,6 @@ // run-rustfix #![warn(clippy::unit_arg)] -#![allow(unused_braces, clippy::no_effect, unused_must_use)] +#![allow(clippy::no_effect, unused_must_use, unused_variables)] use std::fmt::Debug; @@ -21,13 +21,21 @@ impl Bar { } fn bad() { - foo(()); - foo(()); - foo(()); - foo(()); - foo3((), 2, 2); + {}; foo(()); + { + 1; + }; foo(()); + foo(1); foo(()); + { + foo(1); + foo(2); + }; foo(()); + {}; foo3((), 2, 2); let b = Bar; - b.bar(()); + { + 1; + }; b.bar(()); + foo(0); foo(1); taking_multiple_units((), ()); } fn ok() { @@ -58,6 +66,13 @@ mod issue_2945 { } } +#[allow(dead_code)] +fn returning_expr() -> Option<()> { + foo(1); Some(()) +} + +fn taking_multiple_units(a: (), b: ()) {} + fn main() { bad(); ok(); diff --git a/tests/ui/unit_arg.rs b/tests/ui/unit_arg.rs index d90c49f79..c6e465b2e 100644 --- a/tests/ui/unit_arg.rs +++ b/tests/ui/unit_arg.rs @@ -1,6 +1,6 @@ // run-rustfix #![warn(clippy::unit_arg)] -#![allow(unused_braces, clippy::no_effect, unused_must_use)] +#![allow(clippy::no_effect, unused_must_use, unused_variables)] use std::fmt::Debug; @@ -35,6 +35,7 @@ fn bad() { b.bar({ 1; }); + taking_multiple_units(foo(0), foo(1)); } fn ok() { @@ -65,6 +66,13 @@ mod issue_2945 { } } +#[allow(dead_code)] +fn returning_expr() -> Option<()> { + Some(foo(1)) +} + +fn taking_multiple_units(a: (), b: ()) {} + fn main() { bad(); ok(); diff --git a/tests/ui/unit_arg.stderr b/tests/ui/unit_arg.stderr index 21ccc684e..ce9ab2f12 100644 --- a/tests/ui/unit_arg.stderr +++ b/tests/ui/unit_arg.stderr @@ -1,79 +1,141 @@ error: passing a unit value to a function - --> $DIR/unit_arg.rs:24:9 + --> $DIR/unit_arg.rs:24:5 | LL | foo({}); - | ^^ + | ^^^^^^^ | = note: `-D clippy::unit-arg` implied by `-D warnings` -help: if you intended to pass a unit value, use a unit literal instead +help: move the expressions in front of the call... + | +LL | {}; foo({}); + | ^^^ +help: ...and use unit literals instead | LL | foo(()); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:25:9 + --> $DIR/unit_arg.rs:25:5 | -LL | foo({ - | _________^ +LL | / foo({ LL | | 1; LL | | }); - | |_____^ + | |______^ | -help: if you intended to pass a unit value, use a unit literal instead +help: move the expressions in front of the call... + | +LL | { +LL | 1; +LL | }; foo({ + | +help: ...and use unit literals instead | LL | foo(()); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:28:9 + --> $DIR/unit_arg.rs:28:5 | LL | foo(foo(1)); - | ^^^^^^ + | ^^^^^^^^^^^ | -help: if you intended to pass a unit value, use a unit literal instead +help: move the expressions in front of the call... + | +LL | foo(1); foo(foo(1)); + | ^^^^^^^ +help: ...and use unit literals instead | LL | foo(()); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:29:9 + --> $DIR/unit_arg.rs:29:5 | -LL | foo({ - | _________^ +LL | / foo({ LL | | foo(1); LL | | foo(2); LL | | }); - | |_____^ + | |______^ | -help: if you intended to pass a unit value, use a unit literal instead +help: move the expressions in front of the call... + | +LL | { +LL | foo(1); +LL | foo(2); +LL | }; foo({ + | +help: ...and use unit literals instead | LL | foo(()); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:33:10 + --> $DIR/unit_arg.rs:33:5 | LL | foo3({}, 2, 2); - | ^^ + | ^^^^^^^^^^^^^^ | -help: if you intended to pass a unit value, use a unit literal instead +help: move the expressions in front of the call... + | +LL | {}; foo3({}, 2, 2); + | ^^^ +help: ...and use unit literals instead | LL | foo3((), 2, 2); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:35:11 + --> $DIR/unit_arg.rs:35:5 | -LL | b.bar({ - | ___________^ +LL | / b.bar({ LL | | 1; LL | | }); - | |_____^ + | |______^ | -help: if you intended to pass a unit value, use a unit literal instead +help: move the expressions in front of the call... + | +LL | { +LL | 1; +LL | }; b.bar({ + | +help: ...and use unit literals instead | LL | b.bar(()); | ^^ -error: aborting due to 6 previous errors +error: passing a unit value to a function + --> $DIR/unit_arg.rs:38:5 + | +LL | taking_multiple_units(foo(0), foo(1)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: move the expressions in front of the call... + | +LL | foo(0); foo(1); taking_multiple_units(foo(0), foo(1)); + | ^^^^^^^^^^^^^^^ +help: ...and use unit literals instead + | +LL | taking_multiple_units((), foo(1)); + | ^^ +help: ...and use unit literals instead + | +LL | taking_multiple_units(foo(0), ()); + | ^^ + +error: passing a unit value to a function + --> $DIR/unit_arg.rs:71:5 + | +LL | Some(foo(1)) + | ^^^^^^^^^^^^ + | +help: move the expressions in front of the call... + | +LL | foo(1); Some(foo(1)) + | ^^^^^^^ +help: ...and use unit literals instead + | +LL | Some(()) + | ^^ + +error: aborting due to 8 previous errors From a1a1a4b82a35b810570dbf7d2ee7f00896bee232 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Mon, 26 Aug 2019 21:43:29 +0200 Subject: [PATCH 0137/4780] Use multiple span_suggestions instead of multipart_suggestion multipart suggestions aren't autofixable by rustfix yet --- clippy_lints/src/types.rs | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index 8fcca4b7b..3fbea7775 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -812,14 +812,14 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitArg { ), applicability, ); - db.multipart_suggestion( - "...and use unit literals instead", - args_to_recover - .iter() - .map(|arg| (arg.span, "()".to_string())) - .collect::>(), - applicability, - ); + for arg in args_to_recover { + db.span_suggestion( + arg.span, + "...and use unit literals instead", + "()".to_string(), + applicability, + ); + } }); } }, From 0f69cafc2dd77d573e24870887a4a13cfe50515a Mon Sep 17 00:00:00 2001 From: flip1995 Date: Mon, 17 Feb 2020 18:10:59 +0100 Subject: [PATCH 0138/4780] Rework suggestion generation and use multipart_suggestion again --- clippy_lints/src/types.rs | 55 +++++++++++++++++++++++---------------- 1 file changed, 33 insertions(+), 22 deletions(-) diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index 3fbea7775..c95bd5d72 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -794,32 +794,43 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitArg { if !args_to_recover.is_empty() { let mut applicability = Applicability::MachineApplicable; span_lint_and_then(cx, UNIT_ARG, expr.span, "passing a unit value to a function", |db| { + let sugg = args_to_recover + .iter() + .enumerate() + .map(|(i, arg)| { + let indent = if i == 0 { + 0 + } else { + indent_of(cx, expr.span).unwrap_or(0) + }; + format!( + "{}{};", + " ".repeat(indent), + snippet_block_with_applicability( + cx, + arg.span, + "..", + Some(expr.span), + &mut applicability + ) + ) + }) + .collect::>() + .join("\n"); db.span_suggestion( expr.span.with_hi(expr.span.lo()), - "move the expressions in front of the call...", - format!( - "{} ", - args_to_recover - .iter() - .map(|arg| { - format!( - "{};", - snippet_with_applicability(cx, arg.span, "..", &mut applicability) - ) - }) - .collect::>() - .join(" ") - ), + &format!("{}move the expressions in front of the call...", or), + format!("{}\n", sugg), + applicability, + ); + db.multipart_suggestion( + "...and use unit literals instead", + args_to_recover + .iter() + .map(|arg| (arg.span, "()".to_string())) + .collect::>(), applicability, ); - for arg in args_to_recover { - db.span_suggestion( - arg.span, - "...and use unit literals instead", - "()".to_string(), - applicability, - ); - } }); } }, From f9c325f5b657e0c37ba2016a51cddbeab7f7693f Mon Sep 17 00:00:00 2001 From: flip1995 Date: Mon, 17 Feb 2020 18:11:50 +0100 Subject: [PATCH 0139/4780] Suggest to remove the semicolon of the last stmt in a block --- clippy_lints/src/types.rs | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index c95bd5d72..51d7d9b3a 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -794,6 +794,36 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitArg { if !args_to_recover.is_empty() { let mut applicability = Applicability::MachineApplicable; span_lint_and_then(cx, UNIT_ARG, expr.span, "passing a unit value to a function", |db| { + let mut or = ""; + args_to_recover + .iter() + .filter_map(|arg| { + if_chain! { + if let ExprKind::Block(block, _) = arg.kind; + if block.expr.is_none(); + if let Some(last_stmt) = block.stmts.iter().last(); + if let StmtKind::Semi(last_expr) = last_stmt.kind; + if let Some(snip) = snippet_opt(cx, last_expr.span); + then { + Some(( + last_stmt.span, + snip, + )) + } + else { + None + } + } + }) + .for_each(|(span, sugg)| { + db.span_suggestion( + span, + "remove the semicolon from the last statement in the block", + sugg, + Applicability::MaybeIncorrect, + ); + or = "or "; + }); let sugg = args_to_recover .iter() .enumerate() From 4c9cefa12232aa0224b1680f51654fe10f5cf3b7 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Tue, 18 Feb 2020 09:51:52 +0100 Subject: [PATCH 0140/4780] Move linting out in its own function --- clippy_lints/src/types.rs | 171 ++++++++++++++++++++------------------ 1 file changed, 91 insertions(+), 80 deletions(-) diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index 51d7d9b3a..6866635b9 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -779,89 +779,22 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitArg { match expr.kind { ExprKind::Call(_, args) | ExprKind::MethodCall(_, _, args) => { - let mut args_to_recover = vec![]; - for arg in args { - if is_unit(cx.tables.expr_ty(arg)) && !is_unit_literal(arg) { - if let ExprKind::Match(.., match_source) = &arg.kind { - if *match_source == MatchSource::TryDesugar { - continue; + let args_to_recover = args + .iter() + .filter(|arg| { + if is_unit(cx.tables.expr_ty(arg)) && !is_unit_literal(arg) { + if let ExprKind::Match(.., MatchSource::TryDesugar) = &arg.kind { + false + } else { + true } + } else { + false } - - args_to_recover.push(arg); - } - } + }) + .collect::>(); if !args_to_recover.is_empty() { - let mut applicability = Applicability::MachineApplicable; - span_lint_and_then(cx, UNIT_ARG, expr.span, "passing a unit value to a function", |db| { - let mut or = ""; - args_to_recover - .iter() - .filter_map(|arg| { - if_chain! { - if let ExprKind::Block(block, _) = arg.kind; - if block.expr.is_none(); - if let Some(last_stmt) = block.stmts.iter().last(); - if let StmtKind::Semi(last_expr) = last_stmt.kind; - if let Some(snip) = snippet_opt(cx, last_expr.span); - then { - Some(( - last_stmt.span, - snip, - )) - } - else { - None - } - } - }) - .for_each(|(span, sugg)| { - db.span_suggestion( - span, - "remove the semicolon from the last statement in the block", - sugg, - Applicability::MaybeIncorrect, - ); - or = "or "; - }); - let sugg = args_to_recover - .iter() - .enumerate() - .map(|(i, arg)| { - let indent = if i == 0 { - 0 - } else { - indent_of(cx, expr.span).unwrap_or(0) - }; - format!( - "{}{};", - " ".repeat(indent), - snippet_block_with_applicability( - cx, - arg.span, - "..", - Some(expr.span), - &mut applicability - ) - ) - }) - .collect::>() - .join("\n"); - db.span_suggestion( - expr.span.with_hi(expr.span.lo()), - &format!("{}move the expressions in front of the call...", or), - format!("{}\n", sugg), - applicability, - ); - db.multipart_suggestion( - "...and use unit literals instead", - args_to_recover - .iter() - .map(|arg| (arg.span, "()".to_string())) - .collect::>(), - applicability, - ); - }); + lint_unit_args(cx, expr, &args_to_recover); } }, _ => (), @@ -869,6 +802,84 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitArg { } } +fn lint_unit_args(cx: &LateContext<'_, '_>, expr: &Expr<'_>, args_to_recover: &[&Expr<'_>]) { + let mut applicability = Applicability::MachineApplicable; + let (singular, plural) = if args_to_recover.len() > 1 { + ("", "s") + } else { + ("a ", "") + }; + span_lint_and_then( + cx, + UNIT_ARG, + expr.span, + &format!("passing {}unit value{} to a function", singular, plural), + |db| { + let mut or = ""; + args_to_recover + .iter() + .filter_map(|arg| { + if_chain! { + if let ExprKind::Block(block, _) = arg.kind; + if block.expr.is_none(); + if let Some(last_stmt) = block.stmts.iter().last(); + if let StmtKind::Semi(last_expr) = last_stmt.kind; + if let Some(snip) = snippet_opt(cx, last_expr.span); + then { + Some(( + last_stmt.span, + snip, + )) + } + else { + None + } + } + }) + .for_each(|(span, sugg)| { + db.span_suggestion( + span, + "remove the semicolon from the last statement in the block", + sugg, + Applicability::MaybeIncorrect, + ); + or = "or "; + }); + let sugg = args_to_recover + .iter() + .enumerate() + .map(|(i, arg)| { + let indent = if i == 0 { + 0 + } else { + indent_of(cx, expr.span).unwrap_or(0) + }; + format!( + "{}{};", + " ".repeat(indent), + snippet_block_with_applicability(cx, arg.span, "..", Some(expr.span), &mut applicability) + ) + }) + .collect::>() + .join("\n"); + db.span_suggestion( + expr.span.with_hi(expr.span.lo()), + &format!("{}move the expression{} in front of the call...", or, plural), + format!("{}\n", sugg), + applicability, + ); + db.multipart_suggestion( + &format!("...and use {}unit literal{} instead", singular, plural), + args_to_recover + .iter() + .map(|arg| (arg.span, "()".to_string())) + .collect::>(), + applicability, + ); + }, + ); +} + fn is_questionmark_desugar_marked_call(expr: &Expr<'_>) -> bool { use rustc_span::hygiene::DesugaringKind; if let ExprKind::Call(ref callee, _) = expr.kind { From 6d15a149640e5647ce232690d54b540346fa1641 Mon Sep 17 00:00:00 2001 From: flip1995 Date: Mon, 17 Feb 2020 18:12:01 +0100 Subject: [PATCH 0141/4780] Update test files --- tests/ui/unit_arg.fixed | 79 ------------------ tests/ui/unit_arg.rs | 15 +++- tests/ui/unit_arg.stderr | 170 +++++++++++++++++++++++++++------------ 3 files changed, 134 insertions(+), 130 deletions(-) delete mode 100644 tests/ui/unit_arg.fixed diff --git a/tests/ui/unit_arg.fixed b/tests/ui/unit_arg.fixed deleted file mode 100644 index 67c6bdf88..000000000 --- a/tests/ui/unit_arg.fixed +++ /dev/null @@ -1,79 +0,0 @@ -// run-rustfix -#![warn(clippy::unit_arg)] -#![allow(clippy::no_effect, unused_must_use, unused_variables)] - -use std::fmt::Debug; - -fn foo(t: T) { - println!("{:?}", t); -} - -fn foo3(t1: T1, t2: T2, t3: T3) { - println!("{:?}, {:?}, {:?}", t1, t2, t3); -} - -struct Bar; - -impl Bar { - fn bar(&self, t: T) { - println!("{:?}", t); - } -} - -fn bad() { - {}; foo(()); - { - 1; - }; foo(()); - foo(1); foo(()); - { - foo(1); - foo(2); - }; foo(()); - {}; foo3((), 2, 2); - let b = Bar; - { - 1; - }; b.bar(()); - foo(0); foo(1); taking_multiple_units((), ()); -} - -fn ok() { - foo(()); - foo(1); - foo({ 1 }); - foo3("a", 3, vec![3]); - let b = Bar; - b.bar({ 1 }); - b.bar(()); - question_mark(); -} - -fn question_mark() -> Result<(), ()> { - Ok(Ok(())?)?; - Ok(Ok(()))??; - Ok(()) -} - -#[allow(dead_code)] -mod issue_2945 { - fn unit_fn() -> Result<(), i32> { - Ok(()) - } - - fn fallible() -> Result<(), i32> { - Ok(unit_fn()?) - } -} - -#[allow(dead_code)] -fn returning_expr() -> Option<()> { - foo(1); Some(()) -} - -fn taking_multiple_units(a: (), b: ()) {} - -fn main() { - bad(); - ok(); -} diff --git a/tests/ui/unit_arg.rs b/tests/ui/unit_arg.rs index c6e465b2e..7d1b99fed 100644 --- a/tests/ui/unit_arg.rs +++ b/tests/ui/unit_arg.rs @@ -1,4 +1,3 @@ -// run-rustfix #![warn(clippy::unit_arg)] #![allow(clippy::no_effect, unused_must_use, unused_variables)] @@ -36,6 +35,20 @@ fn bad() { 1; }); taking_multiple_units(foo(0), foo(1)); + taking_multiple_units(foo(0), { + foo(1); + foo(2); + }); + taking_multiple_units( + { + foo(0); + foo(1); + }, + { + foo(2); + foo(3); + }, + ); } fn ok() { diff --git a/tests/ui/unit_arg.stderr b/tests/ui/unit_arg.stderr index ce9ab2f12..145b3c62b 100644 --- a/tests/ui/unit_arg.stderr +++ b/tests/ui/unit_arg.stderr @@ -1,34 +1,53 @@ error: passing a unit value to a function - --> $DIR/unit_arg.rs:24:5 + --> $DIR/unit_arg.rs:23:5 | LL | foo({}); | ^^^^^^^ | = note: `-D clippy::unit-arg` implied by `-D warnings` -help: move the expressions in front of the call... +help: move the expression in front of the call... | -LL | {}; foo({}); - | ^^^ -help: ...and use unit literals instead +LL | {}; + | +help: ...and use a unit literal instead | LL | foo(()); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:25:5 + --> $DIR/unit_arg.rs:24:5 | LL | / foo({ LL | | 1; LL | | }); | |______^ | -help: move the expressions in front of the call... +help: remove the semicolon from the last statement in the block + | +LL | 1 + | +help: or move the expression in front of the call... | LL | { LL | 1; -LL | }; foo({ +LL | }; | -help: ...and use unit literals instead +help: ...and use a unit literal instead + | +LL | foo(()); + | ^^ + +error: passing a unit value to a function + --> $DIR/unit_arg.rs:27:5 + | +LL | foo(foo(1)); + | ^^^^^^^^^^^ + | +help: move the expression in front of the call... + | +LL | foo(1); + | +help: ...and use a unit literal instead | LL | foo(()); | ^^ @@ -36,106 +55,157 @@ LL | foo(()); error: passing a unit value to a function --> $DIR/unit_arg.rs:28:5 | -LL | foo(foo(1)); - | ^^^^^^^^^^^ - | -help: move the expressions in front of the call... - | -LL | foo(1); foo(foo(1)); - | ^^^^^^^ -help: ...and use unit literals instead - | -LL | foo(()); - | ^^ - -error: passing a unit value to a function - --> $DIR/unit_arg.rs:29:5 - | LL | / foo({ LL | | foo(1); LL | | foo(2); LL | | }); | |______^ | -help: move the expressions in front of the call... +help: remove the semicolon from the last statement in the block + | +LL | foo(2) + | +help: or move the expression in front of the call... | LL | { LL | foo(1); LL | foo(2); -LL | }; foo({ +LL | }; | -help: ...and use unit literals instead +help: ...and use a unit literal instead | LL | foo(()); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:33:5 + --> $DIR/unit_arg.rs:32:5 | LL | foo3({}, 2, 2); | ^^^^^^^^^^^^^^ | -help: move the expressions in front of the call... +help: move the expression in front of the call... | -LL | {}; foo3({}, 2, 2); - | ^^^ -help: ...and use unit literals instead +LL | {}; + | +help: ...and use a unit literal instead | LL | foo3((), 2, 2); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:35:5 + --> $DIR/unit_arg.rs:34:5 | LL | / b.bar({ LL | | 1; LL | | }); | |______^ | -help: move the expressions in front of the call... +help: remove the semicolon from the last statement in the block + | +LL | 1 + | +help: or move the expression in front of the call... | LL | { LL | 1; -LL | }; b.bar({ +LL | }; | -help: ...and use unit literals instead +help: ...and use a unit literal instead | LL | b.bar(()); | ^^ -error: passing a unit value to a function - --> $DIR/unit_arg.rs:38:5 +error: passing unit values to a function + --> $DIR/unit_arg.rs:37:5 | LL | taking_multiple_units(foo(0), foo(1)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | help: move the expressions in front of the call... | -LL | foo(0); foo(1); taking_multiple_units(foo(0), foo(1)); - | ^^^^^^^^^^^^^^^ +LL | foo(0); +LL | foo(1); + | help: ...and use unit literals instead | -LL | taking_multiple_units((), foo(1)); - | ^^ +LL | taking_multiple_units((), ()); + | ^^ ^^ + +error: passing unit values to a function + --> $DIR/unit_arg.rs:38:5 + | +LL | / taking_multiple_units(foo(0), { +LL | | foo(1); +LL | | foo(2); +LL | | }); + | |______^ + | +help: remove the semicolon from the last statement in the block + | +LL | foo(2) + | +help: or move the expressions in front of the call... + | +LL | foo(0); +LL | { +LL | foo(1); +LL | foo(2); +LL | }; + | help: ...and use unit literals instead | -LL | taking_multiple_units(foo(0), ()); - | ^^ +LL | taking_multiple_units((), ()); + | ^^ ^^ + +error: passing unit values to a function + --> $DIR/unit_arg.rs:42:5 + | +LL | / taking_multiple_units( +LL | | { +LL | | foo(0); +LL | | foo(1); +... | +LL | | }, +LL | | ); + | |_____^ + | +help: remove the semicolon from the last statement in the block + | +LL | foo(1) + | +help: remove the semicolon from the last statement in the block + | +LL | foo(3) + | +help: or move the expressions in front of the call... + | +LL | { +LL | foo(0); +LL | foo(1); +LL | }; +LL | { +LL | foo(2); + ... +help: ...and use unit literals instead + | +LL | (), +LL | (), + | error: passing a unit value to a function - --> $DIR/unit_arg.rs:71:5 + --> $DIR/unit_arg.rs:84:5 | LL | Some(foo(1)) | ^^^^^^^^^^^^ | -help: move the expressions in front of the call... +help: move the expression in front of the call... | -LL | foo(1); Some(foo(1)) - | ^^^^^^^ -help: ...and use unit literals instead +LL | foo(1); + | +help: ...and use a unit literal instead | LL | Some(()) | ^^ -error: aborting due to 8 previous errors +error: aborting due to 10 previous errors From a9cde3a804808e82402888a20878053404a8eded Mon Sep 17 00:00:00 2001 From: flip1995 Date: Sun, 31 May 2020 18:45:16 +0200 Subject: [PATCH 0142/4780] Don't suggest to move empty blocks --- clippy_lints/src/types.rs | 43 +++++++++++++++++++++++++++------------ 1 file changed, 30 insertions(+), 13 deletions(-) diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index 6866635b9..5ca30d598 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -10,7 +10,7 @@ use rustc_errors::{Applicability, DiagnosticBuilder}; use rustc_hir as hir; use rustc_hir::intravisit::{walk_body, walk_expr, walk_ty, FnKind, NestedVisitorMap, Visitor}; use rustc_hir::{ - BinOpKind, Body, Expr, ExprKind, FnDecl, FnRetTy, FnSig, GenericArg, GenericParamKind, HirId, ImplItem, + BinOpKind, Block, Body, Expr, ExprKind, FnDecl, FnRetTy, FnSig, GenericArg, GenericParamKind, HirId, ImplItem, ImplItemKind, Item, ItemKind, Lifetime, Local, MatchSource, MutTy, Mutability, QPath, Stmt, StmtKind, TraitFn, TraitItem, TraitItemKind, TyKind, UnOp, }; @@ -29,10 +29,10 @@ use rustc_typeck::hir_ty_to_ty; use crate::consts::{constant, Constant}; use crate::utils::paths; use crate::utils::{ - clip, comparisons, differing_macro_contexts, higher, in_constant, int_bits, is_type_diagnostic_item, + clip, comparisons, differing_macro_contexts, higher, in_constant, indent_of, int_bits, is_type_diagnostic_item, last_path_segment, match_def_path, match_path, method_chain_args, multispan_sugg, numeric_literal::NumericLiteral, - qpath_res, same_tys, sext, snippet, snippet_opt, snippet_with_applicability, snippet_with_macro_callsite, - span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, unsext, + qpath_res, same_tys, sext, snippet, snippet_block_with_applicability, snippet_opt, snippet_with_applicability, + snippet_with_macro_callsite, span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, unsext, }; declare_clippy_lint! { @@ -847,6 +847,7 @@ fn lint_unit_args(cx: &LateContext<'_, '_>, expr: &Expr<'_>, args_to_recover: &[ }); let sugg = args_to_recover .iter() + .filter(|arg| !is_empty_block(arg)) .enumerate() .map(|(i, arg)| { let indent = if i == 0 { @@ -860,16 +861,20 @@ fn lint_unit_args(cx: &LateContext<'_, '_>, expr: &Expr<'_>, args_to_recover: &[ snippet_block_with_applicability(cx, arg.span, "..", Some(expr.span), &mut applicability) ) }) - .collect::>() - .join("\n"); - db.span_suggestion( - expr.span.with_hi(expr.span.lo()), - &format!("{}move the expression{} in front of the call...", or, plural), - format!("{}\n", sugg), - applicability, - ); + .collect::>(); + let mut and = ""; + if !sugg.is_empty() { + let plural = if sugg.len() > 1 { "s" } else { "" }; + db.span_suggestion( + expr.span.with_hi(expr.span.lo()), + &format!("{}move the expression{} in front of the call...", or, plural), + format!("{}\n", sugg.join("\n")), + applicability, + ); + and = "...and " + } db.multipart_suggestion( - &format!("...and use {}unit literal{} instead", singular, plural), + &format!("{}use {}unit literal{} instead", and, singular, plural), args_to_recover .iter() .map(|arg| (arg.span, "()".to_string())) @@ -880,6 +885,18 @@ fn lint_unit_args(cx: &LateContext<'_, '_>, expr: &Expr<'_>, args_to_recover: &[ ); } +fn is_empty_block(expr: &Expr<'_>) -> bool { + matches!( + expr.kind, + ExprKind::Block( + Block { + stmts: &[], expr: None, .. + }, + _, + ) + ) +} + fn is_questionmark_desugar_marked_call(expr: &Expr<'_>) -> bool { use rustc_span::hygiene::DesugaringKind; if let ExprKind::Call(ref callee, _) = expr.kind { From 77dd0ea62aa6a2af70da4c5e05de064eee182a6c Mon Sep 17 00:00:00 2001 From: flip1995 Date: Sun, 31 May 2020 19:29:36 +0200 Subject: [PATCH 0143/4780] Add tests for empty blocks --- tests/ui/unit_arg.rs | 2 -- tests/ui/unit_arg.stderr | 46 +++++------------------- tests/ui/unit_arg_empty_blocks.rs | 26 ++++++++++++++ tests/ui/unit_arg_empty_blocks.stderr | 51 +++++++++++++++++++++++++++ 4 files changed, 85 insertions(+), 40 deletions(-) create mode 100644 tests/ui/unit_arg_empty_blocks.rs create mode 100644 tests/ui/unit_arg_empty_blocks.stderr diff --git a/tests/ui/unit_arg.rs b/tests/ui/unit_arg.rs index 7d1b99fed..2992abae7 100644 --- a/tests/ui/unit_arg.rs +++ b/tests/ui/unit_arg.rs @@ -20,7 +20,6 @@ impl Bar { } fn bad() { - foo({}); foo({ 1; }); @@ -29,7 +28,6 @@ fn bad() { foo(1); foo(2); }); - foo3({}, 2, 2); let b = Bar; b.bar({ 1; diff --git a/tests/ui/unit_arg.stderr b/tests/ui/unit_arg.stderr index 145b3c62b..56f6a855d 100644 --- a/tests/ui/unit_arg.stderr +++ b/tests/ui/unit_arg.stderr @@ -1,27 +1,12 @@ error: passing a unit value to a function --> $DIR/unit_arg.rs:23:5 | -LL | foo({}); - | ^^^^^^^ - | - = note: `-D clippy::unit-arg` implied by `-D warnings` -help: move the expression in front of the call... - | -LL | {}; - | -help: ...and use a unit literal instead - | -LL | foo(()); - | ^^ - -error: passing a unit value to a function - --> $DIR/unit_arg.rs:24:5 - | LL | / foo({ LL | | 1; LL | | }); | |______^ | + = note: `-D clippy::unit-arg` implied by `-D warnings` help: remove the semicolon from the last statement in the block | LL | 1 @@ -38,7 +23,7 @@ LL | foo(()); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:27:5 + --> $DIR/unit_arg.rs:26:5 | LL | foo(foo(1)); | ^^^^^^^^^^^ @@ -53,7 +38,7 @@ LL | foo(()); | ^^ error: passing a unit value to a function - --> $DIR/unit_arg.rs:28:5 + --> $DIR/unit_arg.rs:27:5 | LL | / foo({ LL | | foo(1); @@ -80,21 +65,6 @@ LL | foo(()); error: passing a unit value to a function --> $DIR/unit_arg.rs:32:5 | -LL | foo3({}, 2, 2); - | ^^^^^^^^^^^^^^ - | -help: move the expression in front of the call... - | -LL | {}; - | -help: ...and use a unit literal instead - | -LL | foo3((), 2, 2); - | ^^ - -error: passing a unit value to a function - --> $DIR/unit_arg.rs:34:5 - | LL | / b.bar({ LL | | 1; LL | | }); @@ -116,7 +86,7 @@ LL | b.bar(()); | ^^ error: passing unit values to a function - --> $DIR/unit_arg.rs:37:5 + --> $DIR/unit_arg.rs:35:5 | LL | taking_multiple_units(foo(0), foo(1)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -132,7 +102,7 @@ LL | taking_multiple_units((), ()); | ^^ ^^ error: passing unit values to a function - --> $DIR/unit_arg.rs:38:5 + --> $DIR/unit_arg.rs:36:5 | LL | / taking_multiple_units(foo(0), { LL | | foo(1); @@ -158,7 +128,7 @@ LL | taking_multiple_units((), ()); | ^^ ^^ error: passing unit values to a function - --> $DIR/unit_arg.rs:42:5 + --> $DIR/unit_arg.rs:40:5 | LL | / taking_multiple_units( LL | | { @@ -193,7 +163,7 @@ LL | (), | error: passing a unit value to a function - --> $DIR/unit_arg.rs:84:5 + --> $DIR/unit_arg.rs:82:5 | LL | Some(foo(1)) | ^^^^^^^^^^^^ @@ -207,5 +177,5 @@ help: ...and use a unit literal instead LL | Some(()) | ^^ -error: aborting due to 10 previous errors +error: aborting due to 8 previous errors diff --git a/tests/ui/unit_arg_empty_blocks.rs b/tests/ui/unit_arg_empty_blocks.rs new file mode 100644 index 000000000..18a31eb3d --- /dev/null +++ b/tests/ui/unit_arg_empty_blocks.rs @@ -0,0 +1,26 @@ +#![warn(clippy::unit_arg)] +#![allow(clippy::no_effect, unused_must_use, unused_variables)] + +use std::fmt::Debug; + +fn foo(t: T) { + println!("{:?}", t); +} + +fn foo3(t1: T1, t2: T2, t3: T3) { + println!("{:?}, {:?}, {:?}", t1, t2, t3); +} + +fn bad() { + foo({}); + foo3({}, 2, 2); + taking_two_units({}, foo(0)); + taking_three_units({}, foo(0), foo(1)); +} + +fn taking_two_units(a: (), b: ()) {} +fn taking_three_units(a: (), b: (), c: ()) {} + +fn main() { + bad(); +} diff --git a/tests/ui/unit_arg_empty_blocks.stderr b/tests/ui/unit_arg_empty_blocks.stderr new file mode 100644 index 000000000..bb5848358 --- /dev/null +++ b/tests/ui/unit_arg_empty_blocks.stderr @@ -0,0 +1,51 @@ +error: passing a unit value to a function + --> $DIR/unit_arg_empty_blocks.rs:15:5 + | +LL | foo({}); + | ^^^^--^ + | | + | help: use a unit literal instead: `()` + | + = note: `-D clippy::unit-arg` implied by `-D warnings` + +error: passing a unit value to a function + --> $DIR/unit_arg_empty_blocks.rs:16:5 + | +LL | foo3({}, 2, 2); + | ^^^^^--^^^^^^^ + | | + | help: use a unit literal instead: `()` + +error: passing unit values to a function + --> $DIR/unit_arg_empty_blocks.rs:17:5 + | +LL | taking_two_units({}, foo(0)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: move the expression in front of the call... + | +LL | foo(0); + | +help: ...and use unit literals instead + | +LL | taking_two_units((), ()); + | ^^ ^^ + +error: passing unit values to a function + --> $DIR/unit_arg_empty_blocks.rs:18:5 + | +LL | taking_three_units({}, foo(0), foo(1)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | +help: move the expressions in front of the call... + | +LL | foo(0); +LL | foo(1); + | +help: ...and use unit literals instead + | +LL | taking_three_units((), (), ()); + | ^^ ^^ ^^ + +error: aborting due to 4 previous errors + From 14e9100543166e48acd0ea00233249d2cddf09c2 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 25 May 2020 00:41:13 +0200 Subject: [PATCH 0144/4780] cargo-ui tests: check that /src exists before processing test --- tests/compile-test.rs | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/tests/compile-test.rs b/tests/compile-test.rs index 7bd5f09f3..194354b29 100644 --- a/tests/compile-test.rs +++ b/tests/compile-test.rs @@ -181,8 +181,15 @@ fn run_ui_cargo(config: &mut compiletest::Config) { } let src_path = case.path().join("src"); - env::set_current_dir(&src_path)?; + // When switching between branches, if the previous branch had a test + // that the current branch does not have, the directory is not removed + // because an ignored Cargo.lock file exists. + if !src_path.exists() { + continue; + } + + env::set_current_dir(&src_path)?; for file in fs::read_dir(&src_path)? { let file = file?; if file.file_type()?.is_dir() { From 7e843515d9525b6389c3fc1bcfa6ae046c1351dc Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Thu, 14 May 2020 15:06:05 -0700 Subject: [PATCH 0145/4780] Created lint --- CHANGELOG.md | 1 + clippy_lints/src/lib.rs | 4 ++++ clippy_lints/src/sort_by_key_reverse.rs | 28 +++++++++++++++++++++++++ src/lintlist/mod.rs | 7 +++++++ tests/ui/sort_by_key_reverse.rs | 5 +++++ 5 files changed, 45 insertions(+) create mode 100644 clippy_lints/src/sort_by_key_reverse.rs create mode 100644 tests/ui/sort_by_key_reverse.rs diff --git a/CHANGELOG.md b/CHANGELOG.md index f7dae3dcf..c00f84bdb 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1555,6 +1555,7 @@ Released 2018-09-13 [`single_match_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_match_else [`skip_while_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#skip_while_next [`slow_vector_initialization`]: https://rust-lang.github.io/rust-clippy/master/index.html#slow_vector_initialization +[`sort_by_key_reverse`]: https://rust-lang.github.io/rust-clippy/master/index.html#sort_by_key_reverse [`str_to_string`]: https://rust-lang.github.io/rust-clippy/master/index.html#str_to_string [`string_add`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_add [`string_add_assign`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_add_assign diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 38cfa212d..f51855bad 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -304,6 +304,7 @@ mod serde_api; mod shadow; mod single_component_path_imports; mod slow_vector_initialization; +mod sort_by_key_reverse; mod strings; mod suspicious_trait_impl; mod swap; @@ -779,6 +780,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &shadow::SHADOW_UNRELATED, &single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS, &slow_vector_initialization::SLOW_VECTOR_INITIALIZATION, + &sort_by_key_reverse::SORT_BY_KEY_REVERSE, &strings::STRING_ADD, &strings::STRING_ADD_ASSIGN, &strings::STRING_LIT_AS_BYTES, @@ -1391,6 +1393,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&serde_api::SERDE_API_MISUSE), LintId::of(&single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS), LintId::of(&slow_vector_initialization::SLOW_VECTOR_INITIALIZATION), + LintId::of(&sort_by_key_reverse::SORT_BY_KEY_REVERSE), LintId::of(&strings::STRING_LIT_AS_BYTES), LintId::of(&suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL), LintId::of(&suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL), @@ -1592,6 +1595,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&ranges::RANGE_ZIP_WITH_LEN), LintId::of(&reference::DEREF_ADDROF), LintId::of(&reference::REF_IN_DEREF), + LintId::of(&sort_by_key_reverse::SORT_BY_KEY_REVERSE), LintId::of(&swap::MANUAL_SWAP), LintId::of(&temporary_assignment::TEMPORARY_ASSIGNMENT), LintId::of(&transmute::CROSSPOINTER_TRANSMUTE), diff --git a/clippy_lints/src/sort_by_key_reverse.rs b/clippy_lints/src/sort_by_key_reverse.rs new file mode 100644 index 000000000..65830afd0 --- /dev/null +++ b/clippy_lints/src/sort_by_key_reverse.rs @@ -0,0 +1,28 @@ +use rustc_lint::{LateLintPass, LateContext}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_hir::*; + +declare_clippy_lint! { + /// **What it does:** + /// + /// **Why is this bad?** + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// ```rust + /// // example code where clippy issues a warning + /// ``` + /// Use instead: + /// ```rust + /// // example code which does not raise clippy warning + /// ``` + pub SORT_BY_KEY_REVERSE, + complexity, + "default lint description" +} + +declare_lint_pass!(SortByKeyReverse => [SORT_BY_KEY_REVERSE]); + +impl LateLintPass<'_, '_> for SortByKeyReverse {} diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 695787328..1b82f34c8 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1984,6 +1984,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "slow_vector_initialization", }, + Lint { + name: "sort_by_key_reverse", + group: "complexity", + desc: "default lint description", + deprecation: None, + module: "sort_by_key_reverse", + }, Lint { name: "string_add", group: "restriction", diff --git a/tests/ui/sort_by_key_reverse.rs b/tests/ui/sort_by_key_reverse.rs new file mode 100644 index 000000000..2338dc6e5 --- /dev/null +++ b/tests/ui/sort_by_key_reverse.rs @@ -0,0 +1,5 @@ +#![warn(clippy::sort_by_key_reverse)] + +fn main() { + // test code goes here +} From 24847ea53e332853597aca2c7dfe48a9f3be1de8 Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Sat, 16 May 2020 13:50:33 -0700 Subject: [PATCH 0146/4780] Attempted start at sort_by_key_reverse lint --- clippy_lints/src/sort_by_key_reverse.rs | 71 +++++++++++++++++++++++-- src/lintlist/mod.rs | 2 +- tests/ui/sort_by_key_reverse.fixed | 0 tests/ui/sort_by_key_reverse.rs | 3 +- tests/ui/sort_by_key_reverse.stderr | 0 5 files changed, 70 insertions(+), 6 deletions(-) create mode 100644 tests/ui/sort_by_key_reverse.fixed create mode 100644 tests/ui/sort_by_key_reverse.stderr diff --git a/clippy_lints/src/sort_by_key_reverse.rs b/clippy_lints/src/sort_by_key_reverse.rs index 65830afd0..7d7097a81 100644 --- a/clippy_lints/src/sort_by_key_reverse.rs +++ b/clippy_lints/src/sort_by_key_reverse.rs @@ -1,28 +1,91 @@ +use crate::utils::{match_type, span_lint_and_sugg}; +use crate::utils::paths; +use crate::utils::sugg::Sugg; +use if_chain::if_chain; +use rustc_errors::Applicability; use rustc_lint::{LateLintPass, LateContext}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_hir::*; declare_clippy_lint! { /// **What it does:** + /// Detects when people use `Vec::sort_by` and pass in a function + /// which compares the second argument to the first. /// /// **Why is this bad?** + /// It is more clear to use `Vec::sort_by_key` and `std::cmp::Reverse` /// /// **Known problems:** None. /// /// **Example:** /// /// ```rust - /// // example code where clippy issues a warning + /// vec.sort_by(|a, b| b.foo().cmp(&a.foo())); /// ``` /// Use instead: /// ```rust - /// // example code which does not raise clippy warning + /// vec.sort_by_key(|e| Reverse(e.foo())); /// ``` pub SORT_BY_KEY_REVERSE, complexity, - "default lint description" + "Use of `Vec::sort_by` when `Vec::sort_by_key` would be clearer" } declare_lint_pass!(SortByKeyReverse => [SORT_BY_KEY_REVERSE]); -impl LateLintPass<'_, '_> for SortByKeyReverse {} +struct LintTrigger { + vec_name: String, + closure_arg: String, + closure_reverse_body: String, + unstable: bool, +} + +fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option { + if_chain! { + if let ExprKind::MethodCall(name_ident, _, args) = &expr.kind; + if let name = name_ident.ident.name.to_ident_string(); + if name == "sort_by" || name == "sort_unstable_by"; + if let [vec, Expr { kind: ExprKind::Closure(_, closure_decl, closure_body_id, _, _), .. }] = args; + if closure_decl.inputs.len() == 2; + if match_type(cx, &cx.tables.expr_ty(vec), &paths::VEC); + then { + let vec_name = Sugg::hir(cx, &args[0], "..").to_string(); + let unstable = name == "sort_unstable_by"; + Some(LintTrigger { vec_name, unstable, closure_arg: "e".to_string(), closure_reverse_body: "e".to_string() }) + } else { + None + } + } +} + +impl LateLintPass<'_, '_> for SortByKeyReverse { + fn check_expr(&mut self, cx: &LateContext<'_, '_>, expr: &Expr<'_>) { + println!("{:?}", expr); + span_lint_and_sugg( + cx, + SORT_BY_KEY_REVERSE, + expr.span, + "use Vec::sort_by_key here instead", + "try", + String::from("being a better person"), + Applicability::MachineApplicable, + ); + if let Some(trigger) = detect_lint(cx, expr) { + span_lint_and_sugg( + cx, + SORT_BY_KEY_REVERSE, + expr.span, + "use Vec::sort_by_key here instead", + "try", + format!( + "{}.sort{}_by_key(|{}| Reverse({}))", + trigger.vec_name, + if trigger.unstable { "_unstable" } else { "" }, + trigger.closure_arg, + trigger.closure_reverse_body, + ), + Applicability::MachineApplicable, + ); + } + } +} diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 1b82f34c8..b5d9ef011 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1987,7 +1987,7 @@ pub static ref ALL_LINTS: Vec = vec![ Lint { name: "sort_by_key_reverse", group: "complexity", - desc: "default lint description", + desc: "Use of `Vec::sort_by` when `Vec::sort_by_key` would be clearer", deprecation: None, module: "sort_by_key_reverse", }, diff --git a/tests/ui/sort_by_key_reverse.fixed b/tests/ui/sort_by_key_reverse.fixed new file mode 100644 index 000000000..e69de29bb diff --git a/tests/ui/sort_by_key_reverse.rs b/tests/ui/sort_by_key_reverse.rs index 2338dc6e5..c0350f243 100644 --- a/tests/ui/sort_by_key_reverse.rs +++ b/tests/ui/sort_by_key_reverse.rs @@ -1,5 +1,6 @@ #![warn(clippy::sort_by_key_reverse)] fn main() { - // test code goes here + let mut vec = vec![3, 6, 1, 2, 5]; + vec.sort_by(|a, b| b.cmp(a)); } diff --git a/tests/ui/sort_by_key_reverse.stderr b/tests/ui/sort_by_key_reverse.stderr new file mode 100644 index 000000000..e69de29bb From 8590ab4d46de4eb43e7ebd42cb2f13b0064573e6 Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Mon, 18 May 2020 21:48:35 -0700 Subject: [PATCH 0147/4780] More progress towards sort_by_key_reverse lint --- clippy_lints/src/lib.rs | 1 + clippy_lints/src/sort_by_key_reverse.rs | 131 ++++++++++++++++++++---- tests/ui/sort_by_key_reverse.fixed | 9 ++ tests/ui/sort_by_key_reverse.rs | 5 +- tests/ui/sort_by_key_reverse.stderr | 22 ++++ 5 files changed, 149 insertions(+), 19 deletions(-) diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index f51855bad..e7a4c1eca 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -998,6 +998,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box ptr_offset_with_cast::PtrOffsetWithCast); store.register_late_pass(|| box redundant_clone::RedundantClone); store.register_late_pass(|| box slow_vector_initialization::SlowVectorInit); + store.register_late_pass(|| box sort_by_key_reverse::SortByKeyReverse); store.register_late_pass(|| box types::RefToMut); store.register_late_pass(|| box assertions_on_constants::AssertionsOnConstants); store.register_late_pass(|| box missing_const_for_fn::MissingConstForFn); diff --git a/clippy_lints/src/sort_by_key_reverse.rs b/clippy_lints/src/sort_by_key_reverse.rs index 7d7097a81..d70391999 100644 --- a/clippy_lints/src/sort_by_key_reverse.rs +++ b/clippy_lints/src/sort_by_key_reverse.rs @@ -1,11 +1,12 @@ -use crate::utils::{match_type, span_lint_and_sugg}; +use crate::utils; use crate::utils::paths; use crate::utils::sugg::Sugg; use if_chain::if_chain; use rustc_errors::Applicability; -use rustc_lint::{LateLintPass, LateContext}; -use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_hir::*; +use rustc_lint::{LateContext, LateLintPass}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_span::symbol::Ident; declare_clippy_lint! { /// **What it does:** @@ -40,18 +41,122 @@ struct LintTrigger { unstable: bool, } +/// Detect if the two expressions are mirrored (identical, except one +/// contains a and the other replaces it with b) +fn mirrored_exprs(cx: &LateContext<'_, '_>, a_expr: &Expr<'_>, a_ident: &Ident, b_expr: &Expr<'_>, b_ident: &Ident) -> bool { + match (&a_expr.kind, &b_expr.kind) { + // Two boxes with mirrored contents + (ExprKind::Box(left_expr), ExprKind::Box(right_expr)) => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), + // Two arrays with mirrored contents + (ExprKind::Array(left_exprs), ExprKind::Array(right_exprs)) + => left_exprs.iter().zip(right_exprs.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), + // The two exprs are function calls. + // Check to see that the function itself and its arguments are mirrored + (ExprKind::Call(left_expr, left_args), ExprKind::Call(right_expr, right_args)) + => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident) + && left_args.iter().zip(right_args.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), + // The two exprs are method calls. + // Check to see that the function is the same and the arguments are mirrored + // This is enough because the receiver of the method is listed in the arguments + (ExprKind::MethodCall(left_segment, _, left_args), ExprKind::MethodCall(right_segment, _, right_args)) + => left_segment.ident == right_segment.ident + && left_args.iter().zip(right_args.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), + // Two tuples with mirrored contents + (ExprKind::Tup(left_exprs), ExprKind::Tup(right_exprs)) + => left_exprs.iter().zip(right_exprs.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), + // Two binary ops, which are the same operation and which have mirrored arguments + (ExprKind::Binary(left_op, left_left, left_right), ExprKind::Binary(right_op, right_left, right_right)) + => left_op.node == right_op.node + && mirrored_exprs(cx, left_left, a_ident, right_left, b_ident) + && mirrored_exprs(cx, left_right, a_ident, right_right, b_ident), + // Two unary ops, which are the same operation and which have the same argument + (ExprKind::Unary(left_op, left_expr), ExprKind::Unary(right_op, right_expr)) + => left_op == right_op && mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), + // The two exprs are literals of some kind + (ExprKind::Lit(left_lit), ExprKind::Lit(right_lit)) => left_lit.node == right_lit.node, + (ExprKind::Cast(left_expr, _), ExprKind::Cast(right_expr, _)) + => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), + (ExprKind::DropTemps(left), ExprKind::DropTemps(right)) => mirrored_exprs(cx, left, a_ident, right, b_ident), + (ExprKind::Block(left, _), ExprKind::Block(right, _)) => mirrored_blocks(cx, left, a_ident, right, b_ident), + (ExprKind::Field(left_expr, left_ident), ExprKind::Field(right_expr, right_ident)) + => left_ident.name == right_ident.name && mirrored_exprs(cx, left_expr, a_ident, right_expr, right_ident), + // The two exprs are `a` and `b`, directly + (ExprKind::Path(QPath::Resolved(_, Path { segments: &[PathSegment { ident: left_ident, .. }], .. },)), + ExprKind::Path(QPath::Resolved(_, Path { segments: &[PathSegment { ident: right_ident, .. }], .. },)), + ) => &left_ident == a_ident && &right_ident == b_ident, + // The two exprs are Paths to the same name (which is neither a nor b) + (ExprKind::Path(QPath::Resolved(_, Path { segments: left_segments, .. })), + ExprKind::Path(QPath::Resolved(_, Path { segments: right_segments, .. }))) + => left_segments.iter().zip(right_segments.iter()).all(|(left, right)| left.ident == right.ident) + && left_segments.iter().all(|seg| &seg.ident != a_ident && &seg.ident != b_ident), + // Matching expressions, but one or both is borrowed + (ExprKind::AddrOf(left_kind, Mutability::Not, left_expr), ExprKind::AddrOf(right_kind, Mutability::Not, right_expr)) + => left_kind == right_kind && mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), + (_, ExprKind::AddrOf(_, Mutability::Not, right_expr)) + => mirrored_exprs(cx, a_expr, a_ident, right_expr, b_ident), + (ExprKind::AddrOf(_, Mutability::Not, left_expr), _) + => mirrored_exprs(cx, left_expr, a_ident, b_expr, b_ident), + // _ => false, + (left, right) => { + println!("{:?}\n{:?}", left, right); + false + }, + } +} + +/// Detect if the two blocks are mirrored (identical, except one +/// contains a and the other replaces it with b) +fn mirrored_blocks(cx: &LateContext<'_, '_>, a_block: &Block<'_>, a_ident: &Ident, b_block: &Block<'_>, b_ident: &Ident) -> bool { + match (a_block, b_block) { + (Block { stmts: left_stmts, expr: left_expr, .. }, + Block { stmts: right_stmts, expr: right_expr, .. }) + => left_stmts.iter().zip(right_stmts.iter()).all(|(left, right)| match (&left.kind, &right.kind) { + (StmtKind::Expr(left_expr), StmtKind::Expr(right_expr)) => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), + (StmtKind::Semi(left_expr), StmtKind::Semi(right_expr)) => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), + (StmtKind::Item(left_item), StmtKind::Item(right_item)) => left_item.id == right_item.id, + (StmtKind::Local(left), StmtKind::Local(right)) => mirrored_locals(cx, left, a_ident, right, b_ident), + _ => false, + }) && match (left_expr, right_expr) { + (None, None) => true, + (Some(left), Some(right)) => mirrored_exprs(cx, left, a_ident, right, b_ident), + _ => false, + }, + } +} + +/// Check that the two "Local"s (let statements) are equal +fn mirrored_locals(cx: &LateContext<'_, '_>, a_local: &Local<'_>, a_ident: &Ident, b_local: &Local<'_>, b_ident: &Ident) -> bool { + match (a_local, b_local) { + (Local { pat: left_pat, init: left_expr, .. }, Local { pat: right_pat, init: right_expr, .. }) + => match (left_expr, right_expr) { + (None, None) => true, + (Some(left), Some(right)) => mirrored_exprs(cx, left, a_ident, right, b_ident), + _ => false, + }, + } +} + fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option { if_chain! { if let ExprKind::MethodCall(name_ident, _, args) = &expr.kind; if let name = name_ident.ident.name.to_ident_string(); if name == "sort_by" || name == "sort_unstable_by"; - if let [vec, Expr { kind: ExprKind::Closure(_, closure_decl, closure_body_id, _, _), .. }] = args; - if closure_decl.inputs.len() == 2; - if match_type(cx, &cx.tables.expr_ty(vec), &paths::VEC); + if let [vec, Expr { kind: ExprKind::Closure(_, _, closure_body_id, _, _), .. }] = args; + if utils::match_type(cx, &cx.tables.expr_ty(vec), &paths::VEC); + if let closure_body = cx.tcx.hir().body(*closure_body_id); + if let &[ + Param { pat: Pat { kind: PatKind::Binding(_, _, a_ident, _), .. }, ..}, + Param { pat: Pat { kind: PatKind::Binding(_, _, b_ident, _), .. }, .. } + ] = &closure_body.params; + if let ExprKind::MethodCall(method_path, _, [ref b_expr, ref a_expr]) = &closure_body.value.kind; + if method_path.ident.name.to_ident_string() == "cmp"; + if mirrored_exprs(&cx, &a_expr, &a_ident, &b_expr, &b_ident); then { let vec_name = Sugg::hir(cx, &args[0], "..").to_string(); let unstable = name == "sort_unstable_by"; - Some(LintTrigger { vec_name, unstable, closure_arg: "e".to_string(), closure_reverse_body: "e".to_string() }) + let closure_arg = a_ident.name.to_ident_string(); + let closure_reverse_body = Sugg::hir(cx, &a_expr, "..").to_string(); + Some(LintTrigger { vec_name, unstable, closure_arg, closure_reverse_body }) } else { None } @@ -60,18 +165,8 @@ fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option impl LateLintPass<'_, '_> for SortByKeyReverse { fn check_expr(&mut self, cx: &LateContext<'_, '_>, expr: &Expr<'_>) { - println!("{:?}", expr); - span_lint_and_sugg( - cx, - SORT_BY_KEY_REVERSE, - expr.span, - "use Vec::sort_by_key here instead", - "try", - String::from("being a better person"), - Applicability::MachineApplicable, - ); if let Some(trigger) = detect_lint(cx, expr) { - span_lint_and_sugg( + utils::span_lint_and_sugg( cx, SORT_BY_KEY_REVERSE, expr.span, diff --git a/tests/ui/sort_by_key_reverse.fixed b/tests/ui/sort_by_key_reverse.fixed index e69de29bb..4b18a073e 100644 --- a/tests/ui/sort_by_key_reverse.fixed +++ b/tests/ui/sort_by_key_reverse.fixed @@ -0,0 +1,9 @@ +// run-rustfix +#![warn(clippy::sort_by_key_reverse)] + +fn main() { + let mut vec: Vec = vec![3, 6, 1, 2, 5]; + vec.sort_by_key(|a| Reverse(a)); + vec.sort_by_key(|a| Reverse(&(a+5).abs())); + vec.sort_by_key(|a| Reverse(&-a)); +} diff --git a/tests/ui/sort_by_key_reverse.rs b/tests/ui/sort_by_key_reverse.rs index c0350f243..f4fb70b7b 100644 --- a/tests/ui/sort_by_key_reverse.rs +++ b/tests/ui/sort_by_key_reverse.rs @@ -1,6 +1,9 @@ +// run-rustfix #![warn(clippy::sort_by_key_reverse)] fn main() { - let mut vec = vec![3, 6, 1, 2, 5]; + let mut vec: Vec = vec![3, 6, 1, 2, 5]; vec.sort_by(|a, b| b.cmp(a)); + vec.sort_by(|a, b| (b + 5).abs().cmp(&(a+5).abs())); + vec.sort_by(|a, b| (-b).cmp(&-a)); } diff --git a/tests/ui/sort_by_key_reverse.stderr b/tests/ui/sort_by_key_reverse.stderr index e69de29bb..36a28c04b 100644 --- a/tests/ui/sort_by_key_reverse.stderr +++ b/tests/ui/sort_by_key_reverse.stderr @@ -0,0 +1,22 @@ +error: use Vec::sort_by_key here instead + --> $DIR/sort_by_key_reverse.rs:6:5 + | +LL | vec.sort_by(|a, b| b.cmp(a)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|a| Reverse(a))` + | + = note: `-D clippy::sort-by-key-reverse` implied by `-D warnings` + +error: use Vec::sort_by_key here instead + --> $DIR/sort_by_key_reverse.rs:7:5 + | +LL | vec.sort_by(|a, b| (b + 5).abs().cmp(&(a+5).abs())); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|a| Reverse(&(a+5).abs()))` + +error: use Vec::sort_by_key here instead + --> $DIR/sort_by_key_reverse.rs:8:5 + | +LL | vec.sort_by(|a, b| (-b).cmp(&-a)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|a| Reverse(&-a))` + +error: aborting due to 3 previous errors + From 943cb94dce8fca6f3a3f7f011a2a2f9f0a665b97 Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Tue, 19 May 2020 22:57:27 -0700 Subject: [PATCH 0148/4780] Passes all tests now! --- clippy_lints/src/sort_by_key_reverse.rs | 72 ++++++++----------------- tests/ui/sort_by_key_reverse.fixed | 12 +++-- tests/ui/sort_by_key_reverse.rs | 8 ++- tests/ui/sort_by_key_reverse.stderr | 14 ++--- 4 files changed, 45 insertions(+), 61 deletions(-) diff --git a/clippy_lints/src/sort_by_key_reverse.rs b/clippy_lints/src/sort_by_key_reverse.rs index d70391999..31629a1db 100644 --- a/clippy_lints/src/sort_by_key_reverse.rs +++ b/clippy_lints/src/sort_by_key_reverse.rs @@ -53,8 +53,12 @@ fn mirrored_exprs(cx: &LateContext<'_, '_>, a_expr: &Expr<'_>, a_ident: &Ident, // The two exprs are function calls. // Check to see that the function itself and its arguments are mirrored (ExprKind::Call(left_expr, left_args), ExprKind::Call(right_expr, right_args)) - => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident) - && left_args.iter().zip(right_args.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), + => { + // println!("{:?}\n{:?}\n", left_expr, left_args); + // println!("{:?}\n{:?}\n", right_expr, right_args); + mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident) + && left_args.iter().zip(right_args.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)) + }, // The two exprs are method calls. // Check to see that the function is the same and the arguments are mirrored // This is enough because the receiver of the method is listed in the arguments @@ -74,21 +78,17 @@ fn mirrored_exprs(cx: &LateContext<'_, '_>, a_expr: &Expr<'_>, a_ident: &Ident, => left_op == right_op && mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), // The two exprs are literals of some kind (ExprKind::Lit(left_lit), ExprKind::Lit(right_lit)) => left_lit.node == right_lit.node, - (ExprKind::Cast(left_expr, _), ExprKind::Cast(right_expr, _)) + (ExprKind::Cast(left_expr, left_ty), ExprKind::Cast(right_expr, right_ty)) => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), (ExprKind::DropTemps(left), ExprKind::DropTemps(right)) => mirrored_exprs(cx, left, a_ident, right, b_ident), - (ExprKind::Block(left, _), ExprKind::Block(right, _)) => mirrored_blocks(cx, left, a_ident, right, b_ident), (ExprKind::Field(left_expr, left_ident), ExprKind::Field(right_expr, right_ident)) => left_ident.name == right_ident.name && mirrored_exprs(cx, left_expr, a_ident, right_expr, right_ident), - // The two exprs are `a` and `b`, directly - (ExprKind::Path(QPath::Resolved(_, Path { segments: &[PathSegment { ident: left_ident, .. }], .. },)), - ExprKind::Path(QPath::Resolved(_, Path { segments: &[PathSegment { ident: right_ident, .. }], .. },)), - ) => &left_ident == a_ident && &right_ident == b_ident, - // The two exprs are Paths to the same name (which is neither a nor b) + // Two paths: either one is a and the other is b, or they're identical to each other (ExprKind::Path(QPath::Resolved(_, Path { segments: left_segments, .. })), ExprKind::Path(QPath::Resolved(_, Path { segments: right_segments, .. }))) - => left_segments.iter().zip(right_segments.iter()).all(|(left, right)| left.ident == right.ident) - && left_segments.iter().all(|seg| &seg.ident != a_ident && &seg.ident != b_ident), + => (left_segments.iter().zip(right_segments.iter()).all(|(left, right)| left.ident == right.ident) + && left_segments.iter().all(|seg| &seg.ident != a_ident && &seg.ident != b_ident)) + || (left_segments.len() == 1 && &left_segments[0].ident == a_ident && right_segments.len() == 1 && &right_segments[0].ident == b_ident), // Matching expressions, but one or both is borrowed (ExprKind::AddrOf(left_kind, Mutability::Not, left_expr), ExprKind::AddrOf(right_kind, Mutability::Not, right_expr)) => left_kind == right_kind && mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), @@ -96,43 +96,11 @@ fn mirrored_exprs(cx: &LateContext<'_, '_>, a_expr: &Expr<'_>, a_ident: &Ident, => mirrored_exprs(cx, a_expr, a_ident, right_expr, b_ident), (ExprKind::AddrOf(_, Mutability::Not, left_expr), _) => mirrored_exprs(cx, left_expr, a_ident, b_expr, b_ident), - // _ => false, - (left, right) => { - println!("{:?}\n{:?}", left, right); - false - }, - } -} - -/// Detect if the two blocks are mirrored (identical, except one -/// contains a and the other replaces it with b) -fn mirrored_blocks(cx: &LateContext<'_, '_>, a_block: &Block<'_>, a_ident: &Ident, b_block: &Block<'_>, b_ident: &Ident) -> bool { - match (a_block, b_block) { - (Block { stmts: left_stmts, expr: left_expr, .. }, - Block { stmts: right_stmts, expr: right_expr, .. }) - => left_stmts.iter().zip(right_stmts.iter()).all(|(left, right)| match (&left.kind, &right.kind) { - (StmtKind::Expr(left_expr), StmtKind::Expr(right_expr)) => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), - (StmtKind::Semi(left_expr), StmtKind::Semi(right_expr)) => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), - (StmtKind::Item(left_item), StmtKind::Item(right_item)) => left_item.id == right_item.id, - (StmtKind::Local(left), StmtKind::Local(right)) => mirrored_locals(cx, left, a_ident, right, b_ident), - _ => false, - }) && match (left_expr, right_expr) { - (None, None) => true, - (Some(left), Some(right)) => mirrored_exprs(cx, left, a_ident, right, b_ident), - _ => false, - }, - } -} - -/// Check that the two "Local"s (let statements) are equal -fn mirrored_locals(cx: &LateContext<'_, '_>, a_local: &Local<'_>, a_ident: &Ident, b_local: &Local<'_>, b_ident: &Ident) -> bool { - match (a_local, b_local) { - (Local { pat: left_pat, init: left_expr, .. }, Local { pat: right_pat, init: right_expr, .. }) - => match (left_expr, right_expr) { - (None, None) => true, - (Some(left), Some(right)) => mirrored_exprs(cx, left, a_ident, right, b_ident), - _ => false, - }, + _ => false, + // (left, right) => { + // println!("{:?}\n{:?}", left, right); + // false + // }, } } @@ -154,8 +122,12 @@ fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option then { let vec_name = Sugg::hir(cx, &args[0], "..").to_string(); let unstable = name == "sort_unstable_by"; - let closure_arg = a_ident.name.to_ident_string(); - let closure_reverse_body = Sugg::hir(cx, &a_expr, "..").to_string(); + let closure_arg = format!("&{}", b_ident.name.to_ident_string()); + let closure_reverse_body = Sugg::hir(cx, &b_expr, "..").to_string(); + // Get rid of parentheses, because they aren't needed anymore + // while closure_reverse_body.chars().next() == Some('(') && closure_reverse_body.chars().last() == Some(')') { + // closure_reverse_body = String::from(&closure_reverse_body[1..closure_reverse_body.len()-1]); + // } Some(LintTrigger { vec_name, unstable, closure_arg, closure_reverse_body }) } else { None diff --git a/tests/ui/sort_by_key_reverse.fixed b/tests/ui/sort_by_key_reverse.fixed index 4b18a073e..d536dc385 100644 --- a/tests/ui/sort_by_key_reverse.fixed +++ b/tests/ui/sort_by_key_reverse.fixed @@ -1,9 +1,15 @@ // run-rustfix #![warn(clippy::sort_by_key_reverse)] +use std::cmp::Reverse; + +fn id(x: isize) -> isize { + x +} + fn main() { let mut vec: Vec = vec![3, 6, 1, 2, 5]; - vec.sort_by_key(|a| Reverse(a)); - vec.sort_by_key(|a| Reverse(&(a+5).abs())); - vec.sort_by_key(|a| Reverse(&-a)); + vec.sort_by_key(|&b| Reverse(b)); + vec.sort_by_key(|&b| Reverse((b + 5).abs())); + vec.sort_by_key(|&b| Reverse(id(-b))); } diff --git a/tests/ui/sort_by_key_reverse.rs b/tests/ui/sort_by_key_reverse.rs index f4fb70b7b..9c42d4017 100644 --- a/tests/ui/sort_by_key_reverse.rs +++ b/tests/ui/sort_by_key_reverse.rs @@ -1,9 +1,15 @@ // run-rustfix #![warn(clippy::sort_by_key_reverse)] +use std::cmp::Reverse; + +fn id(x: isize) -> isize { + x +} + fn main() { let mut vec: Vec = vec![3, 6, 1, 2, 5]; vec.sort_by(|a, b| b.cmp(a)); vec.sort_by(|a, b| (b + 5).abs().cmp(&(a+5).abs())); - vec.sort_by(|a, b| (-b).cmp(&-a)); + vec.sort_by(|a, b| id(-b).cmp(&id(-a))); } diff --git a/tests/ui/sort_by_key_reverse.stderr b/tests/ui/sort_by_key_reverse.stderr index 36a28c04b..3d26ddae7 100644 --- a/tests/ui/sort_by_key_reverse.stderr +++ b/tests/ui/sort_by_key_reverse.stderr @@ -1,22 +1,22 @@ error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key_reverse.rs:6:5 + --> $DIR/sort_by_key_reverse.rs:12:5 | LL | vec.sort_by(|a, b| b.cmp(a)); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|a| Reverse(a))` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(b))` | = note: `-D clippy::sort-by-key-reverse` implied by `-D warnings` error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key_reverse.rs:7:5 + --> $DIR/sort_by_key_reverse.rs:13:5 | LL | vec.sort_by(|a, b| (b + 5).abs().cmp(&(a+5).abs())); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|a| Reverse(&(a+5).abs()))` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse((b + 5).abs()))` error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key_reverse.rs:8:5 + --> $DIR/sort_by_key_reverse.rs:14:5 | -LL | vec.sort_by(|a, b| (-b).cmp(&-a)); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|a| Reverse(&-a))` +LL | vec.sort_by(|a, b| id(-b).cmp(&id(-a))); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(id(-b)))` error: aborting due to 3 previous errors From 955a25ee7db234a8ab697176a433070702aabe59 Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Wed, 20 May 2020 09:23:00 -0700 Subject: [PATCH 0149/4780] Added negative test cases and ran cargo dev fmt --- clippy_lints/src/sort_by_key_reverse.rs | 125 ++++++++++++++++-------- tests/ui/sort_by_key_reverse.fixed | 7 ++ tests/ui/sort_by_key_reverse.rs | 9 +- tests/ui/sort_by_key_reverse.stderr | 4 +- 4 files changed, 100 insertions(+), 45 deletions(-) diff --git a/clippy_lints/src/sort_by_key_reverse.rs b/clippy_lints/src/sort_by_key_reverse.rs index 31629a1db..ea850955d 100644 --- a/clippy_lints/src/sort_by_key_reverse.rs +++ b/clippy_lints/src/sort_by_key_reverse.rs @@ -3,7 +3,7 @@ use crate::utils::paths; use crate::utils::sugg::Sugg; use if_chain::if_chain; use rustc_errors::Applicability; -use rustc_hir::*; +use rustc_hir::{Expr, ExprKind, Mutability, Param, Pat, PatKind, Path, QPath}; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::symbol::Ident; @@ -43,64 +43,105 @@ struct LintTrigger { /// Detect if the two expressions are mirrored (identical, except one /// contains a and the other replaces it with b) -fn mirrored_exprs(cx: &LateContext<'_, '_>, a_expr: &Expr<'_>, a_ident: &Ident, b_expr: &Expr<'_>, b_ident: &Ident) -> bool { +fn mirrored_exprs( + cx: &LateContext<'_, '_>, + a_expr: &Expr<'_>, + a_ident: &Ident, + b_expr: &Expr<'_>, + b_ident: &Ident, +) -> bool { match (&a_expr.kind, &b_expr.kind) { // Two boxes with mirrored contents - (ExprKind::Box(left_expr), ExprKind::Box(right_expr)) => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), + (ExprKind::Box(left_expr), ExprKind::Box(right_expr)) => { + mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident) + }, // Two arrays with mirrored contents - (ExprKind::Array(left_exprs), ExprKind::Array(right_exprs)) - => left_exprs.iter().zip(right_exprs.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), + (ExprKind::Array(left_exprs), ExprKind::Array(right_exprs)) => left_exprs + .iter() + .zip(right_exprs.iter()) + .all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), // The two exprs are function calls. // Check to see that the function itself and its arguments are mirrored - (ExprKind::Call(left_expr, left_args), ExprKind::Call(right_expr, right_args)) - => { - // println!("{:?}\n{:?}\n", left_expr, left_args); - // println!("{:?}\n{:?}\n", right_expr, right_args); - mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident) - && left_args.iter().zip(right_args.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)) - }, + (ExprKind::Call(left_expr, left_args), ExprKind::Call(right_expr, right_args)) => { + mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident) + && left_args + .iter() + .zip(right_args.iter()) + .all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)) + }, // The two exprs are method calls. // Check to see that the function is the same and the arguments are mirrored // This is enough because the receiver of the method is listed in the arguments - (ExprKind::MethodCall(left_segment, _, left_args), ExprKind::MethodCall(right_segment, _, right_args)) - => left_segment.ident == right_segment.ident - && left_args.iter().zip(right_args.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), + (ExprKind::MethodCall(left_segment, _, left_args), ExprKind::MethodCall(right_segment, _, right_args)) => { + left_segment.ident == right_segment.ident + && left_args + .iter() + .zip(right_args.iter()) + .all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)) + }, // Two tuples with mirrored contents - (ExprKind::Tup(left_exprs), ExprKind::Tup(right_exprs)) - => left_exprs.iter().zip(right_exprs.iter()).all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), + (ExprKind::Tup(left_exprs), ExprKind::Tup(right_exprs)) => left_exprs + .iter() + .zip(right_exprs.iter()) + .all(|(left, right)| mirrored_exprs(cx, left, a_ident, right, b_ident)), // Two binary ops, which are the same operation and which have mirrored arguments - (ExprKind::Binary(left_op, left_left, left_right), ExprKind::Binary(right_op, right_left, right_right)) - => left_op.node == right_op.node + (ExprKind::Binary(left_op, left_left, left_right), ExprKind::Binary(right_op, right_left, right_right)) => { + left_op.node == right_op.node && mirrored_exprs(cx, left_left, a_ident, right_left, b_ident) - && mirrored_exprs(cx, left_right, a_ident, right_right, b_ident), + && mirrored_exprs(cx, left_right, a_ident, right_right, b_ident) + }, // Two unary ops, which are the same operation and which have the same argument - (ExprKind::Unary(left_op, left_expr), ExprKind::Unary(right_op, right_expr)) - => left_op == right_op && mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), + (ExprKind::Unary(left_op, left_expr), ExprKind::Unary(right_op, right_expr)) => { + left_op == right_op && mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident) + }, // The two exprs are literals of some kind (ExprKind::Lit(left_lit), ExprKind::Lit(right_lit)) => left_lit.node == right_lit.node, - (ExprKind::Cast(left_expr, left_ty), ExprKind::Cast(right_expr, right_ty)) - => mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), - (ExprKind::DropTemps(left), ExprKind::DropTemps(right)) => mirrored_exprs(cx, left, a_ident, right, b_ident), - (ExprKind::Field(left_expr, left_ident), ExprKind::Field(right_expr, right_ident)) - => left_ident.name == right_ident.name && mirrored_exprs(cx, left_expr, a_ident, right_expr, right_ident), + (ExprKind::Cast(left, _), ExprKind::Cast(right, _)) => mirrored_exprs(cx, left, a_ident, right, b_ident), + (ExprKind::DropTemps(left_block), ExprKind::DropTemps(right_block)) => { + mirrored_exprs(cx, left_block, a_ident, right_block, b_ident) + }, + (ExprKind::Field(left_expr, left_ident), ExprKind::Field(right_expr, right_ident)) => { + left_ident.name == right_ident.name && mirrored_exprs(cx, left_expr, a_ident, right_expr, right_ident) + }, // Two paths: either one is a and the other is b, or they're identical to each other - (ExprKind::Path(QPath::Resolved(_, Path { segments: left_segments, .. })), - ExprKind::Path(QPath::Resolved(_, Path { segments: right_segments, .. }))) - => (left_segments.iter().zip(right_segments.iter()).all(|(left, right)| left.ident == right.ident) - && left_segments.iter().all(|seg| &seg.ident != a_ident && &seg.ident != b_ident)) - || (left_segments.len() == 1 && &left_segments[0].ident == a_ident && right_segments.len() == 1 && &right_segments[0].ident == b_ident), + ( + ExprKind::Path(QPath::Resolved( + _, + Path { + segments: left_segments, + .. + }, + )), + ExprKind::Path(QPath::Resolved( + _, + Path { + segments: right_segments, + .. + }, + )), + ) => { + (left_segments + .iter() + .zip(right_segments.iter()) + .all(|(left, right)| left.ident == right.ident) + && left_segments + .iter() + .all(|seg| &seg.ident != a_ident && &seg.ident != b_ident)) + || (left_segments.len() == 1 + && &left_segments[0].ident == a_ident + && right_segments.len() == 1 + && &right_segments[0].ident == b_ident) + }, // Matching expressions, but one or both is borrowed - (ExprKind::AddrOf(left_kind, Mutability::Not, left_expr), ExprKind::AddrOf(right_kind, Mutability::Not, right_expr)) - => left_kind == right_kind && mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), - (_, ExprKind::AddrOf(_, Mutability::Not, right_expr)) - => mirrored_exprs(cx, a_expr, a_ident, right_expr, b_ident), - (ExprKind::AddrOf(_, Mutability::Not, left_expr), _) - => mirrored_exprs(cx, left_expr, a_ident, b_expr, b_ident), + ( + ExprKind::AddrOf(left_kind, Mutability::Not, left_expr), + ExprKind::AddrOf(right_kind, Mutability::Not, right_expr), + ) => left_kind == right_kind && mirrored_exprs(cx, left_expr, a_ident, right_expr, b_ident), + (_, ExprKind::AddrOf(_, Mutability::Not, right_expr)) => { + mirrored_exprs(cx, a_expr, a_ident, right_expr, b_ident) + }, + (ExprKind::AddrOf(_, Mutability::Not, left_expr), _) => mirrored_exprs(cx, left_expr, a_ident, b_expr, b_ident), _ => false, - // (left, right) => { - // println!("{:?}\n{:?}", left, right); - // false - // }, } } diff --git a/tests/ui/sort_by_key_reverse.fixed b/tests/ui/sort_by_key_reverse.fixed index d536dc385..722675a6b 100644 --- a/tests/ui/sort_by_key_reverse.fixed +++ b/tests/ui/sort_by_key_reverse.fixed @@ -12,4 +12,11 @@ fn main() { vec.sort_by_key(|&b| Reverse(b)); vec.sort_by_key(|&b| Reverse((b + 5).abs())); vec.sort_by_key(|&b| Reverse(id(-b))); + // Negative examples (shouldn't be changed) + let c = &7; + vec.sort_by(|a, b| (b - a).cmp(&(a - b))); + vec.sort_by(|_, b| b.cmp(&5)); + vec.sort_by(|_, b| b.cmp(c)); + vec.sort_by(|a, _| a.cmp(c)); + vec.sort_by(|a, b| a.cmp(b)); } diff --git a/tests/ui/sort_by_key_reverse.rs b/tests/ui/sort_by_key_reverse.rs index 9c42d4017..601621ffa 100644 --- a/tests/ui/sort_by_key_reverse.rs +++ b/tests/ui/sort_by_key_reverse.rs @@ -10,6 +10,13 @@ fn id(x: isize) -> isize { fn main() { let mut vec: Vec = vec![3, 6, 1, 2, 5]; vec.sort_by(|a, b| b.cmp(a)); - vec.sort_by(|a, b| (b + 5).abs().cmp(&(a+5).abs())); + vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs())); vec.sort_by(|a, b| id(-b).cmp(&id(-a))); + // Negative examples (shouldn't be changed) + let c = &7; + vec.sort_by(|a, b| (b - a).cmp(&(a - b))); + vec.sort_by(|_, b| b.cmp(&5)); + vec.sort_by(|_, b| b.cmp(c)); + vec.sort_by(|a, _| a.cmp(c)); + vec.sort_by(|a, b| a.cmp(b)); } diff --git a/tests/ui/sort_by_key_reverse.stderr b/tests/ui/sort_by_key_reverse.stderr index 3d26ddae7..b757c8a61 100644 --- a/tests/ui/sort_by_key_reverse.stderr +++ b/tests/ui/sort_by_key_reverse.stderr @@ -9,8 +9,8 @@ LL | vec.sort_by(|a, b| b.cmp(a)); error: use Vec::sort_by_key here instead --> $DIR/sort_by_key_reverse.rs:13:5 | -LL | vec.sort_by(|a, b| (b + 5).abs().cmp(&(a+5).abs())); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse((b + 5).abs()))` +LL | vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs())); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse((b + 5).abs()))` error: use Vec::sort_by_key here instead --> $DIR/sort_by_key_reverse.rs:14:5 From 059e8edd15401d5544260e4058731dc8818578d5 Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Sun, 24 May 2020 19:45:41 -0700 Subject: [PATCH 0150/4780] Detect also a non-reversed comparison --- clippy_lints/src/lib.rs | 10 ++-- ...{sort_by_key_reverse.rs => sort_by_key.rs} | 52 +++++++++++-------- ...by_key_reverse.fixed => sort_by_key.fixed} | 8 ++- ...{sort_by_key_reverse.rs => sort_by_key.rs} | 6 ++- tests/ui/sort_by_key.stderr | 48 +++++++++++++++++ tests/ui/sort_by_key_reverse.stderr | 22 -------- 6 files changed, 94 insertions(+), 52 deletions(-) rename clippy_lints/src/{sort_by_key_reverse.rs => sort_by_key.rs} (83%) rename tests/ui/{sort_by_key_reverse.fixed => sort_by_key.fixed} (72%) rename tests/ui/{sort_by_key_reverse.rs => sort_by_key.rs} (78%) create mode 100644 tests/ui/sort_by_key.stderr delete mode 100644 tests/ui/sort_by_key_reverse.stderr diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index e7a4c1eca..9e826316f 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -304,7 +304,7 @@ mod serde_api; mod shadow; mod single_component_path_imports; mod slow_vector_initialization; -mod sort_by_key_reverse; +mod sort_by_key; mod strings; mod suspicious_trait_impl; mod swap; @@ -780,7 +780,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &shadow::SHADOW_UNRELATED, &single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS, &slow_vector_initialization::SLOW_VECTOR_INITIALIZATION, - &sort_by_key_reverse::SORT_BY_KEY_REVERSE, + &sort_by_key::SORT_BY_KEY, &strings::STRING_ADD, &strings::STRING_ADD_ASSIGN, &strings::STRING_LIT_AS_BYTES, @@ -998,7 +998,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box ptr_offset_with_cast::PtrOffsetWithCast); store.register_late_pass(|| box redundant_clone::RedundantClone); store.register_late_pass(|| box slow_vector_initialization::SlowVectorInit); - store.register_late_pass(|| box sort_by_key_reverse::SortByKeyReverse); + store.register_late_pass(|| box sort_by_key::SortByKey); store.register_late_pass(|| box types::RefToMut); store.register_late_pass(|| box assertions_on_constants::AssertionsOnConstants); store.register_late_pass(|| box missing_const_for_fn::MissingConstForFn); @@ -1394,7 +1394,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&serde_api::SERDE_API_MISUSE), LintId::of(&single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS), LintId::of(&slow_vector_initialization::SLOW_VECTOR_INITIALIZATION), - LintId::of(&sort_by_key_reverse::SORT_BY_KEY_REVERSE), + LintId::of(&sort_by_key::SORT_BY_KEY), LintId::of(&strings::STRING_LIT_AS_BYTES), LintId::of(&suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL), LintId::of(&suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL), @@ -1596,7 +1596,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&ranges::RANGE_ZIP_WITH_LEN), LintId::of(&reference::DEREF_ADDROF), LintId::of(&reference::REF_IN_DEREF), - LintId::of(&sort_by_key_reverse::SORT_BY_KEY_REVERSE), + LintId::of(&sort_by_key::SORT_BY_KEY), LintId::of(&swap::MANUAL_SWAP), LintId::of(&temporary_assignment::TEMPORARY_ASSIGNMENT), LintId::of(&transmute::CROSSPOINTER_TRANSMUTE), diff --git a/clippy_lints/src/sort_by_key_reverse.rs b/clippy_lints/src/sort_by_key.rs similarity index 83% rename from clippy_lints/src/sort_by_key_reverse.rs rename to clippy_lints/src/sort_by_key.rs index ea850955d..109845a28 100644 --- a/clippy_lints/src/sort_by_key_reverse.rs +++ b/clippy_lints/src/sort_by_key.rs @@ -11,33 +11,35 @@ use rustc_span::symbol::Ident; declare_clippy_lint! { /// **What it does:** /// Detects when people use `Vec::sort_by` and pass in a function - /// which compares the second argument to the first. + /// which compares the two arguments, either directly or indirectly. /// /// **Why is this bad?** - /// It is more clear to use `Vec::sort_by_key` and `std::cmp::Reverse` + /// It is more clear to use `Vec::sort_by_key` (or + /// `Vec::sort_by_key` and `std::cmp::Reverse` if necessary) than + /// using /// /// **Known problems:** None. /// /// **Example:** /// /// ```rust - /// vec.sort_by(|a, b| b.foo().cmp(&a.foo())); + /// vec.sort_by(|a, b| a.foo().cmp(b.foo())); /// ``` /// Use instead: /// ```rust - /// vec.sort_by_key(|e| Reverse(e.foo())); + /// vec.sort_by_key(|a| a.foo()); /// ``` - pub SORT_BY_KEY_REVERSE, + pub SORT_BY_KEY, complexity, "Use of `Vec::sort_by` when `Vec::sort_by_key` would be clearer" } -declare_lint_pass!(SortByKeyReverse => [SORT_BY_KEY_REVERSE]); +declare_lint_pass!(SortByKey => [SORT_BY_KEY]); struct LintTrigger { vec_name: String, closure_arg: String, - closure_reverse_body: String, + closure_body: String, unstable: bool, } @@ -154,43 +156,49 @@ fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option if utils::match_type(cx, &cx.tables.expr_ty(vec), &paths::VEC); if let closure_body = cx.tcx.hir().body(*closure_body_id); if let &[ - Param { pat: Pat { kind: PatKind::Binding(_, _, a_ident, _), .. }, ..}, - Param { pat: Pat { kind: PatKind::Binding(_, _, b_ident, _), .. }, .. } + Param { pat: Pat { kind: PatKind::Binding(_, _, left_ident, _), .. }, ..}, + Param { pat: Pat { kind: PatKind::Binding(_, _, right_ident, _), .. }, .. } ] = &closure_body.params; - if let ExprKind::MethodCall(method_path, _, [ref b_expr, ref a_expr]) = &closure_body.value.kind; + if let ExprKind::MethodCall(method_path, _, [ref left_expr, ref right_expr]) = &closure_body.value.kind; if method_path.ident.name.to_ident_string() == "cmp"; - if mirrored_exprs(&cx, &a_expr, &a_ident, &b_expr, &b_ident); then { + let (closure_body, closure_arg) = if mirrored_exprs( + &cx, + &left_expr, + &left_ident, + &right_expr, + &right_ident + ) { + (Sugg::hir(cx, &left_expr, "..").to_string(), left_ident.name.to_string()) + } else if mirrored_exprs(&cx, &left_expr, &right_ident, &right_expr, &left_ident) { + (format!("Reverse({})", Sugg::hir(cx, &left_expr, "..").to_string()), right_ident.name.to_string()) + } else { + return None; + }; let vec_name = Sugg::hir(cx, &args[0], "..").to_string(); let unstable = name == "sort_unstable_by"; - let closure_arg = format!("&{}", b_ident.name.to_ident_string()); - let closure_reverse_body = Sugg::hir(cx, &b_expr, "..").to_string(); - // Get rid of parentheses, because they aren't needed anymore - // while closure_reverse_body.chars().next() == Some('(') && closure_reverse_body.chars().last() == Some(')') { - // closure_reverse_body = String::from(&closure_reverse_body[1..closure_reverse_body.len()-1]); - // } - Some(LintTrigger { vec_name, unstable, closure_arg, closure_reverse_body }) + Some(LintTrigger { vec_name, unstable, closure_arg, closure_body }) } else { None } } } -impl LateLintPass<'_, '_> for SortByKeyReverse { +impl LateLintPass<'_, '_> for SortByKey { fn check_expr(&mut self, cx: &LateContext<'_, '_>, expr: &Expr<'_>) { if let Some(trigger) = detect_lint(cx, expr) { utils::span_lint_and_sugg( cx, - SORT_BY_KEY_REVERSE, + SORT_BY_KEY, expr.span, "use Vec::sort_by_key here instead", "try", format!( - "{}.sort{}_by_key(|{}| Reverse({}))", + "{}.sort{}_by_key(|&{}| {})", trigger.vec_name, if trigger.unstable { "_unstable" } else { "" }, trigger.closure_arg, - trigger.closure_reverse_body, + trigger.closure_body, ), Applicability::MachineApplicable, ); diff --git a/tests/ui/sort_by_key_reverse.fixed b/tests/ui/sort_by_key.fixed similarity index 72% rename from tests/ui/sort_by_key_reverse.fixed rename to tests/ui/sort_by_key.fixed index 722675a6b..f6535c8d8 100644 --- a/tests/ui/sort_by_key_reverse.fixed +++ b/tests/ui/sort_by_key.fixed @@ -1,5 +1,5 @@ // run-rustfix -#![warn(clippy::sort_by_key_reverse)] +#![warn(clippy::sort_by_key)] use std::cmp::Reverse; @@ -9,6 +9,11 @@ fn id(x: isize) -> isize { fn main() { let mut vec: Vec = vec![3, 6, 1, 2, 5]; + // Forward examples + vec.sort_by_key(|&a| a); + vec.sort_by_key(|&a| (a + 5).abs()); + vec.sort_by_key(|&a| id(-a)); + // Reverse examples vec.sort_by_key(|&b| Reverse(b)); vec.sort_by_key(|&b| Reverse((b + 5).abs())); vec.sort_by_key(|&b| Reverse(id(-b))); @@ -18,5 +23,4 @@ fn main() { vec.sort_by(|_, b| b.cmp(&5)); vec.sort_by(|_, b| b.cmp(c)); vec.sort_by(|a, _| a.cmp(c)); - vec.sort_by(|a, b| a.cmp(b)); } diff --git a/tests/ui/sort_by_key_reverse.rs b/tests/ui/sort_by_key.rs similarity index 78% rename from tests/ui/sort_by_key_reverse.rs rename to tests/ui/sort_by_key.rs index 601621ffa..953c573d4 100644 --- a/tests/ui/sort_by_key_reverse.rs +++ b/tests/ui/sort_by_key.rs @@ -9,6 +9,11 @@ fn id(x: isize) -> isize { fn main() { let mut vec: Vec = vec![3, 6, 1, 2, 5]; + // Forward examples + vec.sort_by(|a, b| a.cmp(b)); + vec.sort_by(|a, b| (a + 5).abs().cmp(&(b + 5).abs())); + vec.sort_by(|a, b| id(-a).cmp(&id(-b))); + // Reverse examples vec.sort_by(|a, b| b.cmp(a)); vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs())); vec.sort_by(|a, b| id(-b).cmp(&id(-a))); @@ -18,5 +23,4 @@ fn main() { vec.sort_by(|_, b| b.cmp(&5)); vec.sort_by(|_, b| b.cmp(c)); vec.sort_by(|a, _| a.cmp(c)); - vec.sort_by(|a, b| a.cmp(b)); } diff --git a/tests/ui/sort_by_key.stderr b/tests/ui/sort_by_key.stderr new file mode 100644 index 000000000..fa6a9a0fb --- /dev/null +++ b/tests/ui/sort_by_key.stderr @@ -0,0 +1,48 @@ +error: use Vec::sort_by_key here instead + --> $DIR/sort_by_key.rs:13:5 + | +LL | vec.sort_by(|a, b| a.cmp(b)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| a)` + | + = note: `-D clippy::sort-by-key` implied by `-D warnings` + +error: use Vec::sort_by_key here instead + --> $DIR/sort_by_key.rs:14:5 + | +LL | vec.sort_by(|a, b| (a + 5).abs().cmp(&(b + 5).abs())); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| (a + 5).abs())` + +error: use Vec::sort_by_key here instead + --> $DIR/sort_by_key.rs:15:5 + | +LL | vec.sort_by(|a, b| id(-a).cmp(&id(-b))); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| id(-a))` + +error: use Vec::sort_by_key here instead + --> $DIR/sort_by_key.rs:17:5 + | +LL | vec.sort_by(|a, b| b.cmp(a)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(b))` + +error: use Vec::sort_by_key here instead + --> $DIR/sort_by_key.rs:18:5 + | +LL | vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs())); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse((b + 5).abs()))` + +error: use Vec::sort_by_key here instead + --> $DIR/sort_by_key.rs:19:5 + | +LL | vec.sort_by(|a, b| id(-b).cmp(&id(-a))); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(id(-b)))` + +error: unknown clippy lint: clippy::sort_by_key_reverse + --> $DIR/sort_by_key.rs:2:9 + | +LL | #![warn(clippy::sort_by_key_reverse)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: did you mean: `clippy::sort_by_key` + | + = note: `-D clippy::unknown-clippy-lints` implied by `-D warnings` + +error: aborting due to 7 previous errors + diff --git a/tests/ui/sort_by_key_reverse.stderr b/tests/ui/sort_by_key_reverse.stderr deleted file mode 100644 index b757c8a61..000000000 --- a/tests/ui/sort_by_key_reverse.stderr +++ /dev/null @@ -1,22 +0,0 @@ -error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key_reverse.rs:12:5 - | -LL | vec.sort_by(|a, b| b.cmp(a)); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(b))` - | - = note: `-D clippy::sort-by-key-reverse` implied by `-D warnings` - -error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key_reverse.rs:13:5 - | -LL | vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs())); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse((b + 5).abs()))` - -error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key_reverse.rs:14:5 - | -LL | vec.sort_by(|a, b| id(-b).cmp(&id(-a))); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(id(-b)))` - -error: aborting due to 3 previous errors - From 07886a97640b89f72b70805f519bd9d42d7d1c4e Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Sun, 24 May 2020 20:05:58 -0700 Subject: [PATCH 0151/4780] Detect also when works --- clippy_lints/src/sort_by_key.rs | 49 ++++++++++++++++++++++++++++----- tests/ui/sort_by_key.fixed | 2 +- tests/ui/sort_by_key.stderr | 4 +-- 3 files changed, 45 insertions(+), 10 deletions(-) diff --git a/clippy_lints/src/sort_by_key.rs b/clippy_lints/src/sort_by_key.rs index 109845a28..f720d1447 100644 --- a/clippy_lints/src/sort_by_key.rs +++ b/clippy_lints/src/sort_by_key.rs @@ -3,7 +3,7 @@ use crate::utils::paths; use crate::utils::sugg::Sugg; use if_chain::if_chain; use rustc_errors::Applicability; -use rustc_hir::{Expr, ExprKind, Mutability, Param, Pat, PatKind, Path, QPath}; +use rustc_hir::{Expr, ExprKind, Mutability, Param, Pat, PatKind, Path, PathSegment, QPath}; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::symbol::Ident; @@ -16,7 +16,7 @@ declare_clippy_lint! { /// **Why is this bad?** /// It is more clear to use `Vec::sort_by_key` (or /// `Vec::sort_by_key` and `std::cmp::Reverse` if necessary) than - /// using + /// using /// /// **Known problems:** None. /// @@ -36,7 +36,17 @@ declare_clippy_lint! { declare_lint_pass!(SortByKey => [SORT_BY_KEY]); -struct LintTrigger { +enum LintTrigger { + Sort(SortDetection), + SortByKey(SortByKeyDetection), +} + +struct SortDetection { + vec_name: String, + unstable: bool, +} + +struct SortByKeyDetection { vec_name: String, closure_arg: String, closure_body: String, @@ -177,7 +187,18 @@ fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option }; let vec_name = Sugg::hir(cx, &args[0], "..").to_string(); let unstable = name == "sort_unstable_by"; - Some(LintTrigger { vec_name, unstable, closure_arg, closure_body }) + if_chain! { + if let ExprKind::Path(QPath::Resolved(_, Path { + segments: [PathSegment { ident: left_name, .. }], .. + })) = &left_expr.kind; + if left_name == left_ident; + then { + Some(LintTrigger::Sort(SortDetection { vec_name, unstable })) + } + else { + Some(LintTrigger::SortByKey(SortByKeyDetection { vec_name, unstable, closure_arg, closure_body })) + } + } } else { None } @@ -186,8 +207,8 @@ fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option impl LateLintPass<'_, '_> for SortByKey { fn check_expr(&mut self, cx: &LateContext<'_, '_>, expr: &Expr<'_>) { - if let Some(trigger) = detect_lint(cx, expr) { - utils::span_lint_and_sugg( + match detect_lint(cx, expr) { + Some(LintTrigger::SortByKey(trigger)) => utils::span_lint_and_sugg( cx, SORT_BY_KEY, expr.span, @@ -201,7 +222,21 @@ impl LateLintPass<'_, '_> for SortByKey { trigger.closure_body, ), Applicability::MachineApplicable, - ); + ), + Some(LintTrigger::Sort(trigger)) => utils::span_lint_and_sugg( + cx, + SORT_BY_KEY, + expr.span, + "use Vec::sort here instead", + "try", + format!( + "{}.sort{}()", + trigger.vec_name, + if trigger.unstable { "_unstable" } else { "" }, + ), + Applicability::MachineApplicable, + ), + None => {}, } } } diff --git a/tests/ui/sort_by_key.fixed b/tests/ui/sort_by_key.fixed index f6535c8d8..bb88df1a5 100644 --- a/tests/ui/sort_by_key.fixed +++ b/tests/ui/sort_by_key.fixed @@ -10,7 +10,7 @@ fn id(x: isize) -> isize { fn main() { let mut vec: Vec = vec![3, 6, 1, 2, 5]; // Forward examples - vec.sort_by_key(|&a| a); + vec.sort(); vec.sort_by_key(|&a| (a + 5).abs()); vec.sort_by_key(|&a| id(-a)); // Reverse examples diff --git a/tests/ui/sort_by_key.stderr b/tests/ui/sort_by_key.stderr index fa6a9a0fb..291fd5500 100644 --- a/tests/ui/sort_by_key.stderr +++ b/tests/ui/sort_by_key.stderr @@ -1,8 +1,8 @@ -error: use Vec::sort_by_key here instead +error: use Vec::sort here instead --> $DIR/sort_by_key.rs:13:5 | LL | vec.sort_by(|a, b| a.cmp(b)); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| a)` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort()` | = note: `-D clippy::sort-by-key` implied by `-D warnings` From 015ab9f9259d58a48c171276f6e7190528f1a9ad Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Thu, 28 May 2020 18:18:25 -0700 Subject: [PATCH 0152/4780] Renamed to --- clippy_lints/src/lib.rs | 10 +++++----- .../{sort_by_key.rs => unnecessary_sort_by.rs} | 18 +++++++++--------- ..._by_key.fixed => unnecessary_sort_by.fixed} | 0 .../{sort_by_key.rs => unnecessary_sort_by.rs} | 0 ...y_key.stderr => unnecessary_sort_by.stderr} | 0 5 files changed, 14 insertions(+), 14 deletions(-) rename clippy_lints/src/{sort_by_key.rs => unnecessary_sort_by.rs} (95%) rename tests/ui/{sort_by_key.fixed => unnecessary_sort_by.fixed} (100%) rename tests/ui/{sort_by_key.rs => unnecessary_sort_by.rs} (100%) rename tests/ui/{sort_by_key.stderr => unnecessary_sort_by.stderr} (100%) diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 9e826316f..46df743b5 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -304,7 +304,7 @@ mod serde_api; mod shadow; mod single_component_path_imports; mod slow_vector_initialization; -mod sort_by_key; +mod unnecessary_sort_by; mod strings; mod suspicious_trait_impl; mod swap; @@ -780,7 +780,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &shadow::SHADOW_UNRELATED, &single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS, &slow_vector_initialization::SLOW_VECTOR_INITIALIZATION, - &sort_by_key::SORT_BY_KEY, + &unnecessary_sort_by::UNNECESSARY_SORT_BY, &strings::STRING_ADD, &strings::STRING_ADD_ASSIGN, &strings::STRING_LIT_AS_BYTES, @@ -998,7 +998,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box ptr_offset_with_cast::PtrOffsetWithCast); store.register_late_pass(|| box redundant_clone::RedundantClone); store.register_late_pass(|| box slow_vector_initialization::SlowVectorInit); - store.register_late_pass(|| box sort_by_key::SortByKey); + store.register_late_pass(|| box unnecessary_sort_by::UnnecessarySortBy); store.register_late_pass(|| box types::RefToMut); store.register_late_pass(|| box assertions_on_constants::AssertionsOnConstants); store.register_late_pass(|| box missing_const_for_fn::MissingConstForFn); @@ -1394,7 +1394,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&serde_api::SERDE_API_MISUSE), LintId::of(&single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS), LintId::of(&slow_vector_initialization::SLOW_VECTOR_INITIALIZATION), - LintId::of(&sort_by_key::SORT_BY_KEY), + LintId::of(&unnecessary_sort_by::UNNECESSARY_SORT_BY), LintId::of(&strings::STRING_LIT_AS_BYTES), LintId::of(&suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL), LintId::of(&suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL), @@ -1596,7 +1596,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&ranges::RANGE_ZIP_WITH_LEN), LintId::of(&reference::DEREF_ADDROF), LintId::of(&reference::REF_IN_DEREF), - LintId::of(&sort_by_key::SORT_BY_KEY), + LintId::of(&unnecessary_sort_by::UNNECESSARY_SORT_BY), LintId::of(&swap::MANUAL_SWAP), LintId::of(&temporary_assignment::TEMPORARY_ASSIGNMENT), LintId::of(&transmute::CROSSPOINTER_TRANSMUTE), diff --git a/clippy_lints/src/sort_by_key.rs b/clippy_lints/src/unnecessary_sort_by.rs similarity index 95% rename from clippy_lints/src/sort_by_key.rs rename to clippy_lints/src/unnecessary_sort_by.rs index f720d1447..c0858ec4c 100644 --- a/clippy_lints/src/sort_by_key.rs +++ b/clippy_lints/src/unnecessary_sort_by.rs @@ -14,9 +14,9 @@ declare_clippy_lint! { /// which compares the two arguments, either directly or indirectly. /// /// **Why is this bad?** - /// It is more clear to use `Vec::sort_by_key` (or - /// `Vec::sort_by_key` and `std::cmp::Reverse` if necessary) than - /// using + /// It is more clear to use `Vec::sort_by_key` (or `Vec::sort` if + /// possible) than to use `Vec::sort_by` and and a more complicated + /// closure. /// /// **Known problems:** None. /// @@ -29,12 +29,12 @@ declare_clippy_lint! { /// ```rust /// vec.sort_by_key(|a| a.foo()); /// ``` - pub SORT_BY_KEY, + pub UNNECESSARY_SORT_BY, complexity, - "Use of `Vec::sort_by` when `Vec::sort_by_key` would be clearer" + "Use of `Vec::sort_by` when `Vec::sort_by_key` or `Vec::sort` would be clearer" } -declare_lint_pass!(SortByKey => [SORT_BY_KEY]); +declare_lint_pass!(UnnecessarySortBy => [UNNECESSARY_SORT_BY]); enum LintTrigger { Sort(SortDetection), @@ -205,12 +205,12 @@ fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option } } -impl LateLintPass<'_, '_> for SortByKey { +impl LateLintPass<'_, '_> for UnnecessarySortBy { fn check_expr(&mut self, cx: &LateContext<'_, '_>, expr: &Expr<'_>) { match detect_lint(cx, expr) { Some(LintTrigger::SortByKey(trigger)) => utils::span_lint_and_sugg( cx, - SORT_BY_KEY, + UNNECESSARY_SORT_BY, expr.span, "use Vec::sort_by_key here instead", "try", @@ -225,7 +225,7 @@ impl LateLintPass<'_, '_> for SortByKey { ), Some(LintTrigger::Sort(trigger)) => utils::span_lint_and_sugg( cx, - SORT_BY_KEY, + UNNECESSARY_SORT_BY, expr.span, "use Vec::sort here instead", "try", diff --git a/tests/ui/sort_by_key.fixed b/tests/ui/unnecessary_sort_by.fixed similarity index 100% rename from tests/ui/sort_by_key.fixed rename to tests/ui/unnecessary_sort_by.fixed diff --git a/tests/ui/sort_by_key.rs b/tests/ui/unnecessary_sort_by.rs similarity index 100% rename from tests/ui/sort_by_key.rs rename to tests/ui/unnecessary_sort_by.rs diff --git a/tests/ui/sort_by_key.stderr b/tests/ui/unnecessary_sort_by.stderr similarity index 100% rename from tests/ui/sort_by_key.stderr rename to tests/ui/unnecessary_sort_by.stderr From 20cb512e81ad03a014b40c377a01fdebaea66963 Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Sun, 31 May 2020 12:06:32 -0700 Subject: [PATCH 0153/4780] Updated test cases and formatted --- clippy_lints/src/lib.rs | 2 +- tests/ui/unnecessary_sort_by.fixed | 1 - tests/ui/unnecessary_sort_by.rs | 1 - tests/ui/unnecessary_sort_by.stderr | 24 ++++++++---------------- 4 files changed, 9 insertions(+), 19 deletions(-) diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 46df743b5..fd832d115 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -304,7 +304,6 @@ mod serde_api; mod shadow; mod single_component_path_imports; mod slow_vector_initialization; -mod unnecessary_sort_by; mod strings; mod suspicious_trait_impl; mod swap; @@ -319,6 +318,7 @@ mod try_err; mod types; mod unicode; mod unnamed_address; +mod unnecessary_sort_by; mod unsafe_removed_from_name; mod unused_io_amount; mod unused_self; diff --git a/tests/ui/unnecessary_sort_by.fixed b/tests/ui/unnecessary_sort_by.fixed index bb88df1a5..4521ae38d 100644 --- a/tests/ui/unnecessary_sort_by.fixed +++ b/tests/ui/unnecessary_sort_by.fixed @@ -1,5 +1,4 @@ // run-rustfix -#![warn(clippy::sort_by_key)] use std::cmp::Reverse; diff --git a/tests/ui/unnecessary_sort_by.rs b/tests/ui/unnecessary_sort_by.rs index 953c573d4..fdb5a8233 100644 --- a/tests/ui/unnecessary_sort_by.rs +++ b/tests/ui/unnecessary_sort_by.rs @@ -1,5 +1,4 @@ // run-rustfix -#![warn(clippy::sort_by_key_reverse)] use std::cmp::Reverse; diff --git a/tests/ui/unnecessary_sort_by.stderr b/tests/ui/unnecessary_sort_by.stderr index 291fd5500..b6365c170 100644 --- a/tests/ui/unnecessary_sort_by.stderr +++ b/tests/ui/unnecessary_sort_by.stderr @@ -1,48 +1,40 @@ error: use Vec::sort here instead - --> $DIR/sort_by_key.rs:13:5 + --> $DIR/unnecessary_sort_by.rs:12:5 | LL | vec.sort_by(|a, b| a.cmp(b)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort()` | - = note: `-D clippy::sort-by-key` implied by `-D warnings` + = note: `-D clippy::unnecessary-sort-by` implied by `-D warnings` error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key.rs:14:5 + --> $DIR/unnecessary_sort_by.rs:13:5 | LL | vec.sort_by(|a, b| (a + 5).abs().cmp(&(b + 5).abs())); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| (a + 5).abs())` error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key.rs:15:5 + --> $DIR/unnecessary_sort_by.rs:14:5 | LL | vec.sort_by(|a, b| id(-a).cmp(&id(-b))); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| id(-a))` error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key.rs:17:5 + --> $DIR/unnecessary_sort_by.rs:16:5 | LL | vec.sort_by(|a, b| b.cmp(a)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(b))` error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key.rs:18:5 + --> $DIR/unnecessary_sort_by.rs:17:5 | LL | vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs())); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse((b + 5).abs()))` error: use Vec::sort_by_key here instead - --> $DIR/sort_by_key.rs:19:5 + --> $DIR/unnecessary_sort_by.rs:18:5 | LL | vec.sort_by(|a, b| id(-b).cmp(&id(-a))); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(id(-b)))` -error: unknown clippy lint: clippy::sort_by_key_reverse - --> $DIR/sort_by_key.rs:2:9 - | -LL | #![warn(clippy::sort_by_key_reverse)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: did you mean: `clippy::sort_by_key` - | - = note: `-D clippy::unknown-clippy-lints` implied by `-D warnings` - -error: aborting due to 7 previous errors +error: aborting due to 6 previous errors From 32fde0b5116b3a1115d11c49a9bf2af2ebdd5773 Mon Sep 17 00:00:00 2001 From: Ericko Samudera Date: Mon, 25 May 2020 23:22:01 +0700 Subject: [PATCH 0154/4780] New lint: iter_next_slice --- CHANGELOG.md | 1 + clippy_lints/src/lib.rs | 3 + clippy_lints/src/loops.rs | 26 ++++----- clippy_lints/src/methods/mod.rs | 84 ++++++++++++++++++++++++++- clippy_lints/src/needless_continue.rs | 2 +- src/lintlist/mod.rs | 7 +++ tests/ui/into_iter_on_ref.fixed | 2 + tests/ui/into_iter_on_ref.rs | 2 + tests/ui/into_iter_on_ref.stderr | 8 ++- tests/ui/iter_next_slice.fixed | 24 ++++++++ tests/ui/iter_next_slice.rs | 24 ++++++++ tests/ui/iter_next_slice.stderr | 28 +++++++++ tests/ui/needless_collect.fixed | 2 +- tests/ui/needless_collect.stderr | 16 ++--- 14 files changed, 204 insertions(+), 25 deletions(-) create mode 100644 tests/ui/iter_next_slice.fixed create mode 100644 tests/ui/iter_next_slice.rs create mode 100644 tests/ui/iter_next_slice.stderr diff --git a/CHANGELOG.md b/CHANGELOG.md index 2ac905719..714e25a32 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1401,6 +1401,7 @@ Released 2018-09-13 [`items_after_statements`]: https://rust-lang.github.io/rust-clippy/master/index.html#items_after_statements [`iter_cloned_collect`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_cloned_collect [`iter_next_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_next_loop +[`iter_next_slice`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_next_slice [`iter_nth`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_nth [`iter_nth_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_nth_zero [`iter_skip_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_skip_next diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 057d39d4c..7c16dbd8f 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -669,6 +669,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &methods::INTO_ITER_ON_REF, &methods::ITERATOR_STEP_BY_ZERO, &methods::ITER_CLONED_COLLECT, + &methods::ITER_NEXT_SLICE, &methods::ITER_NTH, &methods::ITER_NTH_ZERO, &methods::ITER_SKIP_NEXT, @@ -1303,6 +1304,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&methods::INTO_ITER_ON_REF), LintId::of(&methods::ITERATOR_STEP_BY_ZERO), LintId::of(&methods::ITER_CLONED_COLLECT), + LintId::of(&methods::ITER_NEXT_SLICE), LintId::of(&methods::ITER_NTH), LintId::of(&methods::ITER_NTH_ZERO), LintId::of(&methods::ITER_SKIP_NEXT), @@ -1483,6 +1485,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&methods::CHARS_NEXT_CMP), LintId::of(&methods::INTO_ITER_ON_REF), LintId::of(&methods::ITER_CLONED_COLLECT), + LintId::of(&methods::ITER_NEXT_SLICE), LintId::of(&methods::ITER_NTH_ZERO), LintId::of(&methods::ITER_SKIP_NEXT), LintId::of(&methods::MANUAL_SATURATING_ARITHMETIC), diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 38a5829b3..dbe41823a 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -27,7 +27,7 @@ use rustc_middle::middle::region; use rustc_middle::ty::{self, Ty}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; -use rustc_span::BytePos; +use rustc_span::symbol::Symbol; use rustc_typeck::expr_use_visitor::{ConsumeMode, Delegate, ExprUseVisitor, Place, PlaceBase}; use std::iter::{once, Iterator}; use std::mem; @@ -2381,32 +2381,32 @@ fn check_needless_collect<'a, 'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'a, ' match_type(cx, ty, &paths::BTREEMAP) || is_type_diagnostic_item(cx, ty, sym!(hashmap_type)) { if method.ident.name == sym!(len) { - let span = shorten_needless_collect_span(expr); + let span = shorten_span(expr, sym!(collect)); span_lint_and_sugg( cx, NEEDLESS_COLLECT, span, NEEDLESS_COLLECT_MSG, "replace with", - ".count()".to_string(), + "count()".to_string(), Applicability::MachineApplicable, ); } if method.ident.name == sym!(is_empty) { - let span = shorten_needless_collect_span(expr); + let span = shorten_span(expr, sym!(iter)); span_lint_and_sugg( cx, NEEDLESS_COLLECT, span, NEEDLESS_COLLECT_MSG, "replace with", - ".next().is_none()".to_string(), + "get(0).is_none()".to_string(), Applicability::MachineApplicable, ); } if method.ident.name == sym!(contains) { let contains_arg = snippet(cx, args[1].span, "??"); - let span = shorten_needless_collect_span(expr); + let span = shorten_span(expr, sym!(collect)); span_lint_and_then( cx, NEEDLESS_COLLECT, @@ -2422,7 +2422,7 @@ fn check_needless_collect<'a, 'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'a, ' span, "replace with", format!( - ".any(|{}| x == {})", + "any(|{}| x == {})", arg, pred ), Applicability::MachineApplicable, @@ -2435,13 +2435,13 @@ fn check_needless_collect<'a, 'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'a, ' } } -fn shorten_needless_collect_span(expr: &Expr<'_>) -> Span { - if_chain! { - if let ExprKind::MethodCall(_, _, ref args) = expr.kind; - if let ExprKind::MethodCall(_, ref span, _) = args[0].kind; - then { - return expr.span.with_lo(span.lo() - BytePos(1)); +fn shorten_span(expr: &Expr<'_>, target_fn_name: Symbol) -> Span { + let mut current_expr = expr; + while let ExprKind::MethodCall(ref path, ref span, ref args) = current_expr.kind { + if path.ident.name == target_fn_name { + return expr.span.with_lo(span.lo()); } + current_expr = &args[0]; } unreachable!() } diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index 32b3b7f79..7cb04d4d8 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -26,7 +26,7 @@ use rustc_span::symbol::{sym, SymbolStr}; use crate::consts::{constant, Constant}; use crate::utils::usage::mutated_variables; use crate::utils::{ - get_arg_name, get_parent_expr, get_trait_def_id, has_iter_method, implements_trait, in_macro, is_copy, + get_arg_name, get_parent_expr, get_trait_def_id, has_iter_method, higher, implements_trait, in_macro, is_copy, is_ctor_or_promotable_const_function, is_expn_of, is_type_diagnostic_item, iter_input_pats, last_path_segment, match_def_path, match_qpath, match_trait_method, match_type, match_var, method_calls, method_chain_args, paths, remove_blocks, return_ty, same_tys, single_segment_path, snippet, snippet_with_applicability, @@ -1242,6 +1242,32 @@ declare_clippy_lint! { "using `as_ref().map(Deref::deref)`, which is more succinctly expressed as `as_deref()`" } +declare_clippy_lint! { + /// **What it does:** Checks for usage of `iter().next()` on a Slice or an Array + /// + /// **Why is this bad?** These can be shortened into `.get()` + /// + /// **Known problems:** None. + /// + /// **Example:** + /// ```rust + /// # let a = [1, 2, 3]; + /// # let b = vec![1, 2, 3]; + /// a[2..].iter().next(); + /// b.iter().next(); + /// ``` + /// should be written as: + /// ```rust + /// # let a = [1, 2, 3]; + /// # let b = vec![1, 2, 3]; + /// a.get(2); + /// b.get(0); + /// ``` + pub ITER_NEXT_SLICE, + style, + "using `.iter().next()` on a sliced array, which can be shortened to just `.get()`" +} + declare_lint_pass!(Methods => [ UNWRAP_USED, EXPECT_USED, @@ -1273,6 +1299,7 @@ declare_lint_pass!(Methods => [ FIND_MAP, MAP_FLATTEN, ITERATOR_STEP_BY_ZERO, + ITER_NEXT_SLICE, ITER_NTH, ITER_NTH_ZERO, ITER_SKIP_NEXT, @@ -1320,6 +1347,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Methods { }, ["next", "filter"] => lint_filter_next(cx, expr, arg_lists[1]), ["next", "skip_while"] => lint_skip_while_next(cx, expr, arg_lists[1]), + ["next", "iter"] => lint_iter_next(cx, expr, arg_lists[1]), ["map", "filter"] => lint_filter_map(cx, expr, arg_lists[1], arg_lists[0]), ["map", "filter_map"] => lint_filter_map_map(cx, expr, arg_lists[1], arg_lists[0]), ["next", "filter_map"] => lint_filter_map_next(cx, expr, arg_lists[1]), @@ -2184,6 +2212,60 @@ fn lint_step_by<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &hir::Expr<'_>, args } } +fn lint_iter_next<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr<'_>, iter_args: &'tcx [hir::Expr<'_>]) { + let caller_expr = &iter_args[0]; + + // Skip lint if the `iter().next()` expression is a for loop argument, + // since it is already covered by `&loops::ITER_NEXT_LOOP` + let mut parent_expr_opt = get_parent_expr(cx, expr); + while let Some(parent_expr) = parent_expr_opt { + if higher::for_loop(parent_expr).is_some() { + return; + } + parent_expr_opt = get_parent_expr(cx, parent_expr); + } + + if derefs_to_slice(cx, caller_expr, cx.tables.expr_ty(caller_expr)).is_some() { + // caller is a Slice + if_chain! { + if let hir::ExprKind::Index(ref caller_var, ref index_expr) = &caller_expr.kind; + if let Some(higher::Range { start: Some(start_expr), end: None, limits: ast::RangeLimits::HalfOpen }) + = higher::range(cx, index_expr); + if let hir::ExprKind::Lit(ref start_lit) = &start_expr.kind; + if let ast::LitKind::Int(start_idx, _) = start_lit.node; + then { + let mut applicability = Applicability::MachineApplicable; + span_lint_and_sugg( + cx, + ITER_NEXT_SLICE, + expr.span, + "Using `.iter().next()` on a Slice without end index.", + "try calling", + format!("{}.get({})", snippet_with_applicability(cx, caller_var.span, "..", &mut applicability), start_idx), + applicability, + ); + } + } + } else if is_type_diagnostic_item(cx, cx.tables.expr_ty(caller_expr), sym!(vec_type)) + || matches!(&walk_ptrs_ty(cx.tables.expr_ty(caller_expr)).kind, ty::Array(_, _)) + { + // caller is a Vec or an Array + let mut applicability = Applicability::MachineApplicable; + span_lint_and_sugg( + cx, + ITER_NEXT_SLICE, + expr.span, + "Using `.iter().next()` on an array", + "try calling", + format!( + "{}.get(0)", + snippet_with_applicability(cx, caller_expr.span, "..", &mut applicability) + ), + applicability, + ); + } +} + fn lint_iter_nth<'a, 'tcx>( cx: &LateContext<'a, 'tcx>, expr: &hir::Expr<'_>, diff --git a/clippy_lints/src/needless_continue.rs b/clippy_lints/src/needless_continue.rs index 28183810d..a971d041c 100644 --- a/clippy_lints/src/needless_continue.rs +++ b/clippy_lints/src/needless_continue.rs @@ -424,7 +424,7 @@ fn erode_from_back(s: &str) -> String { } fn span_of_first_expr_in_block(block: &ast::Block) -> Option { - block.stmts.iter().next().map(|stmt| stmt.span) + block.stmts.get(0).map(|stmt| stmt.span) } #[cfg(test)] diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index 8211a57b5..79da1f370 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -934,6 +934,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "loops", }, + Lint { + name: "iter_next_slice", + group: "style", + desc: "using `.iter().next()` on a sliced array, which can be shortened to just `.get()`", + deprecation: None, + module: "methods", + }, Lint { name: "iter_nth", group: "perf", diff --git a/tests/ui/into_iter_on_ref.fixed b/tests/ui/into_iter_on_ref.fixed index c30d23de3..7f92d0dbd 100644 --- a/tests/ui/into_iter_on_ref.fixed +++ b/tests/ui/into_iter_on_ref.fixed @@ -40,4 +40,6 @@ fn main() { let _ = (&HashSet::::new()).iter(); //~ WARN equivalent to .iter() let _ = std::path::Path::new("12/34").iter(); //~ WARN equivalent to .iter() let _ = std::path::PathBuf::from("12/34").iter(); //~ ERROR equivalent to .iter() + + let _ = (&[1, 2, 3]).iter().next(); //~ WARN equivalent to .iter() } diff --git a/tests/ui/into_iter_on_ref.rs b/tests/ui/into_iter_on_ref.rs index 94bc16896..416056d3f 100644 --- a/tests/ui/into_iter_on_ref.rs +++ b/tests/ui/into_iter_on_ref.rs @@ -40,4 +40,6 @@ fn main() { let _ = (&HashSet::::new()).into_iter(); //~ WARN equivalent to .iter() let _ = std::path::Path::new("12/34").into_iter(); //~ WARN equivalent to .iter() let _ = std::path::PathBuf::from("12/34").into_iter(); //~ ERROR equivalent to .iter() + + let _ = (&[1, 2, 3]).into_iter().next(); //~ WARN equivalent to .iter() } diff --git a/tests/ui/into_iter_on_ref.stderr b/tests/ui/into_iter_on_ref.stderr index 80e2d104f..1cd6400b0 100644 --- a/tests/ui/into_iter_on_ref.stderr +++ b/tests/ui/into_iter_on_ref.stderr @@ -156,5 +156,11 @@ error: this `.into_iter()` call is equivalent to `.iter()` and will not move the LL | let _ = std::path::PathBuf::from("12/34").into_iter(); //~ ERROR equivalent to .iter() | ^^^^^^^^^ help: call directly: `iter` -error: aborting due to 26 previous errors +error: this `.into_iter()` call is equivalent to `.iter()` and will not move the `array` + --> $DIR/into_iter_on_ref.rs:44:26 + | +LL | let _ = (&[1, 2, 3]).into_iter().next(); //~ WARN equivalent to .iter() + | ^^^^^^^^^ help: call directly: `iter` + +error: aborting due to 27 previous errors diff --git a/tests/ui/iter_next_slice.fixed b/tests/ui/iter_next_slice.fixed new file mode 100644 index 000000000..79c1db87a --- /dev/null +++ b/tests/ui/iter_next_slice.fixed @@ -0,0 +1,24 @@ +// run-rustfix +#![warn(clippy::iter_next_slice)] + +fn main() { + // test code goes here + let s = [1, 2, 3]; + let v = vec![1, 2, 3]; + + s.get(0); + // Should be replaced by s.get(0) + + s.get(2); + // Should be replaced by s.get(2) + + v.get(5); + // Should be replaced by v.get(5) + + v.get(0); + // Should be replaced by v.get(0) + + let o = Some(5); + o.iter().next(); + // Shouldn't be linted since this is not a Slice or an Array +} diff --git a/tests/ui/iter_next_slice.rs b/tests/ui/iter_next_slice.rs new file mode 100644 index 000000000..ef9a55f3d --- /dev/null +++ b/tests/ui/iter_next_slice.rs @@ -0,0 +1,24 @@ +// run-rustfix +#![warn(clippy::iter_next_slice)] + +fn main() { + // test code goes here + let s = [1, 2, 3]; + let v = vec![1, 2, 3]; + + s.iter().next(); + // Should be replaced by s.get(0) + + s[2..].iter().next(); + // Should be replaced by s.get(2) + + v[5..].iter().next(); + // Should be replaced by v.get(5) + + v.iter().next(); + // Should be replaced by v.get(0) + + let o = Some(5); + o.iter().next(); + // Shouldn't be linted since this is not a Slice or an Array +} diff --git a/tests/ui/iter_next_slice.stderr b/tests/ui/iter_next_slice.stderr new file mode 100644 index 000000000..bbf61df0c --- /dev/null +++ b/tests/ui/iter_next_slice.stderr @@ -0,0 +1,28 @@ +error: Using `.iter().next()` on an array + --> $DIR/iter_next_slice.rs:9:5 + | +LL | s.iter().next(); + | ^^^^^^^^^^^^^^^ help: try calling: `s.get(0)` + | + = note: `-D clippy::iter-next-slice` implied by `-D warnings` + +error: Using `.iter().next()` on a Slice without end index. + --> $DIR/iter_next_slice.rs:12:5 + | +LL | s[2..].iter().next(); + | ^^^^^^^^^^^^^^^^^^^^ help: try calling: `s.get(2)` + +error: Using `.iter().next()` on a Slice without end index. + --> $DIR/iter_next_slice.rs:15:5 + | +LL | v[5..].iter().next(); + | ^^^^^^^^^^^^^^^^^^^^ help: try calling: `v.get(5)` + +error: Using `.iter().next()` on an array + --> $DIR/iter_next_slice.rs:18:5 + | +LL | v.iter().next(); + | ^^^^^^^^^^^^^^^ help: try calling: `v.get(0)` + +error: aborting due to 4 previous errors + diff --git a/tests/ui/needless_collect.fixed b/tests/ui/needless_collect.fixed index b4227eaf2..be37dc16b 100644 --- a/tests/ui/needless_collect.fixed +++ b/tests/ui/needless_collect.fixed @@ -9,7 +9,7 @@ use std::collections::{BTreeSet, HashMap, HashSet}; fn main() { let sample = [1; 5]; let len = sample.iter().count(); - if sample.iter().next().is_none() { + if sample.get(0).is_none() { // Empty } sample.iter().cloned().any(|x| x == 1); diff --git a/tests/ui/needless_collect.stderr b/tests/ui/needless_collect.stderr index 8884c8e16..9113aad90 100644 --- a/tests/ui/needless_collect.stderr +++ b/tests/ui/needless_collect.stderr @@ -1,28 +1,28 @@ error: avoid using `collect()` when not needed - --> $DIR/needless_collect.rs:11:28 + --> $DIR/needless_collect.rs:11:29 | LL | let len = sample.iter().collect::>().len(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `.count()` + | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `count()` | = note: `-D clippy::needless-collect` implied by `-D warnings` error: avoid using `collect()` when not needed - --> $DIR/needless_collect.rs:12:21 + --> $DIR/needless_collect.rs:12:15 | LL | if sample.iter().collect::>().is_empty() { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `.next().is_none()` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `get(0).is_none()` error: avoid using `collect()` when not needed - --> $DIR/needless_collect.rs:15:27 + --> $DIR/needless_collect.rs:15:28 | LL | sample.iter().cloned().collect::>().contains(&1); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `.any(|x| x == 1)` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `any(|x| x == 1)` error: avoid using `collect()` when not needed - --> $DIR/needless_collect.rs:16:34 + --> $DIR/needless_collect.rs:16:35 | LL | sample.iter().map(|x| (x, x)).collect::>().len(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `.count()` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `count()` error: aborting due to 4 previous errors From 7727c4ac7f3d4c977866bd8e6659a3e27f0bb6aa Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= Date: Thu, 28 May 2020 21:42:01 +0200 Subject: [PATCH 0155/4780] CONTRIBUTING: explain how to use cargo dev ra-setup Fixes #5514 --- CONTRIBUTING.md | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 0f47ac98f..9f7bdcb1b 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -12,14 +12,16 @@ anything, feel free to ask questions on issues or visit the `#clippy` on [Discor All contributors are expected to follow the [Rust Code of Conduct]. -* [Getting started](#getting-started) - * [Finding something to fix/improve](#finding-something-to-fiximprove) -* [Writing code](#writing-code) -* [How Clippy works](#how-clippy-works) -* [Fixing nightly build failures](#fixing-build-failures-caused-by-rust) -* [Issue and PR Triage](#issue-and-pr-triage) -* [Bors and Homu](#bors-and-homu) -* [Contributions](#contributions) +- [Contributing to Clippy](#contributing-to-clippy) + - [Getting started](#getting-started) + - [Finding something to fix/improve](#finding-something-to-fiximprove) + - [Writing code](#writing-code) + - [Getting code-completion for rustc internals to work](#getting-code-completion-for-rustc-internals-to-work) + - [How Clippy works](#how-clippy-works) + - [Fixing build failures caused by Rust](#fixing-build-failures-caused-by-rust) + - [Issue and PR triage](#issue-and-pr-triage) + - [Bors and Homu](#bors-and-homu) + - [Contributions](#contributions) [Discord]: https://discord.gg/rust-lang [Rust Code of Conduct]: https://www.rust-lang.org/policies/code-of-conduct @@ -91,6 +93,24 @@ quick read. [rfc_stability]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md#stability-guarantees [rfc_lint_cats]: https://github.com/rust-lang/rfcs/blob/master/text/2476-clippy-uno.md#lint-audit-and-categories +## Getting code-completion for rustc internals to work + +Unfortunately, [`rust-analyzer`][ra_homepage] does not (yet?) understand how Clippy uses compiler-internals +using `extern crate` and it also needs to be able to read the source files of the rustc-compiler which are not +available via a `rustup` component at the time of writing. +To work around this, you need to have a copy of the [rustc-repo][rustc_repo] available which can be obtained via +`git clone https://github.com/rust-lang/rust/`. +Then you can run a `cargo dev` command to automatically make Clippy use the rustc-repo via path-dependencies +which rust-analyzer will be able to understand. +Run `cargo dev ra-setup --repo-path ` where `` is an absolute path to the rustc repo +you just cloned. +The command will add path-dependencies pointing towards rustc-crates inside the rustc repo to +Clippys `Cargo.toml`s and should allow rust-analyzer to understand most of the types that Clippy uses. +Just make sure to remove the dependencies again before finally making a pull request! + +[ra_homepage]: https://rust-analyzer.github.io/ +[rustc_repo]: https://github.com/rust-lang/rust/ + ## How Clippy works [`clippy_lints/src/lib.rs`][lint_crate_entry] imports all the different lint modules and registers in the [`LintStore`]. From 9a5baed482b68e0d9806e19eb9e8676d7ff3e1c2 Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Sun, 31 May 2020 15:09:12 -0700 Subject: [PATCH 0156/4780] Implement suggestions from phansch --- clippy_lints/src/unnecessary_sort_by.rs | 41 ++++++++++++++++++++----- tests/ui/unnecessary_sort_by.fixed | 7 +++-- tests/ui/unnecessary_sort_by.rs | 7 +++-- tests/ui/unnecessary_sort_by.stderr | 26 ++++++++++------ 4 files changed, 57 insertions(+), 24 deletions(-) diff --git a/clippy_lints/src/unnecessary_sort_by.rs b/clippy_lints/src/unnecessary_sort_by.rs index c0858ec4c..33d8331c2 100644 --- a/clippy_lints/src/unnecessary_sort_by.rs +++ b/clippy_lints/src/unnecessary_sort_by.rs @@ -18,15 +18,25 @@ declare_clippy_lint! { /// possible) than to use `Vec::sort_by` and and a more complicated /// closure. /// - /// **Known problems:** None. + /// **Known problems:** + /// If the suggested `Vec::sort_by_key` uses Reverse and it isn't + /// imported by a use statement in the current frame, then a `use` + /// statement that imports it will need to be added (which this lint + /// can't do). /// /// **Example:** /// /// ```rust - /// vec.sort_by(|a, b| a.foo().cmp(b.foo())); + /// # struct A; + /// # impl A { fn foo(&self) {} } + /// # let mut vec: Vec = Vec::new(); + /// vec.sort_by(|a, b| a.foo().cmp(&b.foo())); /// ``` /// Use instead: /// ```rust + /// # struct A; + /// # impl A { fn foo(&self) {} } + /// # let mut vec: Vec = Vec::new(); /// vec.sort_by_key(|a| a.foo()); /// ``` pub UNNECESSARY_SORT_BY, @@ -50,6 +60,7 @@ struct SortByKeyDetection { vec_name: String, closure_arg: String, closure_body: String, + reverse: bool, unstable: bool, } @@ -172,16 +183,16 @@ fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option if let ExprKind::MethodCall(method_path, _, [ref left_expr, ref right_expr]) = &closure_body.value.kind; if method_path.ident.name.to_ident_string() == "cmp"; then { - let (closure_body, closure_arg) = if mirrored_exprs( + let (closure_body, closure_arg, reverse) = if mirrored_exprs( &cx, &left_expr, &left_ident, &right_expr, &right_ident ) { - (Sugg::hir(cx, &left_expr, "..").to_string(), left_ident.name.to_string()) + (Sugg::hir(cx, &left_expr, "..").to_string(), left_ident.name.to_string(), false) } else if mirrored_exprs(&cx, &left_expr, &right_ident, &right_expr, &left_ident) { - (format!("Reverse({})", Sugg::hir(cx, &left_expr, "..").to_string()), right_ident.name.to_string()) + (Sugg::hir(cx, &left_expr, "..").to_string(), right_ident.name.to_string(), true) } else { return None; }; @@ -196,7 +207,13 @@ fn detect_lint(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> Option Some(LintTrigger::Sort(SortDetection { vec_name, unstable })) } else { - Some(LintTrigger::SortByKey(SortByKeyDetection { vec_name, unstable, closure_arg, closure_body })) + Some(LintTrigger::SortByKey(SortByKeyDetection { + vec_name, + unstable, + closure_arg, + closure_body, + reverse + })) } } } else { @@ -219,9 +236,17 @@ impl LateLintPass<'_, '_> for UnnecessarySortBy { trigger.vec_name, if trigger.unstable { "_unstable" } else { "" }, trigger.closure_arg, - trigger.closure_body, + if trigger.reverse { + format!("Reverse({})", trigger.closure_body) + } else { + trigger.closure_body.to_string() + }, ), - Applicability::MachineApplicable, + if trigger.reverse { + Applicability::MaybeIncorrect + } else { + Applicability::MachineApplicable + }, ), Some(LintTrigger::Sort(trigger)) => utils::span_lint_and_sugg( cx, diff --git a/tests/ui/unnecessary_sort_by.fixed b/tests/ui/unnecessary_sort_by.fixed index 4521ae38d..779fd5770 100644 --- a/tests/ui/unnecessary_sort_by.fixed +++ b/tests/ui/unnecessary_sort_by.fixed @@ -10,16 +10,17 @@ fn main() { let mut vec: Vec = vec![3, 6, 1, 2, 5]; // Forward examples vec.sort(); + vec.sort_unstable(); vec.sort_by_key(|&a| (a + 5).abs()); - vec.sort_by_key(|&a| id(-a)); + vec.sort_unstable_by_key(|&a| id(-a)); // Reverse examples vec.sort_by_key(|&b| Reverse(b)); vec.sort_by_key(|&b| Reverse((b + 5).abs())); - vec.sort_by_key(|&b| Reverse(id(-b))); + vec.sort_unstable_by_key(|&b| Reverse(id(-b))); // Negative examples (shouldn't be changed) let c = &7; vec.sort_by(|a, b| (b - a).cmp(&(a - b))); vec.sort_by(|_, b| b.cmp(&5)); vec.sort_by(|_, b| b.cmp(c)); - vec.sort_by(|a, _| a.cmp(c)); + vec.sort_unstable_by(|a, _| a.cmp(c)); } diff --git a/tests/ui/unnecessary_sort_by.rs b/tests/ui/unnecessary_sort_by.rs index fdb5a8233..0485a5630 100644 --- a/tests/ui/unnecessary_sort_by.rs +++ b/tests/ui/unnecessary_sort_by.rs @@ -10,16 +10,17 @@ fn main() { let mut vec: Vec = vec![3, 6, 1, 2, 5]; // Forward examples vec.sort_by(|a, b| a.cmp(b)); + vec.sort_unstable_by(|a, b| a.cmp(b)); vec.sort_by(|a, b| (a + 5).abs().cmp(&(b + 5).abs())); - vec.sort_by(|a, b| id(-a).cmp(&id(-b))); + vec.sort_unstable_by(|a, b| id(-a).cmp(&id(-b))); // Reverse examples vec.sort_by(|a, b| b.cmp(a)); vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs())); - vec.sort_by(|a, b| id(-b).cmp(&id(-a))); + vec.sort_unstable_by(|a, b| id(-b).cmp(&id(-a))); // Negative examples (shouldn't be changed) let c = &7; vec.sort_by(|a, b| (b - a).cmp(&(a - b))); vec.sort_by(|_, b| b.cmp(&5)); vec.sort_by(|_, b| b.cmp(c)); - vec.sort_by(|a, _| a.cmp(c)); + vec.sort_unstable_by(|a, _| a.cmp(c)); } diff --git a/tests/ui/unnecessary_sort_by.stderr b/tests/ui/unnecessary_sort_by.stderr index b6365c170..903b6e509 100644 --- a/tests/ui/unnecessary_sort_by.stderr +++ b/tests/ui/unnecessary_sort_by.stderr @@ -6,35 +6,41 @@ LL | vec.sort_by(|a, b| a.cmp(b)); | = note: `-D clippy::unnecessary-sort-by` implied by `-D warnings` -error: use Vec::sort_by_key here instead +error: use Vec::sort here instead --> $DIR/unnecessary_sort_by.rs:13:5 | +LL | vec.sort_unstable_by(|a, b| a.cmp(b)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_unstable()` + +error: use Vec::sort_by_key here instead + --> $DIR/unnecessary_sort_by.rs:14:5 + | LL | vec.sort_by(|a, b| (a + 5).abs().cmp(&(b + 5).abs())); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| (a + 5).abs())` error: use Vec::sort_by_key here instead - --> $DIR/unnecessary_sort_by.rs:14:5 + --> $DIR/unnecessary_sort_by.rs:15:5 | -LL | vec.sort_by(|a, b| id(-a).cmp(&id(-b))); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| id(-a))` +LL | vec.sort_unstable_by(|a, b| id(-a).cmp(&id(-b))); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_unstable_by_key(|&a| id(-a))` error: use Vec::sort_by_key here instead - --> $DIR/unnecessary_sort_by.rs:16:5 + --> $DIR/unnecessary_sort_by.rs:17:5 | LL | vec.sort_by(|a, b| b.cmp(a)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(b))` error: use Vec::sort_by_key here instead - --> $DIR/unnecessary_sort_by.rs:17:5 + --> $DIR/unnecessary_sort_by.rs:18:5 | LL | vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs())); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse((b + 5).abs()))` error: use Vec::sort_by_key here instead - --> $DIR/unnecessary_sort_by.rs:18:5 + --> $DIR/unnecessary_sort_by.rs:19:5 | -LL | vec.sort_by(|a, b| id(-b).cmp(&id(-a))); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(id(-b)))` +LL | vec.sort_unstable_by(|a, b| id(-b).cmp(&id(-a))); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_unstable_by_key(|&b| Reverse(id(-b)))` -error: aborting due to 6 previous errors +error: aborting due to 7 previous errors From b89880a30ce4dd7887614f305a565b6779dc4825 Mon Sep 17 00:00:00 2001 From: JarredAllen Date: Sun, 31 May 2020 15:19:31 -0700 Subject: [PATCH 0157/4780] Ran update_lints --- CHANGELOG.md | 2 +- clippy_lints/src/lib.rs | 6 +++--- src/lintlist/mod.rs | 14 +++++++------- 3 files changed, 11 insertions(+), 11 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index c00f84bdb..086a1141b 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1555,7 +1555,6 @@ Released 2018-09-13 [`single_match_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_match_else [`skip_while_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#skip_while_next [`slow_vector_initialization`]: https://rust-lang.github.io/rust-clippy/master/index.html#slow_vector_initialization -[`sort_by_key_reverse`]: https://rust-lang.github.io/rust-clippy/master/index.html#sort_by_key_reverse [`str_to_string`]: https://rust-lang.github.io/rust-clippy/master/index.html#str_to_string [`string_add`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_add [`string_add_assign`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_add_assign @@ -1602,6 +1601,7 @@ Released 2018-09-13 [`unnecessary_fold`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_fold [`unnecessary_mut_passed`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed [`unnecessary_operation`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_operation +[`unnecessary_sort_by`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_sort_by [`unnecessary_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_unwrap [`unneeded_field_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern [`unneeded_wildcard_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_wildcard_pattern diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index fd832d115..03addf1f4 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -780,7 +780,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &shadow::SHADOW_UNRELATED, &single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS, &slow_vector_initialization::SLOW_VECTOR_INITIALIZATION, - &unnecessary_sort_by::UNNECESSARY_SORT_BY, &strings::STRING_ADD, &strings::STRING_ADD_ASSIGN, &strings::STRING_LIT_AS_BYTES, @@ -835,6 +834,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &unicode::ZERO_WIDTH_SPACE, &unnamed_address::FN_ADDRESS_COMPARISONS, &unnamed_address::VTABLE_ADDRESS_COMPARISONS, + &unnecessary_sort_by::UNNECESSARY_SORT_BY, &unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME, &unused_io_amount::UNUSED_IO_AMOUNT, &unused_self::UNUSED_SELF, @@ -1394,7 +1394,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&serde_api::SERDE_API_MISUSE), LintId::of(&single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS), LintId::of(&slow_vector_initialization::SLOW_VECTOR_INITIALIZATION), - LintId::of(&unnecessary_sort_by::UNNECESSARY_SORT_BY), LintId::of(&strings::STRING_LIT_AS_BYTES), LintId::of(&suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL), LintId::of(&suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL), @@ -1431,6 +1430,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&unicode::ZERO_WIDTH_SPACE), LintId::of(&unnamed_address::FN_ADDRESS_COMPARISONS), LintId::of(&unnamed_address::VTABLE_ADDRESS_COMPARISONS), + LintId::of(&unnecessary_sort_by::UNNECESSARY_SORT_BY), LintId::of(&unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME), LintId::of(&unused_io_amount::UNUSED_IO_AMOUNT), LintId::of(&unwrap::PANICKING_UNWRAP), @@ -1596,7 +1596,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&ranges::RANGE_ZIP_WITH_LEN), LintId::of(&reference::DEREF_ADDROF), LintId::of(&reference::REF_IN_DEREF), - LintId::of(&unnecessary_sort_by::UNNECESSARY_SORT_BY), LintId::of(&swap::MANUAL_SWAP), LintId::of(&temporary_assignment::TEMPORARY_ASSIGNMENT), LintId::of(&transmute::CROSSPOINTER_TRANSMUTE), @@ -1613,6 +1612,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&types::UNIT_ARG), LintId::of(&types::UNNECESSARY_CAST), LintId::of(&types::VEC_BOX), + LintId::of(&unnecessary_sort_by::UNNECESSARY_SORT_BY), LintId::of(&unwrap::UNNECESSARY_UNWRAP), LintId::of(&useless_conversion::USELESS_CONVERSION), LintId::of(&zero_div_zero::ZERO_DIVIDED_BY_ZERO), diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index b5d9ef011..ab9542a7b 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1984,13 +1984,6 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "slow_vector_initialization", }, - Lint { - name: "sort_by_key_reverse", - group: "complexity", - desc: "Use of `Vec::sort_by` when `Vec::sort_by_key` would be clearer", - deprecation: None, - module: "sort_by_key_reverse", - }, Lint { name: "string_add", group: "restriction", @@ -2299,6 +2292,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "no_effect", }, + Lint { + name: "unnecessary_sort_by", + group: "complexity", + desc: "Use of `Vec::sort_by` when `Vec::sort_by_key` or `Vec::sort` would be clearer", + deprecation: None, + module: "unnecessary_sort_by", + }, Lint { name: "unnecessary_unwrap", group: "complexity", From 6955420ace822ec888cc999a623c67c51ced839f Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 1 Jun 2020 00:28:58 +0200 Subject: [PATCH 0158/4780] Update changelog for stable:1.44 beta:1.45 --- CHANGELOG.md | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 79 insertions(+), 3 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index f7dae3dcf..fcc9895dd 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -6,11 +6,87 @@ document. ## Unreleased / In Rust Nightly -[891e1a8...master](https://github.com/rust-lang/rust-clippy/compare/891e1a8...master) +[7ea7cd1...master](https://github.com/rust-lang/rust-clippy/compare/7ea7cd1...master) + +## Rust 1.45 + +Current beta, release 2020-07-16 + +[891e1a8...7ea7cd1](https://github.com/rust-lang/rust-clippy/compare/891e1a8...7ea7cd1) + +### New lints + +* [`match_wildcard_for_single_variants`] [#5582](https://github.com/rust-lang/rust-clippy/pull/5582) +* [`unsafe_derive_deserialize`] [#5493](https://github.com/rust-lang/rust-clippy/pull/5493) +* [`if_let_mutex`] [#5332](https://github.com/rust-lang/rust-clippy/pull/5332) +* [`mismatched_target_os`] [#5506](https://github.com/rust-lang/rust-clippy/pull/5506) +* [`await_holding_lock`] [#5439](https://github.com/rust-lang/rust-clippy/pull/5439) +* [`match_on_vec_items`] [#5522](https://github.com/rust-lang/rust-clippy/pull/5522) +* [`manual_async_fn`] [#5576](https://github.com/rust-lang/rust-clippy/pull/5576) +* [`reversed_empty_ranges`] [#5583](https://github.com/rust-lang/rust-clippy/pull/5583) +* [`manual_non_exhaustive`] [#5550](https://github.com/rust-lang/rust-clippy/pull/5550) + +### Moves and Deprecations + +* Downgrade [`match_bool`] to pedantic [#5408](https://github.com/rust-lang/rust-clippy/pull/5408) +* Downgrade [`match_wild_err_arm`] to pedantic and update help messages. [#5622](https://github.com/rust-lang/rust-clippy/pull/5622) +* Downgrade [`useless_let_if_seq`] to nursery. [#5599](https://github.com/rust-lang/rust-clippy/pull/5599) +* Generalize [`option_and_then_some`] and rename to [`bind_instead_of_map`]. [#5529](https://github.com/rust-lang/rust-clippy/pull/5529) +* Rename [`identity_conversion`] to [`useless_conversion`]. [#5568](https://github.com/rust-lang/rust-clippy/pull/5568) +* Merge [`block_in_if_condition_expr`] and [`block_in_if_condition_stmt`] into [`blocks_in_if_conditions`]. +[#5563](https://github.com/rust-lang/rust-clippy/pull/5563) +* Merge [`option_map_unwrap_or`], [`option_map_unwrap_or_else`] and [`result_map_unwrap_or_else`] into [`map_unwrap_or`]. +[#5563](https://github.com/rust-lang/rust-clippy/pull/5563) +* Merge [`option_unwrap_used`] and [`result_unwrap_used`] into [`unwrap_used`]. +[#5563](https://github.com/rust-lang/rust-clippy/pull/5563) +* Merge [`option_expect_used`] and [`result_expect_used`] into [`expect_used`]. +[#5563](https://github.com/rust-lang/rust-clippy/pull/5563) +* Merge [`for_loop_over_option`] and [`for_loop_over_result`] into [`for_loops_over_fallibles`]. +[#5563](https://github.com/rust-lang/rust-clippy/pull/5563) + +### Enhancements + +* Avoid running cargo/internal lints when not enabled. [#5505](https://github.com/rust-lang/rust-clippy/pull/5505) +* Extend [`useless_conversion`] with `TryFrom` and `TryInto`. [#5631](https://github.com/rust-lang/rust-clippy/pull/5631) +* Lint also in type parameters and where clauses in [`unused_unit`]. [#5592](https://github.com/rust-lang/rust-clippy/pull/5592) +* Do not suggest deriving `Default` in [`new_without_default`]. [#5616](https://github.com/rust-lang/rust-clippy/pull/5616) + +### False Positive Fixes + +* [`while_let_on_iterator`] [#5525](https://github.com/rust-lang/rust-clippy/pull/5525) +* [`empty_line_after_outer_attr`] [#5609](https://github.com/rust-lang/rust-clippy/pull/5609) +* [`unnecessary_unwrap`] [#5558](https://github.com/rust-lang/rust-clippy/pull/5558) +* [`comparison_chain`] [#5596](https://github.com/rust-lang/rust-clippy/pull/5596) +* Don't trigger [`used_underscore_binding`] in await desugaring. [#5535](https://github.com/rust-lang/rust-clippy/pull/5535) +* Don't trigger [`borrowed_box`] on mutable references. [#5491](https://github.com/rust-lang/rust-clippy/pull/5491) +* Allow `1 << 0` in [`identity_op`]. [#5602](https://github.com/rust-lang/rust-clippy/pull/5602) +* Allow `use super::*;` glob imports in [`wildcard_imports`]. [#5564](https://github.com/rust-lang/rust-clippy/pull/5564) +* Add ignores to the list of words of [`clippy::doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611) +* Skip dev and build deps in [`multiple_crate_versions`]. [#5636](https://github.com/rust-lang/rust-clippy/pull/5636) +* Honor `allow` attribute on arguments in [`ptr_arg`]. [#5647](https://github.com/rust-lang/rust-clippy/pull/5647) +* Honor lint level attributes for [`redundant_field_names`] and [`non_expressive_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/5651) +* Ignore calls to `len` in [`or_fun_call`]. [#4429](https://github.com/rust-lang/rust-clippy/pull/4429) + +### Suggestion Improvements + +* Simplify suggestions in [`manual_memcpy`]. [#5536](https://github.com/rust-lang/rust-clippy/pull/5536) +* Fix suggestion in [`redundant_pattern_matching`] for macros. [#5511](https://github.com/rust-lang/rust-clippy/pull/5511) +* Avoid suggesting `copied()` for mutable references in [`map_clone`]. [#5530](https://github.com/rust-lang/rust-clippy/pull/5530) +* Improve help message for [`clone_double_ref`]. [#5547](https://github.com/rust-lang/rust-clippy/pull/5547) + +### ICE Fixes + +* Fix ICE caused in unwrap module. [#5590](https://github.com/rust-lang/rust-clippy/pull/5590) +* Fix crash on rustc test issue-69020-assoc-const-arith-overflow.rs [#5499](https://github.com/rust-lang/rust-clippy/pull/5499) + +### Documentation + +* Clarify the documentation of [`unnecessary_mut_passed`]. [#5639](https://github.com/rust-lang/rust-clippy/pull/5639) +* Extend example for [`unneeded_field_pattern`]. [#5541](https://github.com/rust-lang/rust-clippy/pull/5541) ## Rust 1.44 -Current beta, release 2020-06-04 +Current stable, released 2020-06-04 [204bb9b...891e1a8](https://github.com/rust-lang/rust-clippy/compare/204bb9b...891e1a8) @@ -93,7 +169,7 @@ Current beta, release 2020-06-04 ## Rust 1.43 -Current stable, released 2020-04-23 +Released 2020-04-23 [4ee1206...204bb9b](https://github.com/rust-lang/rust-clippy/compare/4ee1206...204bb9b) From ae0ce2255aea7e896cbfc0330c9d4f17ed66b55f Mon Sep 17 00:00:00 2001 From: Philipp Hansch Date: Mon, 1 Jun 2020 09:58:42 +0200 Subject: [PATCH 0159/4780] Add regression test for string_lit_as_bytes issue --- tests/ui/string_lit_as_bytes.fixed | 2 ++ tests/ui/string_lit_as_bytes.rs | 2 ++ tests/ui/string_lit_as_bytes.stderr | 4 ++-- 3 files changed, 6 insertions(+), 2 deletions(-) diff --git a/tests/ui/string_lit_as_bytes.fixed b/tests/ui/string_lit_as_bytes.fixed index 7ad272ade..ccf8f61c4 100644 --- a/tests/ui/string_lit_as_bytes.fixed +++ b/tests/ui/string_lit_as_bytes.fixed @@ -14,6 +14,8 @@ fn str_lit_as_bytes() { let strify = stringify!(foobar).as_bytes(); + let current_version = env!("CARGO_PKG_VERSION").as_bytes(); + let includestr = include_bytes!("entry_unfixable.rs"); let _ = b"string with newline\t\n"; diff --git a/tests/ui/string_lit_as_bytes.rs b/tests/ui/string_lit_as_bytes.rs index 1bf4538b7..178df08e2 100644 --- a/tests/ui/string_lit_as_bytes.rs +++ b/tests/ui/string_lit_as_bytes.rs @@ -14,6 +14,8 @@ fn str_lit_as_bytes() { let strify = stringify!(foobar).as_bytes(); + let current_version = env!("CARGO_PKG_VERSION").as_bytes(); + let includestr = include_str!("entry_unfixable.rs").as_bytes(); let _ = "string with newline\t\n".as_bytes(); diff --git a/tests/ui/string_lit_as_bytes.stderr b/tests/ui/string_lit_as_bytes.stderr index ff6e3346d..99c512354 100644 --- a/tests/ui/string_lit_as_bytes.stderr +++ b/tests/ui/string_lit_as_bytes.stderr @@ -13,13 +13,13 @@ LL | let bs = r###"raw string with 3# plus " ""###.as_bytes(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using a byte string literal instead: `br###"raw string with 3# plus " ""###` error: calling `as_bytes()` on `include_str!(..)` - --> $DIR/string_lit_as_bytes.rs:17:22 + --> $DIR/string_lit_as_bytes.rs:19:22 | LL | let includestr = include_str!("entry_unfixable.rs").as_bytes(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `include_bytes!(..)` instead: `include_bytes!("entry_unfixable.rs")` error: calling `as_bytes()` on a string literal - --> $DIR/string_lit_as_bytes.rs:19:13 + --> $DIR/string_lit_as_bytes.rs:21:13 | LL | let _ = "string with newline/t/n".as_bytes(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using a byte string literal instead: `b"string with newline/t/n"` From 861b897c54200becd6767ad6e091abef61f15344 Mon Sep 17 00:00:00 2001 From: Philipp Hansch Date: Mon, 1 Jun 2020 10:20:17 +0200 Subject: [PATCH 0160/4780] Add regression test for endless loop This was fixed in pulldown_cmark 0.7.1, specifically https://github.com/raphlinus/pulldown-cmark/pull/438 --- clippy_lints/Cargo.toml | 2 +- tests/ui/crashes/regressions.rs | 4 ++++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/clippy_lints/Cargo.toml b/clippy_lints/Cargo.toml index 98391732d..e959c1a65 100644 --- a/clippy_lints/Cargo.toml +++ b/clippy_lints/Cargo.toml @@ -21,7 +21,7 @@ cargo_metadata = "0.9.1" if_chain = "1.0.0" itertools = "0.9" lazy_static = "1.0.2" -pulldown-cmark = { version = "0.7", default-features = false } +pulldown-cmark = { version = "0.7.1", default-features = false } quine-mc_cluskey = "0.2.2" regex-syntax = "0.6" serde = { version = "1.0", features = ["derive"] } diff --git a/tests/ui/crashes/regressions.rs b/tests/ui/crashes/regressions.rs index 623ae51f9..3d5063d1a 100644 --- a/tests/ui/crashes/regressions.rs +++ b/tests/ui/crashes/regressions.rs @@ -6,4 +6,8 @@ pub fn foo(bar: *const u8) { println!("{:#p}", bar); } +// Regression test for https://github.com/rust-lang/rust-clippy/issues/4917 +/// Date: Wed, 27 May 2020 16:24:53 +0200 Subject: [PATCH 0161/4780] Fix some code examples in doc --- clippy_lints/src/assign_ops.rs | 4 +++ clippy_lints/src/double_parens.rs | 18 +++++++++++-- clippy_lints/src/drop_bounds.rs | 4 +++ clippy_lints/src/duration_subsec.rs | 6 +++++ clippy_lints/src/enum_variants.rs | 32 +++++++++++++++++++---- clippy_lints/src/eq_op.rs | 4 +++ clippy_lints/src/escape.rs | 7 +++++ clippy_lints/src/eta_reduction.rs | 4 +++ clippy_lints/src/eval_order_dependence.rs | 6 +++++ 9 files changed, 78 insertions(+), 7 deletions(-) diff --git a/clippy_lints/src/assign_ops.rs b/clippy_lints/src/assign_ops.rs index 05e2650d0..13e61fe98 100644 --- a/clippy_lints/src/assign_ops.rs +++ b/clippy_lints/src/assign_ops.rs @@ -24,7 +24,11 @@ declare_clippy_lint! { /// let mut a = 5; /// let b = 0; /// // ... + /// // Bad /// a = a + b; + /// + /// // Good + /// a += b; /// ``` pub ASSIGN_OP_PATTERN, style, diff --git a/clippy_lints/src/double_parens.rs b/clippy_lints/src/double_parens.rs index 7f2ff8b9b..05517f6f9 100644 --- a/clippy_lints/src/double_parens.rs +++ b/clippy_lints/src/double_parens.rs @@ -13,10 +13,24 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// // Bad + /// fn simple_double_parens() -> i32 { + /// ((0)) + /// } + /// + /// // Good + /// fn simple_no_parens() -> i32 { + /// 0 + /// } + /// + /// // or + /// /// # fn foo(bar: usize) {} - /// ((0)); + /// // Bad /// foo((0)); - /// ((1, 2)); + /// + /// // Good + /// foo(0); /// ``` pub DOUBLE_PARENS, complexity, diff --git a/clippy_lints/src/drop_bounds.rs b/clippy_lints/src/drop_bounds.rs index f49668082..4ef963ac3 100644 --- a/clippy_lints/src/drop_bounds.rs +++ b/clippy_lints/src/drop_bounds.rs @@ -27,6 +27,10 @@ declare_clippy_lint! { /// ```rust /// fn foo() {} /// ``` + /// Could be written as: + /// ```rust + /// fn foo() {} + /// ``` pub DROP_BOUNDS, correctness, "Bounds of the form `T: Drop` are useless" diff --git a/clippy_lints/src/duration_subsec.rs b/clippy_lints/src/duration_subsec.rs index b35a8facf..afefa2506 100644 --- a/clippy_lints/src/duration_subsec.rs +++ b/clippy_lints/src/duration_subsec.rs @@ -22,8 +22,14 @@ declare_clippy_lint! { /// ```rust /// # use std::time::Duration; /// let dur = Duration::new(5, 0); + /// + /// // Bad /// let _micros = dur.subsec_nanos() / 1_000; /// let _millis = dur.subsec_nanos() / 1_000_000; + /// + /// // Good + /// let _micros = dur.subsec_micros(); + /// let _millis = dur.subsec_millis(); /// ``` pub DURATION_SUBSEC, complexity, diff --git a/clippy_lints/src/enum_variants.rs b/clippy_lints/src/enum_variants.rs index a5871cf0c..cb0fd59a2 100644 --- a/clippy_lints/src/enum_variants.rs +++ b/clippy_lints/src/enum_variants.rs @@ -25,31 +25,47 @@ declare_clippy_lint! { /// BattenbergCake, /// } /// ``` + /// Could be written as: + /// ```rust + /// enum Cake { + /// BlackForest, + /// Hummingbird, + /// Battenberg, + /// } + /// ``` pub ENUM_VARIANT_NAMES, style, "enums where all variants share a prefix/postfix" } declare_clippy_lint! { - /// **What it does:** Detects enumeration variants that are prefixed or suffixed - /// by the same characters. + /// **What it does:** Detects public enumeration variants that are + /// prefixed or suffixed by the same characters. /// - /// **Why is this bad?** Enumeration variant names should specify their variant, + /// **Why is this bad?** Public enumeration variant names should specify their variant, /// not repeat the enumeration name. /// /// **Known problems:** None. /// /// **Example:** /// ```rust - /// enum Cake { + /// pub enum Cake { /// BlackForestCake, /// HummingbirdCake, /// BattenbergCake, /// } /// ``` + /// Could be written as: + /// ```rust + /// pub enum Cake { + /// BlackForest, + /// Hummingbird, + /// Battenberg, + /// } + /// ``` pub PUB_ENUM_VARIANT_NAMES, pedantic, - "enums where all variants share a prefix/postfix" + "public enums where all variants share a prefix/postfix" } declare_clippy_lint! { @@ -66,6 +82,12 @@ declare_clippy_lint! { /// struct BlackForestCake; /// } /// ``` + /// Could be written as: + /// ```rust + /// mod cake { + /// struct BlackForest; + /// } + /// ``` pub MODULE_NAME_REPETITIONS, pedantic, "type names prefixed/postfixed with their containing module's name" diff --git a/clippy_lints/src/eq_op.rs b/clippy_lints/src/eq_op.rs index 4e1c1f131..d7819d737 100644 --- a/clippy_lints/src/eq_op.rs +++ b/clippy_lints/src/eq_op.rs @@ -39,7 +39,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```ignore + /// // Bad /// &x == y + /// + /// // Good + /// x == *y /// ``` pub OP_REF, style, diff --git a/clippy_lints/src/escape.rs b/clippy_lints/src/escape.rs index 1ec60a0e6..7227683aa 100644 --- a/clippy_lints/src/escape.rs +++ b/clippy_lints/src/escape.rs @@ -28,9 +28,16 @@ declare_clippy_lint! { /// **Example:** /// ```rust /// # fn foo(bar: usize) {} + /// + /// // Bad /// let x = Box::new(1); /// foo(*x); /// println!("{}", *x); + /// + /// // Good + /// let x = 1; + /// foo(x); + /// println!("{}", x); /// ``` pub BOXED_LOCAL, perf, diff --git a/clippy_lints/src/eta_reduction.rs b/clippy_lints/src/eta_reduction.rs index e3e1136b6..5f0cd1ec7 100644 --- a/clippy_lints/src/eta_reduction.rs +++ b/clippy_lints/src/eta_reduction.rs @@ -26,7 +26,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust,ignore + /// // Bad /// xs.map(|x| foo(x)) + /// + /// // Good + /// foo(xs) /// ``` /// where `foo(_)` is a plain function that takes the exact argument type of /// `x`. diff --git a/clippy_lints/src/eval_order_dependence.rs b/clippy_lints/src/eval_order_dependence.rs index 5206266cc..37e24ff34 100644 --- a/clippy_lints/src/eval_order_dependence.rs +++ b/clippy_lints/src/eval_order_dependence.rs @@ -21,11 +21,17 @@ declare_clippy_lint! { /// **Example:** /// ```rust /// let mut x = 0; + /// + /// // Bad /// let a = { /// x = 1; /// 1 /// } + x; /// // Unclear whether a is 1 or 2. + /// + /// // Good + /// x = 1; + /// let a = 1 + x; /// ``` pub EVAL_ORDER_DEPENDENCE, complexity, From 262c9dc025042646610df879dd9708eea625534d Mon Sep 17 00:00:00 2001 From: ThibsG Date: Fri, 29 May 2020 18:15:42 +0200 Subject: [PATCH 0162/4780] Fix more code examples --- clippy_lints/src/fallible_impl_from.rs | 15 +++++++++++++-- clippy_lints/src/floating_point_arithmetic.rs | 2 -- clippy_lints/src/format.rs | 6 +++++- clippy_lints/src/functions.rs | 14 ++++++++++---- clippy_lints/src/implicit_saturating_sub.rs | 7 ------- clippy_lints/src/int_plus_one.rs | 1 - clippy_lints/src/integer_division.rs | 11 +++++++---- clippy_lints/src/items_after_statements.rs | 16 ++++++++++++++++ 8 files changed, 51 insertions(+), 21 deletions(-) diff --git a/clippy_lints/src/fallible_impl_from.rs b/clippy_lints/src/fallible_impl_from.rs index 17639cc2a..575462f25 100644 --- a/clippy_lints/src/fallible_impl_from.rs +++ b/clippy_lints/src/fallible_impl_from.rs @@ -18,13 +18,24 @@ declare_clippy_lint! { /// **Known problems:** None. /// /// **Example:** - /// ```rust + /// ```rust,ignore /// struct Foo(i32); + /// + /// // Bad /// impl From for Foo { /// fn from(s: String) -> Self { /// Foo(s.parse().unwrap()) /// } /// } + /// + /// // Good + /// use std::convert::TryFrom; + /// impl TryFrom for Foo { + /// type Error = (); + /// fn try_from(s: String) -> Result { + /// s.parse() + /// } + /// } /// ``` pub FALLIBLE_IMPL_FROM, nursery, @@ -120,7 +131,7 @@ fn lint_impl_body<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, impl_span: Span, impl_it move |diag| { diag.help( "`From` is intended for infallible conversions only. \ - Use `TryFrom` if there's a possibility for the conversion to fail."); + Use `TryFrom` if there's a possibility for the conversion to fail."); diag.span_note(fpu.result, "potential failure(s)"); }); } diff --git a/clippy_lints/src/floating_point_arithmetic.rs b/clippy_lints/src/floating_point_arithmetic.rs index 86317fb8b..3a912d928 100644 --- a/clippy_lints/src/floating_point_arithmetic.rs +++ b/clippy_lints/src/floating_point_arithmetic.rs @@ -28,7 +28,6 @@ declare_clippy_lint! { /// **Example:** /// /// ```rust - /// /// let a = 3f32; /// let _ = a.powf(1.0 / 3.0); /// let _ = (1.0 + a).ln(); @@ -38,7 +37,6 @@ declare_clippy_lint! { /// is better expressed as /// /// ```rust - /// /// let a = 3f32; /// let _ = a.cbrt(); /// let _ = a.ln_1p(); diff --git a/clippy_lints/src/format.rs b/clippy_lints/src/format.rs index 5b092526c..1530538aa 100644 --- a/clippy_lints/src/format.rs +++ b/clippy_lints/src/format.rs @@ -25,9 +25,13 @@ declare_clippy_lint! { /// /// **Examples:** /// ```rust + /// + /// // Bad /// # let foo = "foo"; - /// format!("foo"); /// format!("{}", foo); + /// + /// // Good + /// format!("foo"); /// ``` pub USELESS_FORMAT, complexity, diff --git a/clippy_lints/src/functions.rs b/clippy_lints/src/functions.rs index c24a24733..9b5f1dee7 100644 --- a/clippy_lints/src/functions.rs +++ b/clippy_lints/src/functions.rs @@ -49,11 +49,11 @@ declare_clippy_lint! { /// **Known problems:** None. /// /// **Example:** - /// ``` rust + /// ```rust /// fn im_too_long() { - /// println!(""); + /// println!(""); /// // ... 100 more LoC - /// println!(""); + /// println!(""); /// } /// ``` pub TOO_MANY_LINES, @@ -79,10 +79,16 @@ declare_clippy_lint! { /// `some_argument.get_raw_ptr()`). /// /// **Example:** - /// ```rust + /// ```rust,ignore + /// // Bad /// pub fn foo(x: *const u8) { /// println!("{}", unsafe { *x }); /// } + /// + /// // Good + /// pub unsafe fn foo(x: *const u8) { + /// println!("{}", unsafe { *x }); + /// } /// ``` pub NOT_UNSAFE_PTR_ARG_DEREF, correctness, diff --git a/clippy_lints/src/implicit_saturating_sub.rs b/clippy_lints/src/implicit_saturating_sub.rs index 155a93de4..fdaf37e5e 100644 --- a/clippy_lints/src/implicit_saturating_sub.rs +++ b/clippy_lints/src/implicit_saturating_sub.rs @@ -25,13 +25,6 @@ declare_clippy_lint! { /// if i != 0 { /// i -= 1; /// } - /// ``` - /// Use instead: - /// ```rust - /// let end: u32 = 10; - /// let start: u32 = 5; - /// - /// let mut i: u32 = end - start; /// /// // Good /// i = i.saturating_sub(1); diff --git a/clippy_lints/src/int_plus_one.rs b/clippy_lints/src/int_plus_one.rs index d5dbd4956..e91fb0c2f 100644 --- a/clippy_lints/src/int_plus_one.rs +++ b/clippy_lints/src/int_plus_one.rs @@ -10,7 +10,6 @@ use crate::utils::{snippet_opt, span_lint_and_sugg}; declare_clippy_lint! { /// **What it does:** Checks for usage of `x >= y + 1` or `x - 1 >= y` (and `<=`) in a block /// - /// /// **Why is this bad?** Readability -- better to use `> y` instead of `>= y + 1`. /// /// **Known problems:** None. diff --git a/clippy_lints/src/integer_division.rs b/clippy_lints/src/integer_division.rs index fe34d33fe..d537ef3f3 100644 --- a/clippy_lints/src/integer_division.rs +++ b/clippy_lints/src/integer_division.rs @@ -15,10 +15,13 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust - /// fn main() { - /// let x = 3 / 2; - /// println!("{}", x); - /// } + /// // Bad + /// let x = 3 / 2; + /// println!("{}", x); + /// + /// // Good + /// let x = 3f32 / 2f32; + /// println!("{}", x); /// ``` pub INTEGER_DIVISION, restriction, diff --git a/clippy_lints/src/items_after_statements.rs b/clippy_lints/src/items_after_statements.rs index e7062b7c1..c8576bcfc 100644 --- a/clippy_lints/src/items_after_statements.rs +++ b/clippy_lints/src/items_after_statements.rs @@ -16,6 +16,7 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// // Bad /// fn foo() { /// println!("cake"); /// } @@ -28,6 +29,21 @@ declare_clippy_lint! { /// foo(); // prints "foo" /// } /// ``` + /// + /// ```rust + /// // Good + /// fn foo() { + /// println!("cake"); + /// } + /// + /// fn main() { + /// fn foo() { + /// println!("foo"); + /// } + /// foo(); // prints "foo" + /// foo(); // prints "foo" + /// } + /// ``` pub ITEMS_AFTER_STATEMENTS, pedantic, "blocks where an item comes after a statement" From 19339334cb4e9c6db5a1f7dced38edcb16707bc7 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sun, 31 May 2020 11:38:48 +0200 Subject: [PATCH 0163/4780] Give more corrected code examples in doc --- clippy_lints/src/literal_representation.rs | 12 +++++ clippy_lints/src/matches.rs | 44 ++++++++++++++++--- clippy_lints/src/misc.rs | 31 ++++++++++++- clippy_lints/src/misc_early.rs | 34 +++++++++++--- clippy_lints/src/mut_reference.rs | 4 ++ clippy_lints/src/mutex_atomic.rs | 12 ++++- clippy_lints/src/needless_bool.rs | 3 +- clippy_lints/src/needless_borrow.rs | 8 +++- clippy_lints/src/needless_pass_by_value.rs | 3 +- clippy_lints/src/needless_update.rs | 10 +++++ clippy_lints/src/ptr.rs | 23 ++++++---- clippy_lints/src/question_mark.rs | 2 +- clippy_lints/src/reference.rs | 5 +++ clippy_lints/src/regex.rs | 12 ++--- clippy_lints/src/shadow.rs | 10 +++++ .../src/single_component_path_imports.rs | 4 +- .../src/slow_vector_initialization.rs | 8 +++- clippy_lints/src/strings.rs | 8 ++++ 18 files changed, 195 insertions(+), 38 deletions(-) diff --git a/clippy_lints/src/literal_representation.rs b/clippy_lints/src/literal_representation.rs index ec7c4531e..7ba43562d 100644 --- a/clippy_lints/src/literal_representation.rs +++ b/clippy_lints/src/literal_representation.rs @@ -24,7 +24,11 @@ declare_clippy_lint! { /// **Example:** /// /// ```rust + /// // Bad /// let x: u64 = 61864918973511; + /// + /// // Good + /// let x: u64 = 61_864_918_973_511; /// ``` pub UNREADABLE_LITERAL, pedantic, @@ -44,7 +48,11 @@ declare_clippy_lint! { /// **Example:** /// /// ```rust + /// // Probably mistyped /// 2_32; + /// + /// // Good + /// 2_i32; /// ``` pub MISTYPED_LITERAL_SUFFIXES, correctness, @@ -63,7 +71,11 @@ declare_clippy_lint! { /// **Example:** /// /// ```rust + /// // Bad /// let x: u64 = 618_64_9189_73_511; + /// + /// // Good + /// let x: u64 = 61_864_918_973_511; /// ``` pub INCONSISTENT_DIGIT_GROUPING, style, diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs index 94380acfc..146212cb2 100644 --- a/clippy_lints/src/matches.rs +++ b/clippy_lints/src/matches.rs @@ -36,10 +36,17 @@ declare_clippy_lint! { /// ```rust /// # fn bar(stool: &str) {} /// # let x = Some("abc"); + /// + /// // Bad /// match x { /// Some(ref foo) => bar(foo), /// _ => (), /// } + /// + /// // Good + /// if let Some(ref foo) = x { + /// bar(foo); + /// } /// ``` pub SINGLE_MATCH, style, @@ -97,11 +104,19 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust,ignore + /// // Bad /// match x { /// &A(ref y) => foo(y), /// &B => bar(), /// _ => frob(&x), /// } + /// + /// // Good + /// match *x { + /// A(ref y) => foo(y), + /// B => bar(), + /// _ => frob(x), + /// } /// ``` pub MATCH_REF_PATS, style, @@ -197,10 +212,15 @@ declare_clippy_lint! { /// **Example:** /// ```rust /// let x: Option<()> = None; + /// + /// // Bad /// let r: Option<&()> = match x { /// None => None, /// Some(ref v) => Some(v), /// }; + /// + /// // Good + /// let r: Option<&()> = x.as_ref(); /// ``` pub MATCH_AS_REF, complexity, @@ -219,10 +239,18 @@ declare_clippy_lint! { /// ```rust /// # enum Foo { A(usize), B(usize) } /// # let x = Foo::B(1); + /// + /// // Bad /// match x { /// Foo::A(_) => {}, /// _ => {}, /// } + /// + /// // Good + /// match x { + /// Foo::A(_) => {}, + /// Foo::B(_) => {}, + /// } /// ``` pub WILDCARD_ENUM_MATCH_ARM, restriction, @@ -242,16 +270,15 @@ declare_clippy_lint! { /// ```rust /// # enum Foo { A, B, C } /// # let x = Foo::B; + /// + /// // Bad /// match x { /// Foo::A => {}, /// Foo::B => {}, /// _ => {}, /// } - /// ``` - /// Use instead: - /// ```rust - /// # enum Foo { A, B, C } - /// # let x = Foo::B; + /// + /// // Good /// match x { /// Foo::A => {}, /// Foo::B => {}, @@ -273,10 +300,17 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// // Bad /// match "foo" { /// "a" => {}, /// "bar" | _ => {}, /// } + /// + /// // Good + /// match "foo" { + /// "a" => {}, + /// _ => {}, + /// } /// ``` pub WILDCARD_IN_OR_PATTERNS, complexity, diff --git a/clippy_lints/src/misc.rs b/clippy_lints/src/misc.rs index e1d524c22..a3b7134a3 100644 --- a/clippy_lints/src/misc.rs +++ b/clippy_lints/src/misc.rs @@ -38,10 +38,16 @@ declare_clippy_lint! { /// dereferences, e.g., changing `*x` to `x` within the function. /// /// **Example:** - /// ```rust + /// ```rust,ignore + /// // Bad /// fn foo(ref x: u8) -> bool { /// true /// } + /// + /// // Good + /// fn foo(x: &u8) -> bool { + /// true + /// } /// ``` pub TOPLEVEL_REF_ARG, style, @@ -60,7 +66,11 @@ declare_clippy_lint! { /// ```rust /// # let x = 1.0; /// + /// // Bad /// if x == f32::NAN { } + /// + /// // Good + /// if x.is_nan() { } /// ``` pub CMP_NAN, correctness, @@ -83,8 +93,15 @@ declare_clippy_lint! { /// ```rust /// let x = 1.2331f64; /// let y = 1.2332f64; + /// + /// // Bad /// if y == 1.23f64 { } /// if y != x {} // where both are floats + /// + /// // Good + /// let error = 0.01f64; // Use an epsilon for comparison + /// if (y - 1.23f64).abs() < error { } + /// if (y - x).abs() > error { } /// ``` pub FLOAT_CMP, correctness, @@ -191,7 +208,11 @@ declare_clippy_lint! { /// **Example:** /// /// ```rust + /// // Bad /// let a = 0 as *const u32; + /// + /// // Good + /// let a = std::ptr::null::(); /// ``` pub ZERO_PTR, style, @@ -214,7 +235,13 @@ declare_clippy_lint! { /// ```rust /// let x: f64 = 1.0; /// const ONE: f64 = 1.00; - /// x == ONE; // where both are floats + /// + /// // Bad + /// if x == ONE { } // where both are floats + /// + /// // Good + /// let error = 0.1f64; // Use an epsilon for comparison + /// if (x - ONE).abs() < error { } /// ``` pub FLOAT_CMP_CONST, restriction, diff --git a/clippy_lints/src/misc_early.rs b/clippy_lints/src/misc_early.rs index 552222eba..ad39e59d0 100644 --- a/clippy_lints/src/misc_early.rs +++ b/clippy_lints/src/misc_early.rs @@ -59,7 +59,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// // Bad /// fn foo(a: i32, _a: i32) {} + /// + /// // Good + /// fn bar(a: i32, _b: i32) {} /// ``` pub DUPLICATE_UNDERSCORE_ARGUMENT, style, @@ -77,7 +81,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust,ignore - /// (|| 42)() + /// // Bad + /// let a = (|| 42)() + /// + /// // Good + /// let a = 42 /// ``` pub REDUNDANT_CLOSURE_CALL, complexity, @@ -112,7 +120,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// // Bad /// let y = 0x1a9BAcD; + /// + /// // Good + /// let y = 0x1A9BACD; /// ``` pub MIXED_CASE_HEX_LITERALS, style, @@ -129,7 +141,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// // Bad /// let y = 123832i32; + /// + /// // Good + /// let y = 123832_i32; /// ``` pub UNSEPARATED_LITERAL_SUFFIX, pedantic, @@ -207,9 +223,16 @@ declare_clippy_lint! { /// ```rust /// # let v = Some("abc"); /// + /// // Bad /// match v { /// Some(x) => (), - /// y @ _ => (), // easier written as `y`, + /// y @ _ => (), + /// } + /// + /// // Good + /// match v { + /// Some(x) => (), + /// y => (), /// } /// ``` pub REDUNDANT_PATTERN, @@ -235,16 +258,13 @@ declare_clippy_lint! { /// # struct TupleStruct(u32, u32, u32); /// # let t = TupleStruct(1, 2, 3); /// + /// // Bad /// match t { /// TupleStruct(0, .., _) => (), /// _ => (), /// } - /// ``` - /// can be written as - /// ```rust - /// # struct TupleStruct(u32, u32, u32); - /// # let t = TupleStruct(1, 2, 3); /// + /// // Good /// match t { /// TupleStruct(0, ..) => (), /// _ => (), diff --git a/clippy_lints/src/mut_reference.rs b/clippy_lints/src/mut_reference.rs index 67a1ac78a..58a8e1a10 100644 --- a/clippy_lints/src/mut_reference.rs +++ b/clippy_lints/src/mut_reference.rs @@ -16,7 +16,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```ignore + /// // Bad /// my_vec.push(&mut value) + /// + /// // Good + /// my_vec.push(&value) /// ``` pub UNNECESSARY_MUT_PASSED, style, diff --git a/clippy_lints/src/mutex_atomic.rs b/clippy_lints/src/mutex_atomic.rs index 4e1a8be48..78b15afc5 100644 --- a/clippy_lints/src/mutex_atomic.rs +++ b/clippy_lints/src/mutex_atomic.rs @@ -22,9 +22,15 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// # let y = true; + /// + /// // Bad /// # use std::sync::Mutex; - /// # let y = 1; /// let x = Mutex::new(&y); + /// + /// // Good + /// # use std::sync::atomic::AtomicBool; + /// let x = AtomicBool::new(y); /// ``` pub MUTEX_ATOMIC, perf, @@ -46,6 +52,10 @@ declare_clippy_lint! { /// ```rust /// # use std::sync::Mutex; /// let x = Mutex::new(0usize); + /// + /// // Good + /// # use std::sync::atomic::AtomicUsize; + /// let x = AtomicUsize::new(0usize); /// ``` pub MUTEX_INTEGER, nursery, diff --git a/clippy_lints/src/needless_bool.rs b/clippy_lints/src/needless_bool.rs index efa77db82..15b129fa0 100644 --- a/clippy_lints/src/needless_bool.rs +++ b/clippy_lints/src/needless_bool.rs @@ -15,8 +15,7 @@ use rustc_span::Span; declare_clippy_lint! { /// **What it does:** Checks for expressions of the form `if c { true } else { - /// false }` - /// (or vice versa) and suggest using the condition directly. + /// false }` (or vice versa) and suggests using the condition directly. /// /// **Why is this bad?** Redundant code. /// diff --git a/clippy_lints/src/needless_borrow.rs b/clippy_lints/src/needless_borrow.rs index 9ee875d75..5880d1d61 100644 --- a/clippy_lints/src/needless_borrow.rs +++ b/clippy_lints/src/needless_borrow.rs @@ -18,12 +18,16 @@ declare_clippy_lint! { /// **Why is this bad?** Suggests that the receiver of the expression borrows /// the expression. /// + /// **Known problems:** None. + /// /// **Example:** /// ```rust + /// // Bad /// let x: &i32 = &&&&&&5; - /// ``` /// - /// **Known problems:** None. + /// // Good + /// let x: &i32 = &5; + /// ``` pub NEEDLESS_BORROW, nursery, "taking a reference that is going to be automatically dereferenced" diff --git a/clippy_lints/src/needless_pass_by_value.rs b/clippy_lints/src/needless_pass_by_value.rs index 9c508fc0e..fbdf927b8 100644 --- a/clippy_lints/src/needless_pass_by_value.rs +++ b/clippy_lints/src/needless_pass_by_value.rs @@ -40,9 +40,8 @@ declare_clippy_lint! { /// assert_eq!(v.len(), 42); /// } /// ``` - /// + /// should be /// ```rust - /// // should be /// fn foo(v: &[i32]) { /// assert_eq!(v.len(), 42); /// } diff --git a/clippy_lints/src/needless_update.rs b/clippy_lints/src/needless_update.rs index 4b2586877..d866bab2f 100644 --- a/clippy_lints/src/needless_update.rs +++ b/clippy_lints/src/needless_update.rs @@ -21,6 +21,16 @@ declare_clippy_lint! { /// # z: i32, /// # } /// # let zero_point = Point { x: 0, y: 0, z: 0 }; + /// + /// // Bad + /// Point { + /// x: 1, + /// y: 1, + /// z: 1, + /// ..zero_point + /// }; + /// + /// // Ok /// Point { /// x: 1, /// y: 1, diff --git a/clippy_lints/src/ptr.rs b/clippy_lints/src/ptr.rs index 4eac571f9..c77b44e0c 100644 --- a/clippy_lints/src/ptr.rs +++ b/clippy_lints/src/ptr.rs @@ -47,7 +47,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```ignore + /// // Bad /// fn foo(&Vec) { .. } + /// + /// // Good + /// fn foo(&[u32]) { .. } /// ``` pub PTR_ARG, style, @@ -65,9 +69,15 @@ declare_clippy_lint! { /// /// **Example:** /// ```ignore + /// // Bad /// if x == ptr::null { /// .. /// } + /// + /// // Good + /// if x.is_null() { + /// .. + /// } /// ``` pub CMP_NULL, style, @@ -76,19 +86,16 @@ declare_clippy_lint! { declare_clippy_lint! { /// **What it does:** This lint checks for functions that take immutable - /// references and return - /// mutable ones. + /// references and return mutable ones. /// /// **Why is this bad?** This is trivially unsound, as one can create two - /// mutable references - /// from the same (immutable!) source. This - /// [error](https://github.com/rust-lang/rust/issues/39465) + /// mutable references from the same (immutable!) source. + /// This [error](https://github.com/rust-lang/rust/issues/39465) /// actually lead to an interim Rust release 1.15.1. /// /// **Known problems:** To be on the conservative side, if there's at least one - /// mutable reference - /// with the output lifetime, this lint will not trigger. In practice, this - /// case is unlikely anyway. + /// mutable reference with the output lifetime, this lint will not trigger. + /// In practice, this case is unlikely anyway. /// /// **Example:** /// ```ignore diff --git a/clippy_lints/src/question_mark.rs b/clippy_lints/src/question_mark.rs index ea654467b..e4361b00f 100644 --- a/clippy_lints/src/question_mark.rs +++ b/clippy_lints/src/question_mark.rs @@ -88,7 +88,7 @@ impl QuestionMark { replacement_str, applicability, ) - } + } } } } diff --git a/clippy_lints/src/reference.rs b/clippy_lints/src/reference.rs index d5797468e..fe457aad5 100644 --- a/clippy_lints/src/reference.rs +++ b/clippy_lints/src/reference.rs @@ -16,8 +16,13 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust,ignore + /// // Bad /// let a = f(*&mut b); /// let c = *&d; + /// + /// // Good + /// let a = f(b); + /// let c = d; /// ``` pub DEREF_ADDROF, complexity, diff --git a/clippy_lints/src/regex.rs b/clippy_lints/src/regex.rs index 30084e3e1..a2c35c426 100644 --- a/clippy_lints/src/regex.rs +++ b/clippy_lints/src/regex.rs @@ -86,11 +86,13 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Regex { if let Some(span) = is_expn_of(expr.span, "regex"); then { if !self.spans.contains(&span) { - span_lint(cx, - REGEX_MACRO, - span, - "`regex!(_)` found. \ - Please use `Regex::new(_)`, which is faster for now."); + span_lint( + cx, + REGEX_MACRO, + span, + "`regex!(_)` found. \ + Please use `Regex::new(_)`, which is faster for now." + ); self.spans.insert(span); } self.last = Some(block.hir_id); diff --git a/clippy_lints/src/shadow.rs b/clippy_lints/src/shadow.rs index 11360b0ef..68c36f918 100644 --- a/clippy_lints/src/shadow.rs +++ b/clippy_lints/src/shadow.rs @@ -25,7 +25,12 @@ declare_clippy_lint! { /// **Example:** /// ```rust /// # let x = 1; + /// + /// // Bad /// let x = &x; + /// + /// // Good + /// let y = &x; // use different variable name /// ``` pub SHADOW_SAME, restriction, @@ -77,7 +82,12 @@ declare_clippy_lint! { /// # let y = 1; /// # let z = 2; /// let x = y; + /// + /// // Bad /// let x = z; // shadows the earlier binding + /// + /// // Good + /// let w = z; // use different variable name /// ``` pub SHADOW_UNRELATED, pedantic, diff --git a/clippy_lints/src/single_component_path_imports.rs b/clippy_lints/src/single_component_path_imports.rs index 8d767a7fe..2e853e830 100644 --- a/clippy_lints/src/single_component_path_imports.rs +++ b/clippy_lints/src/single_component_path_imports.rs @@ -16,7 +16,7 @@ declare_clippy_lint! { /// /// **Example:** /// - /// ```rust, ignore + /// ```rust,ignore /// use regex; /// /// fn main() { @@ -24,7 +24,7 @@ declare_clippy_lint! { /// } /// ``` /// Better as - /// ```rust, ignore + /// ```rust,ignore /// fn main() { /// regex::Regex::new(r"^\d{4}-\d{2}-\d{2}$").unwrap(); /// } diff --git a/clippy_lints/src/slow_vector_initialization.rs b/clippy_lints/src/slow_vector_initialization.rs index fb3706be1..a7c4f2c22 100644 --- a/clippy_lints/src/slow_vector_initialization.rs +++ b/clippy_lints/src/slow_vector_initialization.rs @@ -22,11 +22,17 @@ declare_clippy_lint! { /// ```rust /// # use core::iter::repeat; /// # let len = 4; + /// + /// // Bad /// let mut vec1 = Vec::with_capacity(len); /// vec1.resize(len, 0); /// /// let mut vec2 = Vec::with_capacity(len); - /// vec2.extend(repeat(0).take(len)) + /// vec2.extend(repeat(0).take(len)); + /// + /// // Good + /// let mut vec1 = vec![0; len]; + /// let mut vec2 = vec![0; len]; /// ``` pub SLOW_VECTOR_INITIALIZATION, perf, diff --git a/clippy_lints/src/strings.rs b/clippy_lints/src/strings.rs index 2c51271e3..f84566ef7 100644 --- a/clippy_lints/src/strings.rs +++ b/clippy_lints/src/strings.rs @@ -24,6 +24,10 @@ declare_clippy_lint! { /// ```rust /// let mut x = "Hello".to_owned(); /// x = x + ", World"; + /// + /// // More readable + /// x += ", World"; + /// x.push_str(", World"); /// ``` pub STRING_ADD_ASSIGN, pedantic, @@ -69,7 +73,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// // Bad /// let bs = "a byte string".as_bytes(); + /// + /// // Good + /// let bs = b"a byte string"; /// ``` pub STRING_LIT_AS_BYTES, style, From 9893254dff38c2644612c8465ae9abfa553f4ea3 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sun, 31 May 2020 12:08:41 +0200 Subject: [PATCH 0164/4780] Add more corrected code for doc --- clippy_lints/src/methods/mod.rs | 65 ++++++++++++++++++++------ clippy_lints/src/misc.rs | 2 +- clippy_lints/src/vec.rs | 10 +++- clippy_lints/src/verbose_file_reads.rs | 1 + clippy_lints/src/wildcard_imports.rs | 12 +++-- clippy_lints/src/write.rs | 22 ++++++++- clippy_lints/src/zero_div_zero.rs | 6 ++- src/lintlist/mod.rs | 2 +- 8 files changed, 95 insertions(+), 25 deletions(-) diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index 52ca962e7..fbc29efde 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -218,7 +218,12 @@ declare_clippy_lint! { /// **Example:** /// ```rust /// # let x = Ok::<_, ()>(()); - /// x.ok().expect("why did I do this again?") + /// + /// // Bad + /// x.ok().expect("why did I do this again?"); + /// + /// // Good + /// x.expect("why did I do this again?"); /// ``` pub OK_EXPECT, style, @@ -273,8 +278,12 @@ declare_clippy_lint! { /// **Example:** /// ```rust /// # let opt = Some(1); - /// opt.map_or(None, |a| Some(a + 1)) - /// # ; + /// + /// // Bad + /// opt.map_or(None, |a| Some(a + 1)); + /// + /// // Good + /// opt.and_then(|a| Some(a + 1)); /// ``` pub OPTION_MAP_OR_NONE, style, @@ -390,14 +399,19 @@ declare_clippy_lint! { /// **What it does:** Checks for usage of `_.map(_).flatten(_)`, /// /// **Why is this bad?** Readability, this can be written more concisely as a - /// single method call. + /// single method call using `_.flat_map(_)` /// /// **Known problems:** /// /// **Example:** /// ```rust /// let vec = vec![vec![1]]; + /// + /// // Bad /// vec.iter().map(|x| x.iter()).flatten(); + /// + /// // Good + /// vec.iter().flat_map(|x| x.iter()); /// ``` pub MAP_FLATTEN, pedantic, @@ -417,7 +431,12 @@ declare_clippy_lint! { /// **Example:** /// ```rust /// let vec = vec![1]; + /// + /// // Bad /// vec.iter().filter(|x| **x == 0).map(|x| *x * 2); + /// + /// // Good + /// vec.iter().filter_map(|x| Some(*x * 2)); /// ``` pub FILTER_MAP, pedantic, @@ -634,7 +653,12 @@ declare_clippy_lint! { /// ```rust /// # use std::rc::Rc; /// let x = Rc::new(1); + /// + /// // Bad /// x.clone(); + /// + /// // Good + /// Rc::clone(&x); /// ``` pub CLONE_ON_REF_PTR, restriction, @@ -741,7 +765,12 @@ declare_clippy_lint! { /// **Known problems:** Does not catch multi-byte unicode characters. /// /// **Example:** - /// `_.split("x")` could be `_.split('x')` + /// ```rust,ignore + /// // Bad + /// _.split("x"); + /// + /// // Good + /// _.split('x'); pub SINGLE_CHAR_PATTERN, perf, "using a single-character str where a char could be used, e.g., `_.split(\"x\")`" @@ -964,8 +993,8 @@ declare_clippy_lint! { } declare_clippy_lint! { - /// **What it does:** Checks for usage of `.chars().last()` or - /// `.chars().next_back()` on a `str` to check if it ends with a given char. + /// **What it does:** Checks for usage of `_.chars().last()` or + /// `_.chars().next_back()` on a `str` to check if it ends with a given char. /// /// **Why is this bad?** Readability, this can be written more concisely as /// `_.ends_with(_)`. @@ -975,8 +1004,12 @@ declare_clippy_lint! { /// **Example:** /// ```rust /// # let name = "_"; - /// name.chars().last() == Some('_') || name.chars().next_back() == Some('-') - /// # ; + /// + /// // Bad + /// name.chars().last() == Some('_') || name.chars().next_back() == Some('-'); + /// + /// // Good + /// name.ends_with('_') || name.ends_with('-'); /// ``` pub CHARS_LAST_CMP, style, @@ -1044,17 +1077,15 @@ declare_clippy_lint! { /// **Example:** /// ```rust /// let _ = (0..3).filter_map(|x| if x > 2 { Some(x) } else { None }); - /// ``` - /// As there is no transformation of the argument this could be written as: - /// ```rust + /// + /// // As there is no transformation of the argument this could be written as: /// let _ = (0..3).filter(|&x| x > 2); /// ``` /// /// ```rust /// let _ = (0..4).filter_map(|x| Some(x + 1)); - /// ``` - /// As there is no conditional check on the argument this could be written as: - /// ```rust + /// + /// // As there is no conditional check on the argument this could be written as: /// let _ = (0..4).map(|x| x + 1); /// ``` pub UNNECESSARY_FILTER_MAP, @@ -1075,7 +1106,11 @@ declare_clippy_lint! { /// **Example:** /// /// ```rust + /// // Bad /// let _ = (&vec![3, 4, 5]).into_iter(); + /// + /// // Good + /// let _ = (&vec![3, 4, 5]).iter(); /// ``` pub INTO_ITER_ON_REF, style, diff --git a/clippy_lints/src/misc.rs b/clippy_lints/src/misc.rs index a3b7134a3..51282ab93 100644 --- a/clippy_lints/src/misc.rs +++ b/clippy_lints/src/misc.rs @@ -93,7 +93,7 @@ declare_clippy_lint! { /// ```rust /// let x = 1.2331f64; /// let y = 1.2332f64; - /// + /// /// // Bad /// if y == 1.23f64 { } /// if y != x {} // where both are floats diff --git a/clippy_lints/src/vec.rs b/clippy_lints/src/vec.rs index 1174f4215..a8d4c7620 100644 --- a/clippy_lints/src/vec.rs +++ b/clippy_lints/src/vec.rs @@ -17,8 +17,14 @@ declare_clippy_lint! { /// **Known problems:** None. /// /// **Example:** - /// ```rust,ignore - /// foo(&vec![1, 2]) + /// ```rust + /// # fn foo(my_vec: &[u8]) {} + /// + /// // Bad + /// foo(&vec![1, 2]); + /// + /// // Good + /// foo(&[1, 2]); /// ``` pub USELESS_VEC, perf, diff --git a/clippy_lints/src/verbose_file_reads.rs b/clippy_lints/src/verbose_file_reads.rs index 4d8d4438d..7247518e1 100644 --- a/clippy_lints/src/verbose_file_reads.rs +++ b/clippy_lints/src/verbose_file_reads.rs @@ -9,6 +9,7 @@ declare_clippy_lint! { /// /// **Why is this bad?** `fs::{read, read_to_string}` provide the same functionality when `buf` is empty with fewer imports and no intermediate values. /// See also: [fs::read docs](https://doc.rust-lang.org/std/fs/fn.read.html), [fs::read_to_string docs](https://doc.rust-lang.org/std/fs/fn.read_to_string.html) + /// /// **Known problems:** None. /// /// **Example:** diff --git a/clippy_lints/src/wildcard_imports.rs b/clippy_lints/src/wildcard_imports.rs index 32d9a45c3..b637253bd 100644 --- a/clippy_lints/src/wildcard_imports.rs +++ b/clippy_lints/src/wildcard_imports.rs @@ -19,8 +19,14 @@ declare_clippy_lint! { /// still around. /// /// **Example:** - /// ```rust + /// ```rust,ignore + /// // Bad /// use std::cmp::Ordering::*; + /// foo(Less); + /// + /// // Good + /// use std::cmp::Ordering; + /// foo(Ordering::Less) /// ``` pub ENUM_GLOB_USE, pedantic, @@ -60,15 +66,15 @@ declare_clippy_lint! { /// /// **Example:** /// - /// Bad: /// ```rust,ignore + /// // Bad /// use crate1::*; /// /// foo(); /// ``` /// - /// Good: /// ```rust,ignore + /// // Good /// use crate1::foo; /// /// foo(); diff --git a/clippy_lints/src/write.rs b/clippy_lints/src/write.rs index 5f7945980..22ce484b2 100644 --- a/clippy_lints/src/write.rs +++ b/clippy_lints/src/write.rs @@ -23,7 +23,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust + /// // Bad /// println!(""); + /// + /// // Good + /// println!(); /// ``` pub PRINTLN_EMPTY_STRING, style, @@ -32,8 +36,7 @@ declare_clippy_lint! { declare_clippy_lint! { /// **What it does:** This lint warns when you use `print!()` with a format - /// string that - /// ends in a newline. + /// string that ends in a newline. /// /// **Why is this bad?** You should use `println!()` instead, which appends the /// newline. @@ -125,7 +128,12 @@ declare_clippy_lint! { /// ```rust /// # use std::fmt::Write; /// # let mut buf = String::new(); + /// + /// // Bad /// writeln!(buf, ""); + /// + /// // Good + /// writeln!(buf); /// ``` pub WRITELN_EMPTY_STRING, style, @@ -147,7 +155,12 @@ declare_clippy_lint! { /// # use std::fmt::Write; /// # let mut buf = String::new(); /// # let name = "World"; + /// + /// // Bad /// write!(buf, "Hello {}!\n", name); + /// + /// // Good + /// writeln!(buf, "Hello {}!", name); /// ``` pub WRITE_WITH_NEWLINE, style, @@ -168,7 +181,12 @@ declare_clippy_lint! { /// ```rust /// # use std::fmt::Write; /// # let mut buf = String::new(); + /// + /// // Bad /// writeln!(buf, "{}", "foo"); + /// + /// // Good + /// writeln!(buf, "foo"); /// ``` pub WRITE_LITERAL, style, diff --git a/clippy_lints/src/zero_div_zero.rs b/clippy_lints/src/zero_div_zero.rs index fb4700d87..0820385e0 100644 --- a/clippy_lints/src/zero_div_zero.rs +++ b/clippy_lints/src/zero_div_zero.rs @@ -14,7 +14,11 @@ declare_clippy_lint! { /// /// **Example:** /// ```rust - /// 0.0f32 / 0.0; + /// // Bad + /// let nan = 0.0f32 / 0.0; + /// + /// // Good + /// let nan = f32::NAN; /// ``` pub ZERO_DIVIDED_BY_ZERO, complexity, diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index ab9542a7b..6b6e2c732 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1735,7 +1735,7 @@ pub static ref ALL_LINTS: Vec = vec![ Lint { name: "pub_enum_variant_names", group: "pedantic", - desc: "enums where all variants share a prefix/postfix", + desc: "public enums where all variants share a prefix/postfix", deprecation: None, module: "enum_variants", }, From 137a3b4d3242cfe331f8f9b87c51ac0c431fe160 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Mon, 1 Jun 2020 10:16:01 +0200 Subject: [PATCH 0165/4780] Corrected doc PR fixes --- clippy_lints/src/drop_bounds.rs | 2 +- clippy_lints/src/eta_reduction.rs | 2 +- clippy_lints/src/eval_order_dependence.rs | 7 +++++-- clippy_lints/src/fallible_impl_from.rs | 12 ++++++++++-- clippy_lints/src/functions.rs | 2 +- clippy_lints/src/methods/mod.rs | 6 +++++- 6 files changed, 23 insertions(+), 8 deletions(-) diff --git a/clippy_lints/src/drop_bounds.rs b/clippy_lints/src/drop_bounds.rs index 4ef963ac3..5a7f75948 100644 --- a/clippy_lints/src/drop_bounds.rs +++ b/clippy_lints/src/drop_bounds.rs @@ -29,7 +29,7 @@ declare_clippy_lint! { /// ``` /// Could be written as: /// ```rust - /// fn foo() {} + /// fn foo() {} /// ``` pub DROP_BOUNDS, correctness, diff --git a/clippy_lints/src/eta_reduction.rs b/clippy_lints/src/eta_reduction.rs index 5f0cd1ec7..d093025fd 100644 --- a/clippy_lints/src/eta_reduction.rs +++ b/clippy_lints/src/eta_reduction.rs @@ -30,7 +30,7 @@ declare_clippy_lint! { /// xs.map(|x| foo(x)) /// /// // Good - /// foo(xs) + /// xs.map(foo) /// ``` /// where `foo(_)` is a plain function that takes the exact argument type of /// `x`. diff --git a/clippy_lints/src/eval_order_dependence.rs b/clippy_lints/src/eval_order_dependence.rs index 37e24ff34..74144fb29 100644 --- a/clippy_lints/src/eval_order_dependence.rs +++ b/clippy_lints/src/eval_order_dependence.rs @@ -30,8 +30,11 @@ declare_clippy_lint! { /// // Unclear whether a is 1 or 2. /// /// // Good - /// x = 1; - /// let a = 1 + x; + /// let tmp = { + /// x = 1; + /// 1 + /// }; + /// let a = tmp + x; /// ``` pub EVAL_ORDER_DEPENDENCE, complexity, diff --git a/clippy_lints/src/fallible_impl_from.rs b/clippy_lints/src/fallible_impl_from.rs index 575462f25..928128164 100644 --- a/clippy_lints/src/fallible_impl_from.rs +++ b/clippy_lints/src/fallible_impl_from.rs @@ -18,7 +18,7 @@ declare_clippy_lint! { /// **Known problems:** None. /// /// **Example:** - /// ```rust,ignore + /// ```rust /// struct Foo(i32); /// /// // Bad @@ -27,13 +27,21 @@ declare_clippy_lint! { /// Foo(s.parse().unwrap()) /// } /// } + /// ``` /// + /// ```rust /// // Good + /// struct Foo(i32); + /// /// use std::convert::TryFrom; /// impl TryFrom for Foo { /// type Error = (); /// fn try_from(s: String) -> Result { - /// s.parse() + /// if let Ok(parsed) = s.parse() { + /// Ok(Foo(parsed)) + /// } else { + /// Err(()) + /// } /// } /// } /// ``` diff --git a/clippy_lints/src/functions.rs b/clippy_lints/src/functions.rs index 9b5f1dee7..325b6cf32 100644 --- a/clippy_lints/src/functions.rs +++ b/clippy_lints/src/functions.rs @@ -52,7 +52,7 @@ declare_clippy_lint! { /// ```rust /// fn im_too_long() { /// println!(""); - /// // ... 100 more LoC + /// // ... 100 more LoC /// println!(""); /// } /// ``` diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index fbc29efde..a8d5c10d5 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -436,7 +436,11 @@ declare_clippy_lint! { /// vec.iter().filter(|x| **x == 0).map(|x| *x * 2); /// /// // Good - /// vec.iter().filter_map(|x| Some(*x * 2)); + /// vec.iter().filter_map(|x| if *x == 0 { + /// Some(*x * 2) + /// } else { + /// None + /// }); /// ``` pub FILTER_MAP, pedantic, From 9e89ba93fda29b4dc707cd14bd518b73e676d895 Mon Sep 17 00:00:00 2001 From: ThibsG Date: Sun, 31 May 2020 15:09:58 +0200 Subject: [PATCH 0166/4780] Add doc for checking if type defines certain method --- doc/common_tools_writing_lints.md | 48 +++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/doc/common_tools_writing_lints.md b/doc/common_tools_writing_lints.md index ed33b37c6..dbc434505 100644 --- a/doc/common_tools_writing_lints.md +++ b/doc/common_tools_writing_lints.md @@ -4,7 +4,9 @@ You may need following tooltips to catch up with common operations. - [Common tools for writing lints](#common-tools-for-writing-lints) - [Retrieving the type of an expression](#retrieving-the-type-of-an-expression) + - [Checking if an expression is calling a specific method](#checking-if-an-expr-is-calling-a-specific-method) - [Checking if a type implements a specific trait](#checking-if-a-type-implements-a-specific-trait) + - [Checking if a type defines a method](#checking-if-a-type-defines-a-method) - [Dealing with macros](#dealing-with-macros) Useful Rustc dev guide links: @@ -49,6 +51,26 @@ Two noticeable items here: - `tables` is [`TypeckTables`][TypeckTables] and is created by type checking step, it includes useful information such as types of expressions, ways to resolve methods and so on. +# Checking if an expr is calling a specific method + +Starting with an `expr`, you can check whether it is calling a specific method `some_method`: + +```rust +impl LateLintPass<'_, '_> for MyStructLint { + fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr<'_>) { + if_chain! { + // Check our expr is calling a method + if let hir::ExprKind::MethodCall(path, _, _args) = &expr.kind; + // Check the name of this method is `some_method` + if path.ident.name == sym!(some_method); + then { + // ... + } + } + } +} +``` + # Checking if a type implements a specific trait There are two ways to do this, depending if the target trait is part of lang items. @@ -83,6 +105,32 @@ A list of defined paths for Clippy can be found in [paths.rs][paths] We access lang items through the type context `tcx`. `tcx` is of type [`TyCtxt`][TyCtxt] and is defined in the `rustc_middle` crate. +# Checking if a type defines a specific method + +To check if our type defines a method called `some_method`: + +```rust +use crate::utils::{is_type_diagnostic_item, return_ty}; + +impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MyTypeImpl { + fn check_impl_item(&mut self, cx: &LateContext<'a, 'tcx>, impl_item: &'tcx ImplItem<'_>) { + if_chain! { + // Check if item is a method/function + if let ImplItemKind::Fn(ref signature, _) = impl_item.kind; + // Check the method is named `some_method` + if impl_item.ident.name == sym!(some_method); + // We can also check it has a parameter `self` + if signature.decl.implicit_self.has_implicit_self(); + // We can go further and even check if its return type is `String` + if is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id), sym!(string_type)); + then { + // ... + } + } + } +} +``` + # Dealing with macros There are several helpers in Clippy's utils to deal with macros: From a44fa387efff44414c7baac249dcd148b93e2eb1 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Mon, 1 Jun 2020 09:26:40 +0200 Subject: [PATCH 0167/4780] Update documentation on changelog updates --- CHANGELOG.md | 19 ++++++++++--------- doc/changelog_update.md | 9 +++++---- 2 files changed, 15 insertions(+), 13 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index fcc9895dd..dd0905e9f 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -31,17 +31,17 @@ Current beta, release 2020-07-16 * Downgrade [`match_bool`] to pedantic [#5408](https://github.com/rust-lang/rust-clippy/pull/5408) * Downgrade [`match_wild_err_arm`] to pedantic and update help messages. [#5622](https://github.com/rust-lang/rust-clippy/pull/5622) * Downgrade [`useless_let_if_seq`] to nursery. [#5599](https://github.com/rust-lang/rust-clippy/pull/5599) -* Generalize [`option_and_then_some`] and rename to [`bind_instead_of_map`]. [#5529](https://github.com/rust-lang/rust-clippy/pull/5529) -* Rename [`identity_conversion`] to [`useless_conversion`]. [#5568](https://github.com/rust-lang/rust-clippy/pull/5568) -* Merge [`block_in_if_condition_expr`] and [`block_in_if_condition_stmt`] into [`blocks_in_if_conditions`]. +* Generalize `option_and_then_some` and rename to [`bind_instead_of_map`]. [#5529](https://github.com/rust-lang/rust-clippy/pull/5529) +* Rename `identity_conversion` to [`useless_conversion`]. [#5568](https://github.com/rust-lang/rust-clippy/pull/5568) +* Merge `block_in_if_condition_expr` and `block_in_if_condition_stmt` into [`blocks_in_if_conditions`]. [#5563](https://github.com/rust-lang/rust-clippy/pull/5563) -* Merge [`option_map_unwrap_or`], [`option_map_unwrap_or_else`] and [`result_map_unwrap_or_else`] into [`map_unwrap_or`]. +* Merge `option_map_unwrap_or`, `option_map_unwrap_or_else` and `result_map_unwrap_or_else` into [`map_unwrap_or`]. [#5563](https://github.com/rust-lang/rust-clippy/pull/5563) -* Merge [`option_unwrap_used`] and [`result_unwrap_used`] into [`unwrap_used`]. +* Merge `option_unwrap_used` and `result_unwrap_used` into [`unwrap_used`]. [#5563](https://github.com/rust-lang/rust-clippy/pull/5563) -* Merge [`option_expect_used`] and [`result_expect_used`] into [`expect_used`]. +* Merge `option_expect_used` and `result_expect_used` into [`expect_used`]. [#5563](https://github.com/rust-lang/rust-clippy/pull/5563) -* Merge [`for_loop_over_option`] and [`for_loop_over_result`] into [`for_loops_over_fallibles`]. +* Merge `for_loop_over_option` and `for_loop_over_result` into [`for_loops_over_fallibles`]. [#5563](https://github.com/rust-lang/rust-clippy/pull/5563) ### Enhancements @@ -61,10 +61,11 @@ Current beta, release 2020-07-16 * Don't trigger [`borrowed_box`] on mutable references. [#5491](https://github.com/rust-lang/rust-clippy/pull/5491) * Allow `1 << 0` in [`identity_op`]. [#5602](https://github.com/rust-lang/rust-clippy/pull/5602) * Allow `use super::*;` glob imports in [`wildcard_imports`]. [#5564](https://github.com/rust-lang/rust-clippy/pull/5564) -* Add ignores to the list of words of [`clippy::doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611) +* Add ignores to the list of words of [`doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611) * Skip dev and build deps in [`multiple_crate_versions`]. [#5636](https://github.com/rust-lang/rust-clippy/pull/5636) * Honor `allow` attribute on arguments in [`ptr_arg`]. [#5647](https://github.com/rust-lang/rust-clippy/pull/5647) -* Honor lint level attributes for [`redundant_field_names`] and [`non_expressive_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/5651) +* Honor lint level attributes for [`redundant_field_names`], [`just_underscores_and_digits`], [`many_single_char_names`] +and [`similar_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/5651) * Ignore calls to `len` in [`or_fun_call`]. [#4429](https://github.com/rust-lang/rust-clippy/pull/4429) ### Suggestion Improvements diff --git a/doc/changelog_update.md b/doc/changelog_update.md index 0b80cce6d..edba3b474 100644 --- a/doc/changelog_update.md +++ b/doc/changelog_update.md @@ -32,8 +32,9 @@ bullet points might be helpful: need to select the Rust release tag from the dropdown and then check the commit of the Clippy directory: - ![Explanation of how to find the commit hash](https://user-images.githubusercontent.com/2042399/62846160-1f8b0480-bcce-11e9-9da8-7964ca034e7a.png) - +To find the commit hash, click on "History" of the relevant branch in github +and search for the latest "Merge commit '' into " commit. +The part is then the most recent commit in the clippy repo. ### 2. Fetching the PRs between those commits @@ -74,5 +75,5 @@ relevant commit ranges. [changelog]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md [forge]: https://forge.rust-lang.org/ -[rust_master_tools]: https://github.com/rust-lang/rust/tree/master/src/tools -[rust_beta_tools]: https://github.com/rust-lang/rust/tree/beta/src/tools +[rust_master_tools]: https://github.com/rust-lang/rust/tree/master/src/tools/clippy +[rust_beta_tools]: https://github.com/rust-lang/rust/tree/beta/src/tools/clippy From fbf0b84b32aab798258838d5e932dbc56c4a1813 Mon Sep 17 00:00:00 2001 From: Lzu Tao Date: Tue, 2 Jun 2020 21:42:33 +0700 Subject: [PATCH 0168/4780] Make use of slice pattern --- clippy_lints/src/utils/mod.rs | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index 6c1488664..7e07e7751 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -165,8 +165,8 @@ pub fn match_trait_method(cx: &LateContext<'_, '_>, expr: &Expr<'_>, path: &[&st /// Checks if an expression references a variable of the given name. pub fn match_var(expr: &Expr<'_>, var: Name) -> bool { if let ExprKind::Path(QPath::Resolved(None, ref path)) = expr.kind { - if path.segments.len() == 1 && path.segments[0].ident.name == var { - return true; + if let [p] = path.segments { + return p.ident.name == var; } } false @@ -181,8 +181,7 @@ pub fn last_path_segment<'tcx>(path: &QPath<'tcx>) -> &'tcx PathSegment<'tcx> { pub fn single_segment_path<'tcx>(path: &QPath<'tcx>) -> Option<&'tcx PathSegment<'tcx>> { match *path { - QPath::Resolved(_, ref path) if path.segments.len() == 1 => Some(&path.segments[0]), - QPath::Resolved(..) => None, + QPath::Resolved(_, ref path) => path.segments.get(0), QPath::TypeRelative(_, ref seg) => Some(seg), } } @@ -201,9 +200,12 @@ pub fn match_qpath(path: &QPath<'_>, segments: &[&str]) -> bool { QPath::Resolved(_, ref path) => match_path(path, segments), QPath::TypeRelative(ref ty, ref segment) => match ty.kind { TyKind::Path(ref inner_path) => { - !segments.is_empty() - && match_qpath(inner_path, &segments[..(segments.len() - 1)]) - && segment.ident.name.as_str() == segments[segments.len() - 1] + if let [prefix @ .., end] = segments { + if match_qpath(inner_path, prefix) { + return segment.ident.name.as_str() == *end; + } + } + false }, _ => false, }, From dcd480678236d3829f3af3ae9c3339e3e10aebad Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Tue, 2 Jun 2020 20:45:57 +0200 Subject: [PATCH 0169/4780] Apply suggestions from PR review --- CHANGELOG.md | 6 +++--- doc/changelog_update.md | 7 ++++--- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index dd0905e9f..a8ec5fa67 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -46,7 +46,7 @@ Current beta, release 2020-07-16 ### Enhancements -* Avoid running cargo/internal lints when not enabled. [#5505](https://github.com/rust-lang/rust-clippy/pull/5505) +* Avoid running cargo lints when not enabled to improve performance. [#5505](https://github.com/rust-lang/rust-clippy/pull/5505) * Extend [`useless_conversion`] with `TryFrom` and `TryInto`. [#5631](https://github.com/rust-lang/rust-clippy/pull/5631) * Lint also in type parameters and where clauses in [`unused_unit`]. [#5592](https://github.com/rust-lang/rust-clippy/pull/5592) * Do not suggest deriving `Default` in [`new_without_default`]. [#5616](https://github.com/rust-lang/rust-clippy/pull/5616) @@ -61,7 +61,7 @@ Current beta, release 2020-07-16 * Don't trigger [`borrowed_box`] on mutable references. [#5491](https://github.com/rust-lang/rust-clippy/pull/5491) * Allow `1 << 0` in [`identity_op`]. [#5602](https://github.com/rust-lang/rust-clippy/pull/5602) * Allow `use super::*;` glob imports in [`wildcard_imports`]. [#5564](https://github.com/rust-lang/rust-clippy/pull/5564) -* Add ignores to the list of words of [`doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611) +* Whitelist more words in [`doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611) * Skip dev and build deps in [`multiple_crate_versions`]. [#5636](https://github.com/rust-lang/rust-clippy/pull/5636) * Honor `allow` attribute on arguments in [`ptr_arg`]. [#5647](https://github.com/rust-lang/rust-clippy/pull/5647) * Honor lint level attributes for [`redundant_field_names`], [`just_underscores_and_digits`], [`many_single_char_names`] @@ -78,7 +78,7 @@ and [`similar_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/565 ### ICE Fixes * Fix ICE caused in unwrap module. [#5590](https://github.com/rust-lang/rust-clippy/pull/5590) -* Fix crash on rustc test issue-69020-assoc-const-arith-overflow.rs [#5499](https://github.com/rust-lang/rust-clippy/pull/5499) +* Fix ICE on rustc test issue-69020-assoc-const-arith-overflow.rs [#5499](https://github.com/rust-lang/rust-clippy/pull/5499) ### Documentation diff --git a/doc/changelog_update.md b/doc/changelog_update.md index edba3b474..1ec07b9db 100644 --- a/doc/changelog_update.md +++ b/doc/changelog_update.md @@ -32,9 +32,10 @@ bullet points might be helpful: need to select the Rust release tag from the dropdown and then check the commit of the Clippy directory: -To find the commit hash, click on "History" of the relevant branch in github -and search for the latest "Merge commit '' into " commit. -The part is then the most recent commit in the clippy repo. +To find the commit hash, issue the following command when in a `rust-lang/rust` checkout: +``` +git log --oneline -- src/tools/clippy/ | grep -o "Merge commit '[a-f0-9]*' into .*" | head -1 | sed -e "s/Merge commit '\([a-f0-9]*\)' into .*/\1/g" +``` ### 2. Fetching the PRs between those commits From b39fd5f62f80cb9bb47ac44d7100f694e0c7301c Mon Sep 17 00:00:00 2001 From: Lzu Tao Date: Wed, 3 Jun 2020 09:04:24 +0700 Subject: [PATCH 0170/4780] Fix false negative of checked_conversion lint --- clippy_lints/src/checked_conversions.rs | 78 ++++++++--------- tests/ui/checked_conversions.fixed | 106 +++++++++--------------- tests/ui/checked_conversions.rs | 106 +++++++++--------------- tests/ui/checked_conversions.stderr | 98 ++++++++++++++++------ tests/ui/checked_conversions.stdout | 0 5 files changed, 188 insertions(+), 200 deletions(-) delete mode 100644 tests/ui/checked_conversions.stdout diff --git a/clippy_lints/src/checked_conversions.rs b/clippy_lints/src/checked_conversions.rs index d9776dd50..e845ef99c 100644 --- a/clippy_lints/src/checked_conversions.rs +++ b/clippy_lints/src/checked_conversions.rs @@ -58,24 +58,18 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for CheckedConversions { } }; - if_chain! { - if let Some(cv) = result; - if let Some(to_type) = cv.to_type; - - then { + if let Some(cv) = result { + if let Some(to_type) = cv.to_type { let mut applicability = Applicability::MachineApplicable; - let snippet = snippet_with_applicability(cx, cv.expr_to_cast.span, "_", &mut - applicability); + let snippet = snippet_with_applicability(cx, cv.expr_to_cast.span, "_", &mut applicability); span_lint_and_sugg( cx, CHECKED_CONVERSIONS, item.span, "Checked cast can be simplified.", "try", - format!("{}::try_from({}).is_ok()", - to_type, - snippet), - applicability + format!("{}::try_from({}).is_ok()", to_type, snippet), + applicability, ); } } @@ -184,7 +178,7 @@ fn check_upper_bound<'tcx>(expr: &'tcx Expr<'tcx>) -> Option> { if_chain! { if let ExprKind::Binary(ref op, ref left, ref right) = &expr.kind; if let Some((candidate, check)) = normalize_le_ge(op, left, right); - if let Some((from, to)) = get_types_from_cast(check, MAX_VALUE, INTS); + if let Some((from, to)) = get_types_from_cast(check, INTS, "max_value", "MAX"); then { Conversion::try_new(candidate, from, to) @@ -224,7 +218,7 @@ fn check_lower_bound_zero<'a>(candidate: &'a Expr<'_>, check: &'a Expr<'_>) -> O /// Check for `expr >= (to_type::MIN as from_type)` fn check_lower_bound_min<'a>(candidate: &'a Expr<'_>, check: &'a Expr<'_>) -> Option> { - if let Some((from, to)) = get_types_from_cast(check, MIN_VALUE, SINTS) { + if let Some((from, to)) = get_types_from_cast(check, SINTS, "min_value", "MIN") { Conversion::try_new(candidate, from, to) } else { None @@ -232,10 +226,16 @@ fn check_lower_bound_min<'a>(candidate: &'a Expr<'_>, check: &'a Expr<'_>) -> Op } /// Tries to extract the from- and to-type from a cast expression -fn get_types_from_cast<'a>(expr: &'a Expr<'_>, func: &'a str, types: &'a [&str]) -> Option<(&'a str, &'a str)> { - // `to_type::maxmin_value() as from_type` +fn get_types_from_cast<'a>( + expr: &'a Expr<'_>, + types: &'a [&str], + func: &'a str, + assoc_const: &'a str, +) -> Option<(&'a str, &'a str)> { + // `to_type::max_value() as from_type` + // or `to_type::MAX as from_type` let call_from_cast: Option<(&Expr<'_>, &str)> = if_chain! { - // to_type::maxmin_value(), from_type + // to_type::max_value(), from_type if let ExprKind::Cast(ref limit, ref from_type) = &expr.kind; if let TyKind::Path(ref from_type_path) = &from_type.kind; if let Some(from_sym) = int_ty_to_sym(from_type_path); @@ -247,17 +247,17 @@ fn get_types_from_cast<'a>(expr: &'a Expr<'_>, func: &'a str, types: &'a [&str]) } }; - // `from_type::from(to_type::maxmin_value())` + // `from_type::from(to_type::max_value())` let limit_from: Option<(&Expr<'_>, &str)> = call_from_cast.or_else(|| { if_chain! { - // `from_type::from, to_type::maxmin_value()` + // `from_type::from, to_type::max_value()` if let ExprKind::Call(ref from_func, ref args) = &expr.kind; - // `to_type::maxmin_value()` + // `to_type::max_value()` if args.len() == 1; if let limit = &args[0]; // `from_type::from` if let ExprKind::Path(ref path) = &from_func.kind; - if let Some(from_sym) = get_implementing_type(path, INTS, FROM); + if let Some(from_sym) = get_implementing_type(path, INTS, "from"); then { Some((limit, from_sym)) @@ -268,22 +268,26 @@ fn get_types_from_cast<'a>(expr: &'a Expr<'_>, func: &'a str, types: &'a [&str]) }); if let Some((limit, from_type)) = limit_from { - if_chain! { - if let ExprKind::Call(ref fun_name, _) = &limit.kind; - // `to_type, maxmin_value` - if let ExprKind::Path(ref path) = &fun_name.kind; - // `to_type` - if let Some(to_type) = get_implementing_type(path, types, func); - - then { - Some((from_type, to_type)) - } else { - None - } + match limit.kind { + // `from_type::from(_)` + ExprKind::Call(path, _) => { + if let ExprKind::Path(ref path) = path.kind { + // `to_type` + if let Some(to_type) = get_implementing_type(path, types, func) { + return Some((from_type, to_type)); + } + } + }, + // `to_type::MAX` + ExprKind::Path(ref path) => { + if let Some(to_type) = get_implementing_type(path, types, assoc_const) { + return Some((from_type, to_type)); + } + }, + _ => {}, } - } else { - None - } + }; + None } /// Gets the type which implements the called function @@ -336,10 +340,6 @@ fn normalize_le_ge<'a>(op: &BinOp, left: &'a Expr<'a>, right: &'a Expr<'a>) -> O } // Constants -const FROM: &str = "from"; -const MAX_VALUE: &str = "max_value"; -const MIN_VALUE: &str = "min_value"; - const UINTS: &[&str] = &["u8", "u16", "u32", "u64", "usize"]; const SINTS: &[&str] = &["i8", "i16", "i32", "i64", "isize"]; const INTS: &[&str] = &["u8", "u16", "u32", "u64", "usize", "i8", "i16", "i32", "i64", "isize"]; diff --git a/tests/ui/checked_conversions.fixed b/tests/ui/checked_conversions.fixed index 7febd6f37..12290db3d 100644 --- a/tests/ui/checked_conversions.fixed +++ b/tests/ui/checked_conversions.fixed @@ -1,106 +1,76 @@ // run-rustfix +#![allow( + clippy::cast_lossless, + // Int::max_value will be deprecated in the future + deprecated, +)] #![warn(clippy::checked_conversions)] -#![allow(clippy::cast_lossless)] -#![allow(dead_code)] + use std::convert::TryFrom; // Positive tests // Signed to unsigned -fn i64_to_u32(value: i64) -> Option { - if u32::try_from(value).is_ok() { - Some(value as u32) - } else { - None - } +pub fn i64_to_u32(value: i64) { + let _ = u32::try_from(value).is_ok(); + let _ = u32::try_from(value).is_ok(); } -fn i64_to_u16(value: i64) -> Option { - if u16::try_from(value).is_ok() { - Some(value as u16) - } else { - None - } +pub fn i64_to_u16(value: i64) { + let _ = u16::try_from(value).is_ok(); + let _ = u16::try_from(value).is_ok(); } -fn isize_to_u8(value: isize) -> Option { - if u8::try_from(value).is_ok() { - Some(value as u8) - } else { - None - } +pub fn isize_to_u8(value: isize) { + let _ = u8::try_from(value).is_ok(); + let _ = u8::try_from(value).is_ok(); } // Signed to signed -fn i64_to_i32(value: i64) -> Option { - if i32::try_from(value).is_ok() { - Some(value as i32) - } else { - None - } +pub fn i64_to_i32(value: i64) { + let _ = i32::try_from(value).is_ok(); + let _ = i32::try_from(value).is_ok(); } -fn i64_to_i16(value: i64) -> Option { - if i16::try_from(value).is_ok() { - Some(value as i16) - } else { - None - } +pub fn i64_to_i16(value: i64) { + let _ = i16::try_from(value).is_ok(); + let _ = i16::try_from(value).is_ok(); } // Unsigned to X -fn u32_to_i32(value: u32) -> Option { - if i32::try_from(value).is_ok() { - Some(value as i32) - } else { - None - } +pub fn u32_to_i32(value: u32) { + let _ = i32::try_from(value).is_ok(); + let _ = i32::try_from(value).is_ok(); } -fn usize_to_isize(value: usize) -> isize { - if isize::try_from(value).is_ok() && value as i32 == 5 { - 5 - } else { - 1 - } +pub fn usize_to_isize(value: usize) { + let _ = isize::try_from(value).is_ok() && value as i32 == 5; + let _ = isize::try_from(value).is_ok() && value as i32 == 5; } -fn u32_to_u16(value: u32) -> isize { - if u16::try_from(value).is_ok() && value as i32 == 5 { - 5 - } else { - 1 - } +pub fn u32_to_u16(value: u32) { + let _ = u16::try_from(value).is_ok() && value as i32 == 5; + let _ = u16::try_from(value).is_ok() && value as i32 == 5; } // Negative tests -fn no_i64_to_i32(value: i64) -> Option { - if value <= (i32::max_value() as i64) && value >= 0 { - Some(value as i32) - } else { - None - } +pub fn no_i64_to_i32(value: i64) { + let _ = value <= (i32::max_value() as i64) && value >= 0; + let _ = value <= (i32::MAX as i64) && value >= 0; } -fn no_isize_to_u8(value: isize) -> Option { - if value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize) { - Some(value as u8) - } else { - None - } +pub fn no_isize_to_u8(value: isize) { + let _ = value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize); + let _ = value <= (u8::MAX as isize) && value >= (u8::MIN as isize); } -fn i8_to_u8(value: i8) -> Option { - if value >= 0 { - Some(value as u8) - } else { - None - } +pub fn i8_to_u8(value: i8) { + let _ = value >= 0; } fn main() {} diff --git a/tests/ui/checked_conversions.rs b/tests/ui/checked_conversions.rs index a643354e2..895a301e8 100644 --- a/tests/ui/checked_conversions.rs +++ b/tests/ui/checked_conversions.rs @@ -1,106 +1,76 @@ // run-rustfix +#![allow( + clippy::cast_lossless, + // Int::max_value will be deprecated in the future + deprecated, +)] #![warn(clippy::checked_conversions)] -#![allow(clippy::cast_lossless)] -#![allow(dead_code)] + use std::convert::TryFrom; // Positive tests // Signed to unsigned -fn i64_to_u32(value: i64) -> Option { - if value <= (u32::max_value() as i64) && value >= 0 { - Some(value as u32) - } else { - None - } +pub fn i64_to_u32(value: i64) { + let _ = value <= (u32::max_value() as i64) && value >= 0; + let _ = value <= (u32::MAX as i64) && value >= 0; } -fn i64_to_u16(value: i64) -> Option { - if value <= i64::from(u16::max_value()) && value >= 0 { - Some(value as u16) - } else { - None - } +pub fn i64_to_u16(value: i64) { + let _ = value <= i64::from(u16::max_value()) && value >= 0; + let _ = value <= i64::from(u16::MAX) && value >= 0; } -fn isize_to_u8(value: isize) -> Option { - if value <= (u8::max_value() as isize) && value >= 0 { - Some(value as u8) - } else { - None - } +pub fn isize_to_u8(value: isize) { + let _ = value <= (u8::max_value() as isize) && value >= 0; + let _ = value <= (u8::MAX as isize) && value >= 0; } // Signed to signed -fn i64_to_i32(value: i64) -> Option { - if value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64) { - Some(value as i32) - } else { - None - } +pub fn i64_to_i32(value: i64) { + let _ = value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64); + let _ = value <= (i32::MAX as i64) && value >= (i32::MIN as i64); } -fn i64_to_i16(value: i64) -> Option { - if value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value()) { - Some(value as i16) - } else { - None - } +pub fn i64_to_i16(value: i64) { + let _ = value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value()); + let _ = value <= i64::from(i16::MAX) && value >= i64::from(i16::MIN); } // Unsigned to X -fn u32_to_i32(value: u32) -> Option { - if value <= i32::max_value() as u32 { - Some(value as i32) - } else { - None - } +pub fn u32_to_i32(value: u32) { + let _ = value <= i32::max_value() as u32; + let _ = value <= i32::MAX as u32; } -fn usize_to_isize(value: usize) -> isize { - if value <= isize::max_value() as usize && value as i32 == 5 { - 5 - } else { - 1 - } +pub fn usize_to_isize(value: usize) { + let _ = value <= isize::max_value() as usize && value as i32 == 5; + let _ = value <= isize::MAX as usize && value as i32 == 5; } -fn u32_to_u16(value: u32) -> isize { - if value <= u16::max_value() as u32 && value as i32 == 5 { - 5 - } else { - 1 - } +pub fn u32_to_u16(value: u32) { + let _ = value <= u16::max_value() as u32 && value as i32 == 5; + let _ = value <= u16::MAX as u32 && value as i32 == 5; } // Negative tests -fn no_i64_to_i32(value: i64) -> Option { - if value <= (i32::max_value() as i64) && value >= 0 { - Some(value as i32) - } else { - None - } +pub fn no_i64_to_i32(value: i64) { + let _ = value <= (i32::max_value() as i64) && value >= 0; + let _ = value <= (i32::MAX as i64) && value >= 0; } -fn no_isize_to_u8(value: isize) -> Option { - if value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize) { - Some(value as u8) - } else { - None - } +pub fn no_isize_to_u8(value: isize) { + let _ = value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize); + let _ = value <= (u8::MAX as isize) && value >= (u8::MIN as isize); } -fn i8_to_u8(value: i8) -> Option { - if value >= 0 { - Some(value as u8) - } else { - None - } +pub fn i8_to_u8(value: i8) { + let _ = value >= 0; } fn main() {} diff --git a/tests/ui/checked_conversions.stderr b/tests/ui/checked_conversions.stderr index f678f0096..648ba3ccd 100644 --- a/tests/ui/checked_conversions.stderr +++ b/tests/ui/checked_conversions.stderr @@ -1,52 +1,100 @@ error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:13:8 + --> $DIR/checked_conversions.rs:17:13 | -LL | if value <= (u32::max_value() as i64) && value >= 0 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()` +LL | let _ = value <= (u32::max_value() as i64) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()` | = note: `-D clippy::checked-conversions` implied by `-D warnings` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:21:8 + --> $DIR/checked_conversions.rs:18:13 | -LL | if value <= i64::from(u16::max_value()) && value >= 0 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` +LL | let _ = value <= (u32::MAX as i64) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:29:8 + --> $DIR/checked_conversions.rs:22:13 | -LL | if value <= (u8::max_value() as isize) && value >= 0 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()` +LL | let _ = value <= i64::from(u16::max_value()) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:39:8 + --> $DIR/checked_conversions.rs:23:13 | -LL | if value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64) { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` +LL | let _ = value <= i64::from(u16::MAX) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:47:8 + --> $DIR/checked_conversions.rs:27:13 | -LL | if value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value()) { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()` +LL | let _ = value <= (u8::max_value() as isize) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:57:8 + --> $DIR/checked_conversions.rs:28:13 | -LL | if value <= i32::max_value() as u32 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` +LL | let _ = value <= (u8::MAX as isize) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:65:8 + --> $DIR/checked_conversions.rs:34:13 | -LL | if value <= isize::max_value() as usize && value as i32 == 5 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()` +LL | let _ = value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:73:8 + --> $DIR/checked_conversions.rs:35:13 | -LL | if value <= u16::max_value() as u32 && value as i32 == 5 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` +LL | let _ = value <= (i32::MAX as i64) && value >= (i32::MIN as i64); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` -error: aborting due to 8 previous errors +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:39:13 + | +LL | let _ = value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value()); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:40:13 + | +LL | let _ = value <= i64::from(i16::MAX) && value >= i64::from(i16::MIN); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:46:13 + | +LL | let _ = value <= i32::max_value() as u32; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:47:13 + | +LL | let _ = value <= i32::MAX as u32; + | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:51:13 + | +LL | let _ = value <= isize::max_value() as usize && value as i32 == 5; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:52:13 + | +LL | let _ = value <= isize::MAX as usize && value as i32 == 5; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:56:13 + | +LL | let _ = value <= u16::max_value() as u32 && value as i32 == 5; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:57:13 + | +LL | let _ = value <= u16::MAX as u32 && value as i32 == 5; + | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` + +error: aborting due to 16 previous errors diff --git a/tests/ui/checked_conversions.stdout b/tests/ui/checked_conversions.stdout deleted file mode 100644 index e69de29bb..000000000 From 7654125d27d95d5c329e554115b510efc1ab1e60 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= Date: Thu, 4 Jun 2020 03:34:22 +0200 Subject: [PATCH 0171/4780] match_wildcard_for_single_variants: remove empty line at start of lint example. See https://rust-lang.github.io/rust-clippy/master/index.html#match_wildcard_for_single_variants changelog: none --- clippy_lints/src/matches.rs | 1 - 1 file changed, 1 deletion(-) diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs index 146212cb2..6d7af45a4 100644 --- a/clippy_lints/src/matches.rs +++ b/clippy_lints/src/matches.rs @@ -270,7 +270,6 @@ declare_clippy_lint! { /// ```rust /// # enum Foo { A, B, C } /// # let x = Foo::B; - /// /// // Bad /// match x { /// Foo::A => {}, From 9ef15ae7c86a08c96a368f6728b25e1c55f6e10b Mon Sep 17 00:00:00 2001 From: flip1995 Date: Fri, 5 Jun 2020 13:56:07 +0200 Subject: [PATCH 0172/4780] Reorder sections of release documentation Before tagging a commit the beta branch has to be remerged --- doc/release.md | 120 ++++++++++++++++++++++++------------------------- 1 file changed, 60 insertions(+), 60 deletions(-) diff --git a/doc/release.md b/doc/release.md index 9d69fa8a7..f0a7fe521 100644 --- a/doc/release.md +++ b/doc/release.md @@ -7,11 +7,11 @@ Clippy is released together with stable Rust releases. The dates for these releases can be found at the [Rust Forge]. This document explains the necessary steps to create a Clippy release. -1. [Find the Clippy commit](#find-the-clippy-commit) -2. [Tag the stable commit](#tag-the-stable-commit) -3. [Update `CHANGELOG.md`](#update-changelogmd) -4. [Remerge the `beta` branch](#remerge-the-beta-branch) -5. [Update the `beta` branch](#update-the-beta-branch) +1. [Remerge the `beta` branch](#remerge-the-beta-branch) +2. [Update the `beta` branch](#update-the-beta-branch) +3. [Find the Clippy commit](#find-the-clippy-commit) +4. [Tag the stable commit](#tag-the-stable-commit) +5. [Update `CHANGELOG.md`](#update-changelogmd) _NOTE: This document is for stable Rust releases, not for point releases. For point releases, step 1. and 2. should be enough._ @@ -19,6 +19,61 @@ point releases, step 1. and 2. should be enough._ [Rust Forge]: https://forge.rust-lang.org/ +## Remerge the `beta` branch + +This step is only necessary, if since the last release something was backported +to the beta Rust release. The remerge is then necessary, to make sure that the +Clippy commit, that was used by the now stable Rust release, persists in the +tree of the Clippy repository. + +To find out if this step is necessary run + +```bash +# Assumes that the local master branch is up-to-date +$ git fetch upstream +$ git branch master --contains upstream/beta +``` + +If this command outputs `master`, this step is **not** necessary. + +```bash +# Assuming `HEAD` is the current `master` branch of rust-lang/rust-clippy +$ git checkout -b backport_remerge +$ git merge upstream/beta +$ git diff # This diff has to be empty, otherwise something with the remerge failed +$ git push origin backport_remerge # This can be pushed to your fork +``` + +After this, open a PR to the master branch. In this PR, the commit hash of the +`HEAD` of the `beta` branch must exists. In addition to that, no files should +be changed by this PR. + + +## Update the `beta` branch + +This step must be done **after** the PR of the previous step was merged. + +First, the Clippy commit of the `beta` branch of the Rust repository has to be +determined. + +```bash +# Assuming the current directory corresponds to the Rust repository +$ git checkout beta +$ git submodule update +$ BETA_SHA=$(git submodule status src/tools/clippy | awk '{print $1}') +``` + +After finding the Clippy commit, the `beta` branch in the Clippy repository can +be updated. + +```bash +# Assuming the current directory corresponds to the Clippy repository +$ git checkout beta +$ git rebase $BETA_SHA +$ git push upstream beta +``` + + ## Find the Clippy commit The first step is to tag the Clippy commit, that is included in the stable Rust @@ -54,58 +109,3 @@ After this, the release should be available on the Clippy [release page]. For this see the document on [how to update the changelog]. [how to update the changelog]: https://github.com/rust-lang/rust-clippy/blob/master/doc/changelog_update.md - - -## Remerge the `beta` branch - -This step is only necessary, if since the last release something was backported -to the beta Rust release. The remerge is then necessary, to make sure that the -Clippy commit, that was used by the now stable Rust release, persists in the -tree of the Clippy repository. - -To find out if this step is necessary run - -```bash -# Assumes that the local master branch is up-to-date -$ git fetch upstream -$ git branch master --contains upstream/beta -``` - -If this command outputs `master`, this step is **not** necessary. - -```bash -# Assuming `HEAD` is the current `master` branch of rust-lang/rust-clippy -$ git checkout -b backport_remerge -$ git merge beta -$ git diff # This diff has to be empty, otherwise something with the remerge failed -$ git push origin backport_remerge # This can be pushed to your fork -``` - -After this, open a PR to the master branch. In this PR, the commit hash of the -`HEAD` of the `beta` branch must exists. In addition to that, no files should -be changed by this PR. - - -## Update the `beta` branch - -This step must be done **after** the PR of the previous step was merged. - -First, the Clippy commit of the `beta` branch of the Rust repository has to be -determined. - -```bash -# Assuming the current directory corresponds to the Rust repository -$ git checkout beta -$ git submodule update -$ BETA_SHA=$(git submodule status src/tools/clippy | awk '{print $1}') -``` - -After finding the Clippy commit, the `beta` branch in the Clippy repository can -be updated. - -```bash -# Assuming the current directory corresponds to the Clippy repository -$ git checkout beta -$ git rebase $BETA_SHA -$ git push upstream beta -``` From 6b9e2e90bf7688bfbcf357fda6e0ef74e11ba1ff Mon Sep 17 00:00:00 2001 From: flip1995 Date: Fri, 5 Jun 2020 14:47:12 +0200 Subject: [PATCH 0173/4780] Replace all remaining occurrences of submodule with subtree --- doc/changelog_update.md | 2 +- doc/release.md | 6 ++---- 2 files changed, 3 insertions(+), 5 deletions(-) diff --git a/doc/changelog_update.md b/doc/changelog_update.md index 0b80cce6d..6657ab418 100644 --- a/doc/changelog_update.md +++ b/doc/changelog_update.md @@ -18,7 +18,7 @@ been very rare that Clippy changes were included in a patch release. ### 1. Finding the relevant Clippy commits -Each Rust release ships with its own version of Clippy. The Clippy submodule can +Each Rust release ships with its own version of Clippy. The Clippy subtree can be found in the `tools` directory of the Rust repository. Depending on the current time and what exactly you want to update, the following diff --git a/doc/release.md b/doc/release.md index f0a7fe521..391952ea6 100644 --- a/doc/release.md +++ b/doc/release.md @@ -59,8 +59,7 @@ determined. ```bash # Assuming the current directory corresponds to the Rust repository $ git checkout beta -$ git submodule update -$ BETA_SHA=$(git submodule status src/tools/clippy | awk '{print $1}') +$ BETA_SHA=$(git log --oneline -- src/tools/clippy/ | grep -o "Merge commit '[a-f0-9]*' into .*" | head -1 | sed -e "s/Merge commit '\([a-f0-9]*\)' into .*/\1/g") ``` After finding the Clippy commit, the `beta` branch in the Clippy repository can @@ -83,8 +82,7 @@ release. This commit can be found in the Rust repository. # Assuming the current directory corresponds to the Rust repository $ git fetch upstream # `upstream` is the `rust-lang/rust` remote $ git checkout 1.XX.0 # XX should be exchanged with the corresponding version -$ git submodule update -$ SHA=$(git submodule status src/tools/clippy | awk '{print $1}') +$ SHA=$(git log --oneline -- src/tools/clippy/ | grep -o "Merge commit '[a-f0-9]*' into .*" | head -1 | sed -e "s/Merge commit '\([a-f0-9]*\)' into .*/\1/g") ``` From 413713c8848ec94d5f1709a41537c300da398806 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Fri, 5 Jun 2020 22:28:58 +0200 Subject: [PATCH 0174/4780] Add error info when cargo metadata fails to run --- clippy_lints/src/cargo_common_metadata.rs | 13 ++----------- clippy_lints/src/multiple_crate_versions.rs | 10 ++-------- clippy_lints/src/utils/mod.rs | 18 ++++++++++++++++++ clippy_lints/src/wildcard_dependencies.rs | 7 +------ 4 files changed, 23 insertions(+), 25 deletions(-) diff --git a/clippy_lints/src/cargo_common_metadata.rs b/clippy_lints/src/cargo_common_metadata.rs index 16b46423c..c40a387d2 100644 --- a/clippy_lints/src/cargo_common_metadata.rs +++ b/clippy_lints/src/cargo_common_metadata.rs @@ -36,13 +36,9 @@ declare_clippy_lint! { "common metadata is defined in `Cargo.toml`" } -fn warning(cx: &LateContext<'_, '_>, message: &str) { - span_lint(cx, CARGO_COMMON_METADATA, DUMMY_SP, message); -} - fn missing_warning(cx: &LateContext<'_, '_>, package: &cargo_metadata::Package, field: &str) { let message = format!("package `{}` is missing `{}` metadata", package.name, field); - warning(cx, &message); + span_lint(cx, CARGO_COMMON_METADATA, DUMMY_SP, &message); } fn is_empty_str(value: &Option) -> bool { @@ -66,12 +62,7 @@ impl LateLintPass<'_, '_> for CargoCommonMetadata { return; } - let metadata = if let Ok(metadata) = cargo_metadata::MetadataCommand::new().no_deps().exec() { - metadata - } else { - warning(cx, "could not read cargo metadata"); - return; - }; + let metadata = unwrap_cargo_metadata!(cx, CARGO_COMMON_METADATA, false); for package in metadata.packages { if is_empty_vec(&package.authors) { diff --git a/clippy_lints/src/multiple_crate_versions.rs b/clippy_lints/src/multiple_crate_versions.rs index b6770804e..6c42014b4 100644 --- a/clippy_lints/src/multiple_crate_versions.rs +++ b/clippy_lints/src/multiple_crate_versions.rs @@ -7,7 +7,7 @@ use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::DUMMY_SP; -use cargo_metadata::{DependencyKind, MetadataCommand, Node, Package, PackageId}; +use cargo_metadata::{DependencyKind, Node, Package, PackageId}; use if_chain::if_chain; use itertools::Itertools; @@ -42,13 +42,7 @@ impl LateLintPass<'_, '_> for MultipleCrateVersions { return; } - let metadata = if let Ok(metadata) = MetadataCommand::new().exec() { - metadata - } else { - span_lint(cx, MULTIPLE_CRATE_VERSIONS, DUMMY_SP, "could not read cargo metadata"); - return; - }; - + let metadata = unwrap_cargo_metadata!(cx, MULTIPLE_CRATE_VERSIONS, true); let local_name = cx.tcx.crate_name(LOCAL_CRATE).as_str(); let mut packages = metadata.packages; packages.sort_by(|a, b| a.name.cmp(&b.name)); diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index 7e07e7751..2cdb6486f 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -1405,6 +1405,24 @@ pub fn run_lints(cx: &LateContext<'_, '_>, lints: &[&'static Lint], id: HirId) - }) } +#[macro_export] +macro_rules! unwrap_cargo_metadata { + ($cx: ident, $lint: ident, $deps: expr) => {{ + let mut command = cargo_metadata::MetadataCommand::new(); + if !$deps { + command.no_deps(); + } + + match command.exec() { + Ok(metadata) => metadata, + Err(err) => { + span_lint($cx, $lint, DUMMY_SP, &format!("could not read cargo metadata: {}", err)); + return; + }, + } + }}; +} + #[cfg(test)] mod test { use super::{trim_multiline, without_block_comments}; diff --git a/clippy_lints/src/wildcard_dependencies.rs b/clippy_lints/src/wildcard_dependencies.rs index d8d48eb15..511518082 100644 --- a/clippy_lints/src/wildcard_dependencies.rs +++ b/clippy_lints/src/wildcard_dependencies.rs @@ -34,12 +34,7 @@ impl LateLintPass<'_, '_> for WildcardDependencies { return; } - let metadata = if let Ok(metadata) = cargo_metadata::MetadataCommand::new().no_deps().exec() { - metadata - } else { - span_lint(cx, WILDCARD_DEPENDENCIES, DUMMY_SP, "could not read cargo metadata"); - return; - }; + let metadata = unwrap_cargo_metadata!(cx, WILDCARD_DEPENDENCIES, false); for dep in &metadata.packages[0].dependencies { // VersionReq::any() does not work From c325c120c21657acb1b131ded41261889e51a62b Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Fri, 5 Jun 2020 22:30:14 +0200 Subject: [PATCH 0175/4780] Fix cargo ui tests when running inside rust repo --- clippy_dev/src/new_lint.rs | 2 ++ tests/compile-test.rs | 4 ---- tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml | 2 ++ tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml | 2 ++ .../multiple_crate_versions/5041_allow_dev_build/Cargo.toml | 2 ++ tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml | 2 ++ tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml | 2 ++ tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml | 2 ++ tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml | 2 ++ 9 files changed, 16 insertions(+), 4 deletions(-) diff --git a/clippy_dev/src/new_lint.rs b/clippy_dev/src/new_lint.rs index c0b2dac2f..1e032a7bc 100644 --- a/clippy_dev/src/new_lint.rs +++ b/clippy_dev/src/new_lint.rs @@ -147,6 +147,8 @@ fn get_manifest_contents(lint_name: &str, hint: &str) -> String { name = "{}" version = "0.1.0" publish = false + +[workspace] "#, hint, lint_name ) diff --git a/tests/compile-test.rs b/tests/compile-test.rs index 194354b29..11b3f69a8 100644 --- a/tests/compile-test.rs +++ b/tests/compile-test.rs @@ -220,10 +220,6 @@ fn run_ui_cargo(config: &mut compiletest::Config) { Ok(result) } - if cargo::is_rustc_test_suite() { - return; - } - config.mode = TestMode::Ui; config.src_base = Path::new("tests").join("ui-cargo").canonicalize().unwrap(); diff --git a/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml b/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml index c64adcf7c..ae0a60329 100644 --- a/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml +++ b/tests/ui-cargo/cargo_common_metadata/fail/Cargo.toml @@ -2,3 +2,5 @@ name = "cargo_common_metadata" version = "0.1.0" publish = false + +[workspace] diff --git a/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml b/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml index c8233f328..737e84e96 100644 --- a/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml +++ b/tests/ui-cargo/cargo_common_metadata/pass/Cargo.toml @@ -9,3 +9,5 @@ readme = "README.md" license = "MIT OR Apache-2.0" keywords = ["metadata", "lint", "clippy"] categories = ["development-tools::testing"] + +[workspace] diff --git a/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/Cargo.toml b/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/Cargo.toml index 72731fbc7..278bebbbd 100644 --- a/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/Cargo.toml +++ b/tests/ui-cargo/multiple_crate_versions/5041_allow_dev_build/Cargo.toml @@ -5,6 +5,8 @@ name = "multiple_crate_versions" version = "0.1.0" publish = false +[workspace] + # One of the versions of winapi is only a dev dependency: allowed [dependencies] ctrlc = "=3.1.0" diff --git a/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml b/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml index 3a94b723f..4f97b0113 100644 --- a/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml +++ b/tests/ui-cargo/multiple_crate_versions/fail/Cargo.toml @@ -3,6 +3,8 @@ name = "multiple_crate_versions" version = "0.1.0" publish = false +[workspace] + [dependencies] ctrlc = "=3.1.0" ansi_term = "=0.11.0" diff --git a/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml b/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml index a9b06420b..b4b49bb36 100644 --- a/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml +++ b/tests/ui-cargo/multiple_crate_versions/pass/Cargo.toml @@ -3,6 +3,8 @@ name = "cargo_common_metadata" version = "0.1.0" publish = false +[workspace] + [dependencies] regex = "1.3.7" serde = "1.0.110" diff --git a/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml b/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml index fd2a34148..3e1a02cbb 100644 --- a/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml +++ b/tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml @@ -3,5 +3,7 @@ name = "wildcard_dependencies" version = "0.1.0" publish = false +[workspace] + [dependencies] regex = "*" diff --git a/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml b/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml index 38cb13914..f844cab09 100644 --- a/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml +++ b/tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml @@ -3,5 +3,7 @@ name = "wildcard_dependencies" version = "0.1.0" publish = false +[workspace] + [dependencies] regex = "1" From 623faac84ec56fa545163ab81d7e3b759a392353 Mon Sep 17 00:00:00 2001 From: Philipp Hansch Date: Sat, 6 Jun 2020 11:50:59 +0200 Subject: [PATCH 0176/4780] Cleanup: Use rustc's `same_types` instead of our `same_tys` --- clippy_lints/src/copies.rs | 14 +++++--------- clippy_lints/src/loops.rs | 8 ++++---- clippy_lints/src/methods/mod.rs | 12 ++++++------ clippy_lints/src/new_without_default.rs | 6 +++--- clippy_lints/src/types.rs | 6 +++--- clippy_lints/src/useless_conversion.rs | 14 +++++++------- clippy_lints/src/utils/mod.rs | 16 +--------------- 7 files changed, 29 insertions(+), 47 deletions(-) diff --git a/clippy_lints/src/copies.rs b/clippy_lints/src/copies.rs index 66722786e..b6d50bdfa 100644 --- a/clippy_lints/src/copies.rs +++ b/clippy_lints/src/copies.rs @@ -1,9 +1,9 @@ -use crate::utils::{get_parent_expr, higher, if_sequence, same_tys, snippet, span_lint_and_note, span_lint_and_then}; +use crate::utils::{get_parent_expr, higher, if_sequence, snippet, span_lint_and_note, span_lint_and_then}; use crate::utils::{SpanlessEq, SpanlessHash}; use rustc_data_structures::fx::FxHashMap; use rustc_hir::{Arm, Block, Expr, ExprKind, MatchSource, Pat, PatKind}; use rustc_lint::{LateContext, LateLintPass}; -use rustc_middle::ty::Ty; +use rustc_middle::ty::{Ty, TyS}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::symbol::Symbol; use std::collections::hash_map::Entry; @@ -242,15 +242,11 @@ fn lint_same_fns_in_if_cond(cx: &LateContext<'_, '_>, conds: &[&Expr<'_>]) { /// Implementation of `MATCH_SAME_ARMS`. fn lint_match_arms<'tcx>(cx: &LateContext<'_, 'tcx>, expr: &Expr<'_>) { - fn same_bindings<'tcx>( - cx: &LateContext<'_, 'tcx>, - lhs: &FxHashMap>, - rhs: &FxHashMap>, - ) -> bool { + fn same_bindings<'tcx>(lhs: &FxHashMap>, rhs: &FxHashMap>) -> bool { lhs.len() == rhs.len() && lhs .iter() - .all(|(name, l_ty)| rhs.get(name).map_or(false, |r_ty| same_tys(cx, l_ty, r_ty))) + .all(|(name, l_ty)| rhs.get(name).map_or(false, |r_ty| TyS::same_type(l_ty, r_ty))) } if let ExprKind::Match(_, ref arms, MatchSource::Normal) = expr.kind { @@ -269,7 +265,7 @@ fn lint_match_arms<'tcx>(cx: &LateContext<'_, 'tcx>, expr: &Expr<'_>) { (min_index..=max_index).all(|index| arms[index].guard.is_none()) && SpanlessEq::new(cx).eq_expr(&lhs.body, &rhs.body) && // all patterns should have the same bindings - same_bindings(cx, &bindings(cx, &lhs.pat), &bindings(cx, &rhs.pat)) + same_bindings(&bindings(cx, &lhs.pat), &bindings(cx, &rhs.pat)) }; let indexed_arms: Vec<(usize, &Arm<'_>)> = arms.iter().enumerate().collect(); diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index dbe41823a..57c62d739 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -8,7 +8,7 @@ use crate::utils::{ multispan_sugg, snippet, snippet_opt, snippet_with_applicability, span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, SpanlessEq, }; -use crate::utils::{is_type_diagnostic_item, qpath_res, same_tys, sugg}; +use crate::utils::{is_type_diagnostic_item, qpath_res, sugg}; use if_chain::if_chain; use rustc_ast::ast; use rustc_data_structures::fx::{FxHashMap, FxHashSet}; @@ -24,7 +24,7 @@ use rustc_lint::{LateContext, LateLintPass, LintContext}; use rustc_middle::hir::map::Map; use rustc_middle::lint::in_external_macro; use rustc_middle::middle::region; -use rustc_middle::ty::{self, Ty}; +use rustc_middle::ty::{self, Ty, TyS}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; use rustc_span::symbol::Symbol; @@ -1256,7 +1256,7 @@ fn check_for_loop_arg(cx: &LateContext<'_, '_>, pat: &Pat<'_>, arg: &Expr<'_>, e } else if method_name == "into_iter" && match_trait_method(cx, arg, &paths::INTO_ITERATOR) { let receiver_ty = cx.tables.expr_ty(&args[0]); let receiver_ty_adjusted = cx.tables.expr_ty_adjusted(&args[0]); - if same_tys(cx, receiver_ty, receiver_ty_adjusted) { + if TyS::same_type(receiver_ty, receiver_ty_adjusted) { let mut applicability = Applicability::MachineApplicable; let object = snippet_with_applicability(cx, args[0].span, "_", &mut applicability); span_lint_and_sugg( @@ -1277,7 +1277,7 @@ fn check_for_loop_arg(cx: &LateContext<'_, '_>, pat: &Pat<'_>, arg: &Expr<'_>, e mutbl: Mutability::Not, }, ); - if same_tys(cx, receiver_ty_adjusted, ref_receiver_ty) { + if TyS::same_type(receiver_ty_adjusted, ref_receiver_ty) { lint_iter_method(cx, args, arg, method_name) } } diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs index a9c0ff24f..78d69690c 100644 --- a/clippy_lints/src/methods/mod.rs +++ b/clippy_lints/src/methods/mod.rs @@ -18,7 +18,7 @@ use rustc_lint::{LateContext, LateLintPass, Lint, LintContext}; use rustc_middle::hir::map::Map; use rustc_middle::lint::in_external_macro; use rustc_middle::ty::subst::GenericArgKind; -use rustc_middle::ty::{self, Ty}; +use rustc_middle::ty::{self, Ty, TyS}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; use rustc_span::symbol::{sym, SymbolStr}; @@ -29,9 +29,9 @@ use crate::utils::{ get_arg_name, get_parent_expr, get_trait_def_id, has_iter_method, higher, implements_trait, in_macro, is_copy, is_ctor_or_promotable_const_function, is_expn_of, is_type_diagnostic_item, iter_input_pats, last_path_segment, match_def_path, match_qpath, match_trait_method, match_type, match_var, method_calls, method_chain_args, paths, - remove_blocks, return_ty, same_tys, single_segment_path, snippet, snippet_with_applicability, - snippet_with_macro_callsite, span_lint, span_lint_and_help, span_lint_and_note, span_lint_and_sugg, - span_lint_and_then, sugg, walk_ptrs_ty, walk_ptrs_ty_depth, SpanlessEq, + remove_blocks, return_ty, single_segment_path, snippet, snippet_with_applicability, snippet_with_macro_callsite, + span_lint, span_lint_and_help, span_lint_and_note, span_lint_and_sugg, span_lint_and_then, sugg, walk_ptrs_ty, + walk_ptrs_ty_depth, SpanlessEq, }; declare_clippy_lint! { @@ -1548,7 +1548,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Methods { let contains_self_ty = |ty: Ty<'tcx>| { ty.walk().any(|inner| match inner.unpack() { - GenericArgKind::Type(inner_ty) => same_tys(cx, self_ty, inner_ty), + GenericArgKind::Type(inner_ty) => TyS::same_type(self_ty, inner_ty), GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false, }) @@ -1575,7 +1575,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Methods { } } - if name == "new" && !same_tys(cx, ret_ty, self_ty) { + if name == "new" && !TyS::same_type(ret_ty, self_ty) { span_lint( cx, NEW_RET_NO_SELF, diff --git a/clippy_lints/src/new_without_default.rs b/clippy_lints/src/new_without_default.rs index e556e5d59..dd236535c 100644 --- a/clippy_lints/src/new_without_default.rs +++ b/clippy_lints/src/new_without_default.rs @@ -1,13 +1,13 @@ use crate::utils::paths; use crate::utils::sugg::DiagnosticBuilderExt; -use crate::utils::{get_trait_def_id, return_ty, same_tys, span_lint_hir_and_then}; +use crate::utils::{get_trait_def_id, return_ty, span_lint_hir_and_then}; use if_chain::if_chain; use rustc_errors::Applicability; use rustc_hir as hir; use rustc_hir::HirIdSet; use rustc_lint::{LateContext, LateLintPass, LintContext}; use rustc_middle::lint::in_external_macro; -use rustc_middle::ty::Ty; +use rustc_middle::ty::{Ty, TyS}; use rustc_session::{declare_tool_lint, impl_lint_pass}; declare_clippy_lint! { @@ -93,7 +93,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NewWithoutDefault { let self_def_id = cx.tcx.hir().local_def_id(cx.tcx.hir().get_parent_item(id)); let self_ty = cx.tcx.type_of(self_def_id); if_chain! { - if same_tys(cx, self_ty, return_ty(cx, id)); + if TyS::same_type(self_ty, return_ty(cx, id)); if let Some(default_trait_id) = get_trait_def_id(cx, &paths::DEFAULT_TRAIT); then { if self.impling_types.is_none() { diff --git a/clippy_lints/src/types.rs b/clippy_lints/src/types.rs index 5ca30d598..bc5fe44b3 100644 --- a/clippy_lints/src/types.rs +++ b/clippy_lints/src/types.rs @@ -17,7 +17,7 @@ use rustc_hir::{ use rustc_lint::{LateContext, LateLintPass, LintContext}; use rustc_middle::hir::map::Map; use rustc_middle::lint::in_external_macro; -use rustc_middle::ty::{self, InferTy, Ty, TyCtxt, TypeckTables}; +use rustc_middle::ty::{self, InferTy, Ty, TyCtxt, TyS, TypeckTables}; use rustc_session::{declare_lint_pass, declare_tool_lint, impl_lint_pass}; use rustc_span::hygiene::{ExpnKind, MacroKind}; use rustc_span::source_map::Span; @@ -31,7 +31,7 @@ use crate::utils::paths; use crate::utils::{ clip, comparisons, differing_macro_contexts, higher, in_constant, indent_of, int_bits, is_type_diagnostic_item, last_path_segment, match_def_path, match_path, method_chain_args, multispan_sugg, numeric_literal::NumericLiteral, - qpath_res, same_tys, sext, snippet, snippet_block_with_applicability, snippet_opt, snippet_with_applicability, + qpath_res, sext, snippet, snippet_block_with_applicability, snippet_opt, snippet_with_applicability, snippet_with_macro_callsite, span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, unsext, }; @@ -2556,7 +2556,7 @@ impl<'a, 'b, 'tcx> Visitor<'tcx> for ImplicitHasherConstructorVisitor<'a, 'b, 't if let ExprKind::Path(QPath::TypeRelative(ref ty, ref method)) = fun.kind; if let TyKind::Path(QPath::Resolved(None, ty_path)) = ty.kind; then { - if !same_tys(self.cx, self.target.ty(), self.body.expr_ty(e)) { + if !TyS::same_type(self.target.ty(), self.body.expr_ty(e)) { return; } diff --git a/clippy_lints/src/useless_conversion.rs b/clippy_lints/src/useless_conversion.rs index 7fa97b246..141035a98 100644 --- a/clippy_lints/src/useless_conversion.rs +++ b/clippy_lints/src/useless_conversion.rs @@ -1,12 +1,12 @@ use crate::utils::{ - is_type_diagnostic_item, match_def_path, match_trait_method, paths, same_tys, snippet, snippet_with_macro_callsite, + is_type_diagnostic_item, match_def_path, match_trait_method, paths, snippet, snippet_with_macro_callsite, span_lint_and_help, span_lint_and_sugg, }; use if_chain::if_chain; use rustc_errors::Applicability; use rustc_hir::{Expr, ExprKind, HirId, MatchSource}; use rustc_lint::{LateContext, LateLintPass}; -use rustc_middle::ty; +use rustc_middle::ty::{self, TyS}; use rustc_session::{declare_tool_lint, impl_lint_pass}; declare_clippy_lint! { @@ -65,7 +65,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { if match_trait_method(cx, e, &paths::INTO) && &*name.ident.as_str() == "into" { let a = cx.tables.expr_ty(e); let b = cx.tables.expr_ty(&args[0]); - if same_tys(cx, a, b) { + if TyS::same_type(a, b) { let sugg = snippet_with_macro_callsite(cx, args[0].span, "").to_string(); span_lint_and_sugg( cx, @@ -81,7 +81,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { if match_trait_method(cx, e, &paths::INTO_ITERATOR) && &*name.ident.as_str() == "into_iter" { let a = cx.tables.expr_ty(e); let b = cx.tables.expr_ty(&args[0]); - if same_tys(cx, a, b) { + if TyS::same_type(a, b) { let sugg = snippet(cx, args[0].span, "").into_owned(); span_lint_and_sugg( cx, @@ -101,7 +101,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { if is_type_diagnostic_item(cx, a, sym!(result_type)); if let ty::Adt(_, substs) = a.kind; if let Some(a_type) = substs.types().next(); - if same_tys(cx, a_type, b); + if TyS::same_type(a_type, b); then { span_lint_and_help( @@ -131,7 +131,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { if is_type_diagnostic_item(cx, a, sym!(result_type)); if let ty::Adt(_, substs) = a.kind; if let Some(a_type) = substs.types().next(); - if same_tys(cx, a_type, b); + if TyS::same_type(a_type, b); then { let hint = format!("consider removing `{}()`", snippet(cx, path.span, "TryFrom::try_from")); @@ -148,7 +148,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessConversion { if_chain! { if match_def_path(cx, def_id, &paths::FROM_FROM); - if same_tys(cx, a, b); + if TyS::same_type(a, b); then { let sugg = snippet(cx, args[0].span.source_callsite(), "").into_owned(); diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index 2cdb6486f..9a6750c51 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -40,7 +40,7 @@ use rustc_hir::{ use rustc_infer::infer::TyCtxtInferExt; use rustc_lint::{LateContext, Level, Lint, LintContext}; use rustc_middle::hir::map::Map; -use rustc_middle::ty::{self, layout::IntegerExt, subst::GenericArg, Binder, Ty, TyCtxt, TypeFoldable}; +use rustc_middle::ty::{self, layout::IntegerExt, subst::GenericArg, Ty, TyCtxt, TypeFoldable}; use rustc_span::hygiene::{ExpnKind, MacroKind}; use rustc_span::source_map::original_sp; use rustc_span::symbol::{self, kw, Symbol}; @@ -879,20 +879,6 @@ pub fn return_ty<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, fn_item: hir::HirId) -> T cx.tcx.erase_late_bound_regions(&ret_ty) } -/// Checks if two types are the same. -/// -/// This discards any lifetime annotations, too. -// -// FIXME: this works correctly for lifetimes bounds (`for <'a> Foo<'a>` == -// `for <'b> Foo<'b>`, but not for type parameters). -pub fn same_tys<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, a: Ty<'tcx>, b: Ty<'tcx>) -> bool { - let a = cx.tcx.erase_late_bound_regions(&Binder::bind(a)); - let b = cx.tcx.erase_late_bound_regions(&Binder::bind(b)); - cx.tcx - .infer_ctxt() - .enter(|infcx| infcx.can_eq(cx.param_env, a, b).is_ok()) -} - /// Returns `true` if the given type is an `unsafe` function. pub fn type_is_unsafe_function<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, ty: Ty<'tcx>) -> bool { match ty.kind { From 5bdbc45ae579e7b8f4187bc791abd67924cb626b Mon Sep 17 00:00:00 2001 From: flip1995 Date: Sun, 7 Jun 2020 03:07:48 +0200 Subject: [PATCH 0177/4780] Rustup to rust-lang/rust#71796 --- tests/ui/or_fun_call.fixed | 4 ++-- tests/ui/or_fun_call.stderr | 18 +++++++++++++++--- 2 files changed, 17 insertions(+), 5 deletions(-) diff --git a/tests/ui/or_fun_call.fixed b/tests/ui/or_fun_call.fixed index 7bb08797e..2045ffdb5 100644 --- a/tests/ui/or_fun_call.fixed +++ b/tests/ui/or_fun_call.fixed @@ -29,7 +29,7 @@ fn or_fun_call() { with_enum.unwrap_or(Enum::A(5)); let with_const_fn = Some(Duration::from_secs(1)); - with_const_fn.unwrap_or(Duration::from_secs(5)); + with_const_fn.unwrap_or_else(|| Duration::from_secs(5)); let with_constructor = Some(vec![1]); with_constructor.unwrap_or_else(make); @@ -94,7 +94,7 @@ fn test_or_with_ctors() { let b = "b".to_string(); let _ = Some(Bar("a".to_string(), Duration::from_secs(1))) - .or(Some(Bar(b, Duration::from_secs(2)))); + .or_else(|| Some(Bar(b, Duration::from_secs(2)))); let vec = vec!["foo"]; let _ = opt.ok_or(vec.len()); diff --git a/tests/ui/or_fun_call.stderr b/tests/ui/or_fun_call.stderr index 96d55771e..bc5978b53 100644 --- a/tests/ui/or_fun_call.stderr +++ b/tests/ui/or_fun_call.stderr @@ -1,10 +1,16 @@ +error: use of `unwrap_or` followed by a function call + --> $DIR/or_fun_call.rs:32:19 + | +LL | with_const_fn.unwrap_or(Duration::from_secs(5)); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| Duration::from_secs(5))` + | + = note: `-D clippy::or-fun-call` implied by `-D warnings` + error: use of `unwrap_or` followed by a function call --> $DIR/or_fun_call.rs:35:22 | LL | with_constructor.unwrap_or(make()); | ^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(make)` - | - = note: `-D clippy::or-fun-call` implied by `-D warnings` error: use of `unwrap_or` followed by a call to `new` --> $DIR/or_fun_call.rs:38:5 @@ -78,5 +84,11 @@ error: use of `or` followed by a function call LL | let _ = Some("a".to_string()).or(Some("b".to_string())); | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `or_else(|| Some("b".to_string()))` -error: aborting due to 13 previous errors +error: use of `or` followed by a function call + --> $DIR/or_fun_call.rs:97:10 + | +LL | .or(Some(Bar(b, Duration::from_secs(2)))); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `or_else(|| Some(Bar(b, Duration::from_secs(2))))` + +error: aborting due to 15 previous errors From d9aa26a14dca32e0c4f2718ad1d3322f0de1674d Mon Sep 17 00:00:00 2001 From: flip1995 Date: Sun, 7 Jun 2020 14:54:21 +0200 Subject: [PATCH 0178/4780] Temporarily disable RLS integration test --- .github/workflows/clippy_bors.yml | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/.github/workflows/clippy_bors.yml b/.github/workflows/clippy_bors.yml index 3958ba012..0c80394f0 100644 --- a/.github/workflows/clippy_bors.yml +++ b/.github/workflows/clippy_bors.yml @@ -232,7 +232,8 @@ jobs: matrix: integration: - 'rust-lang/cargo' - - 'rust-lang/rls' + # FIXME: re-enable once fmt_macros is renamed in RLS + # - 'rust-lang/rls' - 'rust-lang/chalk' - 'rust-lang/rustfmt' - 'Marwes/combine' From dc13016ac2df1ce2663660389409b15eb2cf7e40 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Wed, 3 Jun 2020 01:13:57 +0200 Subject: [PATCH 0179/4780] Make let_and_return a late lint pass --- clippy_lints/src/let_and_return.rs | 82 ++++++++++++++++++++++++++++++ clippy_lints/src/lib.rs | 8 +-- clippy_lints/src/returns.rs | 82 ++---------------------------- src/lintlist/mod.rs | 2 +- 4 files changed, 91 insertions(+), 83 deletions(-) create mode 100644 clippy_lints/src/let_and_return.rs diff --git a/clippy_lints/src/let_and_return.rs b/clippy_lints/src/let_and_return.rs new file mode 100644 index 000000000..8b877f696 --- /dev/null +++ b/clippy_lints/src/let_and_return.rs @@ -0,0 +1,82 @@ +use if_chain::if_chain; +use rustc_errors::Applicability; +use rustc_hir::{Block, ExprKind, PatKind, StmtKind}; +use rustc_lint::{LateContext, LateLintPass, LintContext}; +use rustc_middle::lint::in_external_macro; +use rustc_session::{declare_lint_pass, declare_tool_lint}; + +use crate::utils::{in_macro, match_qpath, snippet_opt, span_lint_and_then}; + +declare_clippy_lint! { + /// **What it does:** Checks for `let`-bindings, which are subsequently + /// returned. + /// + /// **Why is this bad?** It is just extraneous code. Remove it to make your code + /// more rusty. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// ```rust + /// fn foo() -> String { + /// let x = String::new(); + /// x + /// } + /// ``` + /// instead, use + /// ``` + /// fn foo() -> String { + /// String::new() + /// } + /// ``` + pub LET_AND_RETURN, + style, + "creating a let-binding and then immediately returning it like `let x = expr; x` at the end of a block" +} + +declare_lint_pass!(LetReturn => [LET_AND_RETURN]); + +impl<'a, 'tcx> LateLintPass<'a, 'tcx> for LetReturn { + fn check_block(&mut self, cx: &LateContext<'a, 'tcx>, block: &'tcx Block<'_>) { + // we need both a let-binding stmt and an expr + if_chain! { + if let Some(retexpr) = block.expr; + if let Some(stmt) = block.stmts.iter().last(); + if let StmtKind::Local(local) = &stmt.kind; + if local.ty.is_none(); + if local.attrs.is_empty(); + if let Some(initexpr) = &local.init; + if let PatKind::Binding(.., ident, _) = local.pat.kind; + if let ExprKind::Path(qpath) = &retexpr.kind; + if match_qpath(qpath, &[&*ident.name.as_str()]); + if !in_external_macro(cx.sess(), initexpr.span); + if !in_external_macro(cx.sess(), retexpr.span); + if !in_external_macro(cx.sess(), local.span); + if !in_macro(local.span); + then { + span_lint_and_then( + cx, + LET_AND_RETURN, + retexpr.span, + "returning the result of a `let` binding from a block", + |err| { + err.span_label(local.span, "unnecessary `let` binding"); + + if let Some(snippet) = snippet_opt(cx, initexpr.span) { + err.multipart_suggestion( + "return the expression directly", + vec![ + (local.span, String::new()), + (retexpr.span, snippet), + ], + Applicability::MachineApplicable, + ); + } else { + err.span_help(initexpr.span, "this expression can be directly returned"); + } + }, + ); + } + } + } +} diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 6f8923b26..6bc9e23ba 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -239,6 +239,7 @@ mod large_const_arrays; mod large_enum_variant; mod large_stack_arrays; mod len_zero; +mod let_and_return; mod let_if_seq; mod let_underscore; mod lifetimes; @@ -596,6 +597,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &large_stack_arrays::LARGE_STACK_ARRAYS, &len_zero::LEN_WITHOUT_IS_EMPTY, &len_zero::LEN_ZERO, + &let_and_return::LET_AND_RETURN, &let_if_seq::USELESS_LET_IF_SEQ, &let_underscore::LET_UNDERSCORE_LOCK, &let_underscore::LET_UNDERSCORE_MUST_USE, @@ -772,7 +774,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: ®ex::INVALID_REGEX, ®ex::REGEX_MACRO, ®ex::TRIVIAL_REGEX, - &returns::LET_AND_RETURN, &returns::NEEDLESS_RETURN, &returns::UNUSED_UNIT, &serde_api::SERDE_API_MISUSE, @@ -1022,6 +1023,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_early_pass(|| box formatting::Formatting); store.register_early_pass(|| box misc_early::MiscEarlyLints); store.register_early_pass(|| box returns::Return); + store.register_late_pass(|| box let_and_return::LetReturn); store.register_early_pass(|| box collapsible_if::CollapsibleIf); store.register_early_pass(|| box items_after_statements::ItemsAfterStatements); store.register_early_pass(|| box precedence::Precedence); @@ -1265,6 +1267,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&large_enum_variant::LARGE_ENUM_VARIANT), LintId::of(&len_zero::LEN_WITHOUT_IS_EMPTY), LintId::of(&len_zero::LEN_ZERO), + LintId::of(&let_and_return::LET_AND_RETURN), LintId::of(&let_underscore::LET_UNDERSCORE_LOCK), LintId::of(&lifetimes::EXTRA_UNUSED_LIFETIMES), LintId::of(&lifetimes::NEEDLESS_LIFETIMES), @@ -1390,7 +1393,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(®ex::INVALID_REGEX), LintId::of(®ex::REGEX_MACRO), LintId::of(®ex::TRIVIAL_REGEX), - LintId::of(&returns::LET_AND_RETURN), LintId::of(&returns::NEEDLESS_RETURN), LintId::of(&returns::UNUSED_UNIT), LintId::of(&serde_api::SERDE_API_MISUSE), @@ -1474,6 +1476,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&inherent_to_string::INHERENT_TO_STRING), LintId::of(&len_zero::LEN_WITHOUT_IS_EMPTY), LintId::of(&len_zero::LEN_ZERO), + LintId::of(&let_and_return::LET_AND_RETURN), LintId::of(&literal_representation::INCONSISTENT_DIGIT_GROUPING), LintId::of(&loops::EMPTY_LOOP), LintId::of(&loops::FOR_KV_MAP), @@ -1526,7 +1529,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES), LintId::of(®ex::REGEX_MACRO), LintId::of(®ex::TRIVIAL_REGEX), - LintId::of(&returns::LET_AND_RETURN), LintId::of(&returns::NEEDLESS_RETURN), LintId::of(&returns::UNUSED_UNIT), LintId::of(&single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS), diff --git a/clippy_lints/src/returns.rs b/clippy_lints/src/returns.rs index 35464f629..3c9397441 100644 --- a/clippy_lints/src/returns.rs +++ b/clippy_lints/src/returns.rs @@ -8,7 +8,7 @@ use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; use rustc_span::BytePos; -use crate::utils::{in_macro, match_path_ast, snippet_opt, span_lint_and_sugg, span_lint_and_then}; +use crate::utils::{snippet_opt, span_lint_and_sugg, span_lint_and_then}; declare_clippy_lint! { /// **What it does:** Checks for return statements at the end of a block. @@ -36,33 +36,6 @@ declare_clippy_lint! { "using a return statement like `return expr;` where an expression would suffice" } -declare_clippy_lint! { - /// **What it does:** Checks for `let`-bindings, which are subsequently - /// returned. - /// - /// **Why is this bad?** It is just extraneous code. Remove it to make your code - /// more rusty. - /// - /// **Known problems:** None. - /// - /// **Example:** - /// ```rust - /// fn foo() -> String { - /// let x = String::new(); - /// x - /// } - /// ``` - /// instead, use - /// ``` - /// fn foo() -> String { - /// String::new() - /// } - /// ``` - pub LET_AND_RETURN, - style, - "creating a let-binding and then immediately returning it like `let x = expr; x` at the end of a block" -} - declare_clippy_lint! { /// **What it does:** Checks for unit (`()`) expressions that can be removed. /// @@ -90,7 +63,7 @@ enum RetReplacement { Block, } -declare_lint_pass!(Return => [NEEDLESS_RETURN, LET_AND_RETURN, UNUSED_UNIT]); +declare_lint_pass!(Return => [NEEDLESS_RETURN, UNUSED_UNIT]); impl Return { // Check the final stmt or expr in a block for unnecessary return. @@ -105,7 +78,7 @@ impl Return { } } - // Check a the final expression in a block if it's a return. + // Check the final expression in a block if it's a return. fn check_final_expr( &mut self, cx: &EarlyContext<'_>, @@ -186,54 +159,6 @@ impl Return { }, } } - - // Check for "let x = EXPR; x" - fn check_let_return(cx: &EarlyContext<'_>, block: &ast::Block) { - let mut it = block.stmts.iter(); - - // we need both a let-binding stmt and an expr - if_chain! { - if let Some(retexpr) = it.next_back(); - if let ast::StmtKind::Expr(ref retexpr) = retexpr.kind; - if let Some(stmt) = it.next_back(); - if let ast::StmtKind::Local(ref local) = stmt.kind; - // don't lint in the presence of type inference - if local.ty.is_none(); - if local.attrs.is_empty(); - if let Some(ref initexpr) = local.init; - if let ast::PatKind::Ident(_, ident, _) = local.pat.kind; - if let ast::ExprKind::Path(_, ref path) = retexpr.kind; - if match_path_ast(path, &[&*ident.name.as_str()]); - if !in_external_macro(cx.sess(), initexpr.span); - if !in_external_macro(cx.sess(), retexpr.span); - if !in_external_macro(cx.sess(), local.span); - if !in_macro(local.span); - then { - span_lint_and_then( - cx, - LET_AND_RETURN, - retexpr.span, - "returning the result of a `let` binding from a block", - |err| { - err.span_label(local.span, "unnecessary `let` binding"); - - if let Some(snippet) = snippet_opt(cx, initexpr.span) { - err.multipart_suggestion( - "return the expression directly", - vec![ - (local.span, String::new()), - (retexpr.span, snippet), - ], - Applicability::MachineApplicable, - ); - } else { - err.span_help(initexpr.span, "this expression can be directly returned"); - } - }, - ); - } - } - } } impl EarlyLintPass for Return { @@ -254,7 +179,6 @@ impl EarlyLintPass for Return { } fn check_block(&mut self, cx: &EarlyContext<'_>, block: &ast::Block) { - Self::check_let_return(cx, block); if_chain! { if let Some(ref stmt) = block.stmts.last(); if let ast::StmtKind::Expr(ref expr) = stmt.kind; diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs index d5d07ccb2..bb191f9be 100644 --- a/src/lintlist/mod.rs +++ b/src/lintlist/mod.rs @@ -1023,7 +1023,7 @@ pub static ref ALL_LINTS: Vec = vec![ group: "style", desc: "creating a let-binding and then immediately returning it like `let x = expr; x` at the end of a block", deprecation: None, - module: "returns", + module: "let_and_return", }, Lint { name: "let_underscore_lock", From 9c205d7b1baa982ae7063d57b18088ecf28df83b Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Sat, 6 Jun 2020 21:51:41 +0200 Subject: [PATCH 0180/4780] Rename let_and_return test for consistency with the lint name --- tests/ui/{let_return.rs => let_and_return.rs} | 0 tests/ui/{let_return.stderr => let_and_return.stderr} | 4 ++-- 2 files changed, 2 insertions(+), 2 deletions(-) rename tests/ui/{let_return.rs => let_and_return.rs} (100%) rename tests/ui/{let_return.stderr => let_and_return.stderr} (89%) diff --git a/tests/ui/let_return.rs b/tests/ui/let_and_return.rs similarity index 100% rename from tests/ui/let_return.rs rename to tests/ui/let_and_return.rs diff --git a/tests/ui/let_return.stderr b/tests/ui/let_and_return.stderr similarity index 89% rename from tests/ui/let_return.stderr rename to tests/ui/let_and_return.stderr index 128a22c86..eacf948b3 100644 --- a/tests/ui/let_return.stderr +++ b/tests/ui/let_and_return.stderr @@ -1,5 +1,5 @@ error: returning the result of a `let` binding from a block - --> $DIR/let_return.rs:7:5 + --> $DIR/let_and_return.rs:7:5 | LL | let x = 5; | ---------- unnecessary `let` binding @@ -14,7 +14,7 @@ LL | 5 | error: returning the result of a `let` binding from a block - --> $DIR/let_return.rs:13:9 + --> $DIR/let_and_return.rs:13:9 | LL | let x = 5; | ---------- unnecessary `let` binding From dac8a3c1ca19d2b5934ecbe2ed79ae6c156fd885 Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Sun, 7 Jun 2020 00:30:39 +0200 Subject: [PATCH 0181/4780] let_and_return: do not lint if last statement borrows --- clippy_lints/src/let_and_return.rs | 61 ++++++++++++++++++++++++++- clippy_lints/src/utils/mod.rs | 2 +- tests/ui/let_and_return.rs | 68 ++++++++++++++++++++++++++++++ 3 files changed, 129 insertions(+), 2 deletions(-) diff --git a/clippy_lints/src/let_and_return.rs b/clippy_lints/src/let_and_return.rs index 8b877f696..6d3fb317b 100644 --- a/clippy_lints/src/let_and_return.rs +++ b/clippy_lints/src/let_and_return.rs @@ -1,8 +1,12 @@ use if_chain::if_chain; use rustc_errors::Applicability; -use rustc_hir::{Block, ExprKind, PatKind, StmtKind}; +use rustc_hir::def_id::DefId; +use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor}; +use rustc_hir::{Block, Expr, ExprKind, PatKind, StmtKind}; use rustc_lint::{LateContext, LateLintPass, LintContext}; +use rustc_middle::hir::map::Map; use rustc_middle::lint::in_external_macro; +use rustc_middle::ty::subst::GenericArgKind; use rustc_session::{declare_lint_pass, declare_tool_lint}; use crate::utils::{in_macro, match_qpath, snippet_opt, span_lint_and_then}; @@ -49,6 +53,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for LetReturn { if let PatKind::Binding(.., ident, _) = local.pat.kind; if let ExprKind::Path(qpath) = &retexpr.kind; if match_qpath(qpath, &[&*ident.name.as_str()]); + if !last_statement_borrows(cx, initexpr); if !in_external_macro(cx.sess(), initexpr.span); if !in_external_macro(cx.sess(), retexpr.span); if !in_external_macro(cx.sess(), local.span); @@ -80,3 +85,57 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for LetReturn { } } } + +fn last_statement_borrows<'tcx>(cx: &LateContext<'_, 'tcx>, expr: &'tcx Expr<'tcx>) -> bool { + let mut visitor = BorrowVisitor { cx, borrows: false }; + walk_expr(&mut visitor, expr); + visitor.borrows +} + +struct BorrowVisitor<'a, 'tcx> { + cx: &'a LateContext<'a, 'tcx>, + borrows: bool, +} + +impl BorrowVisitor<'_, '_> { + fn fn_def_id(&self, expr: &Expr<'_>) -> Option { + match &expr.kind { + ExprKind::MethodCall(..) => self.cx.tables.type_dependent_def_id(expr.hir_id), + ExprKind::Call( + Expr { + kind: ExprKind::Path(qpath), + .. + }, + .., + ) => self.cx.tables.qpath_res(qpath, expr.hir_id).opt_def_id(), + _ => None, + } + } +} + +impl<'tcx> Visitor<'tcx> for BorrowVisitor<'_, 'tcx> { + type Map = Map<'tcx>; + + fn visit_expr(&mut self, expr: &'tcx Expr<'_>) { + if self.borrows { + return; + } + + if let Some(def_id) = self.fn_def_id(expr) { + self.borrows = self + .cx + .tcx + .fn_sig(def_id) + .output() + .skip_binder() + .walk() + .any(|arg| matches!(arg.unpack(), GenericArgKind::Lifetime(_))); + } + + walk_expr(self, expr); + } + + fn nested_visit_map(&mut self) -> NestedVisitorMap { + NestedVisitorMap::None + } +} diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index 06638e718..39410acea 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -400,7 +400,7 @@ pub fn method_calls<'tcx>( /// Matches an `Expr` against a chain of methods, and return the matched `Expr`s. /// /// For example, if `expr` represents the `.baz()` in `foo.bar().baz()`, -/// `matched_method_chain(expr, &["bar", "baz"])` will return a `Vec` +/// `method_chain_args(expr, &["bar", "baz"])` will return a `Vec` /// containing the `Expr`s for /// `.bar()` and `.baz()` pub fn method_chain_args<'a>(expr: &'a Expr<'_>, methods: &[&str]) -> Option]>> { diff --git a/tests/ui/let_and_return.rs b/tests/ui/let_and_return.rs index 23645d48f..09614b8c1 100644 --- a/tests/ui/let_and_return.rs +++ b/tests/ui/let_and_return.rs @@ -67,4 +67,72 @@ macro_rules! tuple_encode { tuple_encode!(T0, T1, T2, T3, T4, T5, T6, T7); +mod no_lint_if_stmt_borrows { + mod issue_3792 { + use std::io::{self, BufRead, Stdin}; + + fn read_line() -> String { + let stdin = io::stdin(); + let line = stdin.lock().lines().next().unwrap().unwrap(); + line + } + } + + mod issue_3324 { + use std::cell::RefCell; + use std::rc::{Rc, Weak}; + + fn test(value: Weak>) -> u32 { + let value = value.upgrade().unwrap(); + let ret = value.borrow().baz(); + ret + } + + struct Bar {} + + impl Bar { + fn new() -> Self { + Bar {} + } + fn baz(&self) -> u32 { + 0 + } + } + + fn main() { + let a = Rc::new(RefCell::new(Bar::new())); + let b = Rc::downgrade(&a); + test(b); + } + } + + mod free_function { + struct Inner; + + struct Foo<'a> { + inner: &'a Inner, + } + + impl Drop for Foo<'_> { + fn drop(&mut self) {} + } + + impl Foo<'_> { + fn value(&self) -> i32 { + 42 + } + } + + fn some_foo(inner: &Inner) -> Foo<'_> { + Foo { inner } + } + + fn test() -> i32 { + let x = Inner {}; + let value = some_foo(&x).value(); + value + } + } +} + fn main() {} From ebfc1da07d2cd1cba87a3df79c5ffbfc0d25618c Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Sun, 7 Jun 2020 20:38:28 +0200 Subject: [PATCH 0182/4780] reversed_empty_ranges: don't lint N..N except in for loop arg --- clippy_lints/src/ranges.rs | 62 +++++++++---------- tests/ui/reversed_empty_ranges_fixable.fixed | 8 +-- tests/ui/reversed_empty_ranges_fixable.rs | 8 +-- tests/ui/reversed_empty_ranges_fixable.stderr | 16 ++--- tests/ui/reversed_empty_ranges_unfixable.rs | 5 +- .../ui/reversed_empty_ranges_unfixable.stderr | 20 +++--- 6 files changed, 52 insertions(+), 67 deletions(-) diff --git a/clippy_lints/src/ranges.rs b/clippy_lints/src/ranges.rs index 1eb26d97e..45de4d293 100644 --- a/clippy_lints/src/ranges.rs +++ b/clippy_lints/src/ranges.rs @@ -241,14 +241,26 @@ fn check_inclusive_range_minus_one(cx: &LateContext<'_, '_>, expr: &Expr<'_>) { } fn check_reversed_empty_range(cx: &LateContext<'_, '_>, expr: &Expr<'_>) { - fn inside_indexing_expr<'a>(cx: &'a LateContext<'_, '_>, expr: &Expr<'_>) -> Option<&'a Expr<'a>> { - match get_parent_expr(cx, expr) { - parent_expr @ Some(Expr { + fn inside_indexing_expr<'a>(cx: &'a LateContext<'_, '_>, expr: &Expr<'_>) -> bool { + matches!( + get_parent_expr(cx, expr), + Some(Expr { kind: ExprKind::Index(..), .. - }) => parent_expr, - _ => None, + }) + ) + } + + fn is_for_loop_arg(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool { + let mut cur_expr = expr; + while let Some(parent_expr) = get_parent_expr(cx, cur_expr) { + match higher::for_loop(parent_expr) { + Some((_, args, _)) if args.hir_id == expr.hir_id => return true, + _ => cur_expr = parent_expr, + } } + + false } fn is_empty_range(limits: RangeLimits, ordering: Ordering) -> bool { @@ -267,34 +279,18 @@ fn check_reversed_empty_range(cx: &LateContext<'_, '_>, expr: &Expr<'_>) { if let Some(ordering) = Constant::partial_cmp(cx.tcx, ty, &start_idx, &end_idx); if is_empty_range(limits, ordering); then { - if let Some(parent_expr) = inside_indexing_expr(cx, expr) { - let (reason, outcome) = if ordering == Ordering::Equal { - ("empty", "always yield an empty slice") - } else { - ("reversed", "panic at run-time") - }; - - span_lint_and_then( - cx, - REVERSED_EMPTY_RANGES, - expr.span, - &format!("this range is {} and using it to index a slice will {}", reason, outcome), - |diag| { - if_chain! { - if ordering == Ordering::Equal; - if let ty::Slice(slice_ty) = cx.tables.expr_ty(parent_expr).kind; - then { - diag.span_suggestion( - parent_expr.span, - "if you want an empty slice, use", - format!("[] as &[{}]", slice_ty), - Applicability::MaybeIncorrect - ); - } - } - } - ); - } else { + if inside_indexing_expr(cx, expr) { + // Avoid linting `N..N` as it has proven to be useful, see #5689 and #5628 ... + if ordering != Ordering::Equal { + span_lint( + cx, + REVERSED_EMPTY_RANGES, + expr.span, + "this range is reversed and using it to index a slice will panic at run-time", + ); + } + // ... except in for loop arguments for backwards compatibility with `reverse_range_loop` + } else if ordering != Ordering::Equal || is_for_loop_arg(cx, expr) { span_lint_and_then( cx, REVERSED_EMPTY_RANGES, diff --git a/tests/ui/reversed_empty_ranges_fixable.fixed b/tests/ui/reversed_empty_ranges_fixable.fixed index 332c0427e..79e482eec 100644 --- a/tests/ui/reversed_empty_ranges_fixable.fixed +++ b/tests/ui/reversed_empty_ranges_fixable.fixed @@ -4,8 +4,6 @@ const ANSWER: i32 = 42; fn main() { - let arr = [1, 2, 3, 4, 5]; - // These should be linted: (21..=42).rev().for_each(|x| println!("{}", x)); @@ -14,16 +12,18 @@ fn main() { for _ in (-42..=-21).rev() {} for _ in (21u32..42u32).rev() {} - let _ = &[] as &[i32]; - // These should be ignored as they are not empty ranges: (21..=42).for_each(|x| println!("{}", x)); (21..42).for_each(|x| println!("{}", x)); + let arr = [1, 2, 3, 4, 5]; let _ = &arr[1..=3]; let _ = &arr[1..3]; for _ in 21..=42 {} for _ in 21..42 {} + + // This range is empty but should be ignored, see issue #5689 + let _ = &arr[0..0]; } diff --git a/tests/ui/reversed_empty_ranges_fixable.rs b/tests/ui/reversed_empty_ranges_fixable.rs index 901ec8bcc..b2e8bf337 100644 --- a/tests/ui/reversed_empty_ranges_fixable.rs +++ b/tests/ui/reversed_empty_ranges_fixable.rs @@ -4,8 +4,6 @@ const ANSWER: i32 = 42; fn main() { - let arr = [1, 2, 3, 4, 5]; - // These should be linted: (42..=21).for_each(|x| println!("{}", x)); @@ -14,16 +12,18 @@ fn main() { for _ in -21..=-42 {} for _ in 42u32..21u32 {} - let _ = &arr[3..3]; - // These should be ignored as they are not empty ranges: (21..=42).for_each(|x| println!("{}", x)); (21..42).for_each(|x| println!("{}", x)); + let arr = [1, 2, 3, 4, 5]; let _ = &arr[1..=3]; let _ = &arr[1..3]; for _ in 21..=42 {} for _ in 21..42 {} + + // This range is empty but should be ignored, see issue #5689 + let _ = &arr[0..0]; } diff --git a/tests/ui/reversed_empty_ranges_fixable.stderr b/tests/ui/reversed_empty_ranges_fixable.stderr index 9a646fd99..de83c4f3d 100644 --- a/tests/ui/reversed_empty_ranges_fixable.stderr +++ b/tests/ui/reversed_empty_ranges_fixable.stderr @@ -1,5 +1,5 @@ error: this range is empty so it will yield no values - --> $DIR/reversed_empty_ranges_fixable.rs:11:5 + --> $DIR/reversed_empty_ranges_fixable.rs:9:5 | LL | (42..=21).for_each(|x| println!("{}", x)); | ^^^^^^^^^ @@ -11,7 +11,7 @@ LL | (21..=42).rev().for_each(|x| println!("{}", x)); | ^^^^^^^^^^^^^^^ error: this range is empty so it will yield no values - --> $DIR/reversed_empty_ranges_fixable.rs:12:13 + --> $DIR/reversed_empty_ranges_fixable.rs:10:13 | LL | let _ = (ANSWER..21).filter(|x| x % 2 == 0).take(10).collect::>(); | ^^^^^^^^^^^^ @@ -22,7 +22,7 @@ LL | let _ = (21..ANSWER).rev().filter(|x| x % 2 == 0).take(10).collect:: $DIR/reversed_empty_ranges_fixable.rs:14:14 + --> $DIR/reversed_empty_ranges_fixable.rs:12:14 | LL | for _ in -21..=-42 {} | ^^^^^^^^^ @@ -33,7 +33,7 @@ LL | for _ in (-42..=-21).rev() {} | ^^^^^^^^^^^^^^^^^ error: this range is empty so it will yield no values - --> $DIR/reversed_empty_ranges_fixable.rs:15:14 + --> $DIR/reversed_empty_ranges_fixable.rs:13:14 | LL | for _ in 42u32..21u32 {} | ^^^^^^^^^^^^ @@ -43,11 +43,5 @@ help: consider using the following if you are attempting to iterate over this ra LL | for _ in (21u32..42u32).rev() {} | ^^^^^^^^^^^^^^^^^^^^ -error: this range is empty and using it to index a slice will always yield an empty slice - --> $DIR/reversed_empty_ranges_fixable.rs:17:18 - | -LL | let _ = &arr[3..3]; - | ----^^^^- help: if you want an empty slice, use: `[] as &[i32]` - -error: aborting due to 5 previous errors +error: aborting due to 4 previous errors diff --git a/tests/ui/reversed_empty_ranges_unfixable.rs b/tests/ui/reversed_empty_ranges_unfixable.rs index 561a35625..264d3d1e9 100644 --- a/tests/ui/reversed_empty_ranges_unfixable.rs +++ b/tests/ui/reversed_empty_ranges_unfixable.rs @@ -4,11 +4,12 @@ const ANSWER: i32 = 42; const SOME_NUM: usize = 3; fn main() { - let _ = (42 + 10..42 + 10).map(|x| x / 2).find(|&x| x == 21); - let arr = [1, 2, 3, 4, 5]; let _ = &arr[3usize..=1usize]; let _ = &arr[SOME_NUM..1]; for _ in ANSWER..ANSWER {} + + // Should not be linted, see issue #5689 + let _ = (42 + 10..42 + 10).map(|x| x / 2).find(|&x| x == 21); } diff --git a/tests/ui/reversed_empty_ranges_unfixable.stderr b/tests/ui/reversed_empty_ranges_unfixable.stderr index 240188cbb..f23d4eb0f 100644 --- a/tests/ui/reversed_empty_ranges_unfixable.stderr +++ b/tests/ui/reversed_empty_ranges_unfixable.stderr @@ -1,28 +1,22 @@ -error: this range is empty so it will yield no values - --> $DIR/reversed_empty_ranges_unfixable.rs:7:13 +error: this range is reversed and using it to index a slice will panic at run-time + --> $DIR/reversed_empty_ranges_unfixable.rs:8:18 | -LL | let _ = (42 + 10..42 + 10).map(|x| x / 2).find(|&x| x == 21); - | ^^^^^^^^^^^^^^^^^^ +LL | let _ = &arr[3usize..=1usize]; + | ^^^^^^^^^^^^^^^ | = note: `-D clippy::reversed-empty-ranges` implied by `-D warnings` error: this range is reversed and using it to index a slice will panic at run-time - --> $DIR/reversed_empty_ranges_unfixable.rs:10:18 - | -LL | let _ = &arr[3usize..=1usize]; - | ^^^^^^^^^^^^^^^ - -error: this range is reversed and using it to index a slice will panic at run-time - --> $DIR/reversed_empty_ranges_unfixable.rs:11:18 + --> $DIR/reversed_empty_ranges_unfixable.rs:9:18 | LL | let _ = &arr[SOME_NUM..1]; | ^^^^^^^^^^^ error: this range is empty so it will yield no values - --> $DIR/reversed_empty_ranges_unfixable.rs:13:14 + --> $DIR/reversed_empty_ranges_unfixable.rs:11:14 | LL | for _ in ANSWER..ANSWER {} | ^^^^^^^^^^^^^^ -error: aborting due to 4 previous errors +error: aborting due to 3 previous errors From 7b6dc7b33dc437a59330ef3f5426102ca60fbf51 Mon Sep 17 00:00:00 2001 From: Mazdak Farrokhzad Date: Thu, 19 Mar 2020 14:14:52 +0100 Subject: [PATCH 0183/4780] add `unnested_or_patterns` lint --- CHANGELOG.md | 1 + clippy_lints/src/lib.rs | 7 + clippy_lints/src/unnested_or_patterns.rs | 407 +++++++++++++++++ clippy_lints/src/utils/ast_utils.rs | 525 ++++++++++++++++++++++ clippy_lints/src/utils/hir_utils.rs | 10 +- clippy_lints/src/utils/mod.rs | 3 +- src/lintlist/mod.rs | 7 + tests/ui/neg_cmp_op_on_partial_ord.rs | 1 + tests/ui/neg_cmp_op_on_partial_ord.stderr | 8 +- tests/ui/unnested_or_patterns.fixed | 41 ++ tests/ui/unnested_or_patterns.rs | 41 ++ tests/ui/unnested_or_patterns.stderr | 267 +++++++++++ tests/ui/wildcard_enum_match_arm.fixed | 3 +- tests/ui/wildcard_enum_match_arm.rs | 3 +- tests/ui/wildcard_enum_match_arm.stderr | 10 +- 15 files changed, 1314 insertions(+), 20 deletions(-) create mode 100644 clippy_lints/src/unnested_or_patterns.rs create mode 100755 clippy_lints/src/utils/ast_utils.rs create mode 100644 tests/ui/unnested_or_patterns.fixed create mode 100644 tests/ui/unnested_or_patterns.rs create mode 100644 tests/ui/unnested_or_patterns.stderr diff --git a/CHANGELOG.md b/CHANGELOG.md index a4a184480..adc945a69 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1683,6 +1683,7 @@ Released 2018-09-13 [`unnecessary_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_unwrap [`unneeded_field_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern [`unneeded_wildcard_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_wildcard_pattern +[`unnested_or_patterns`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnested_or_patterns [`unreachable`]: https://rust-lang.github.io/rust-clippy/master/index.html#unreachable [`unreadable_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal [`unsafe_derive_deserialize`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsafe_derive_deserialize diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 6f8923b26..9809f953d 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -1,5 +1,6 @@ // error-pattern:cargo-clippy +#![feature(bindings_after_at)] #![feature(box_syntax)] #![feature(box_patterns)] #![feature(or_patterns)] @@ -12,6 +13,7 @@ #![cfg_attr(feature = "deny-warnings", deny(warnings))] #![feature(crate_visibility_modifier)] #![feature(concat_idents)] +#![feature(drain_filter)] // FIXME: switch to something more ergonomic here, once available. // (Currently there is no way to opt into sysroot crates without `extern crate`.) @@ -319,6 +321,7 @@ mod types; mod unicode; mod unnamed_address; mod unnecessary_sort_by; +mod unnested_or_patterns; mod unsafe_removed_from_name; mod unused_io_amount; mod unused_self; @@ -836,6 +839,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &unnamed_address::FN_ADDRESS_COMPARISONS, &unnamed_address::VTABLE_ADDRESS_COMPARISONS, &unnecessary_sort_by::UNNECESSARY_SORT_BY, + &unnested_or_patterns::UNNESTED_OR_PATTERNS, &unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME, &unused_io_amount::UNUSED_IO_AMOUNT, &unused_self::UNUSED_SELF, @@ -1073,6 +1077,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_early_pass(move || box non_expressive_names::NonExpressiveNames { single_char_binding_names_threshold, }); + store.register_early_pass(|| box unnested_or_patterns::UnnestedOrPatterns); store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![ LintId::of(&arithmetic::FLOAT_ARITHMETIC), @@ -1433,6 +1438,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&unnamed_address::FN_ADDRESS_COMPARISONS), LintId::of(&unnamed_address::VTABLE_ADDRESS_COMPARISONS), LintId::of(&unnecessary_sort_by::UNNECESSARY_SORT_BY), + LintId::of(&unnested_or_patterns::UNNESTED_OR_PATTERNS), LintId::of(&unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME), LintId::of(&unused_io_amount::UNUSED_IO_AMOUNT), LintId::of(&unwrap::PANICKING_UNWRAP), @@ -1616,6 +1622,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&types::UNNECESSARY_CAST), LintId::of(&types::VEC_BOX), LintId::of(&unnecessary_sort_by::UNNECESSARY_SORT_BY), + LintId::of(&unnested_or_patterns::UNNESTED_OR_PATTERNS), LintId::of(&unwrap::UNNECESSARY_UNWRAP), LintId::of(&useless_conversion::USELESS_CONVERSION), LintId::of(&zero_div_zero::ZERO_DIVIDED_BY_ZERO), diff --git a/clippy_lints/src/unnested_or_patterns.rs b/clippy_lints/src/unnested_or_patterns.rs new file mode 100644 index 000000000..2723af03c --- /dev/null +++ b/clippy_lints/src/unnested_or_patterns.rs @@ -0,0 +1,407 @@ +#![allow(clippy::wildcard_imports, clippy::enum_glob_use)] + +use crate::utils::ast_utils::{eq_field_pat, eq_id, eq_pat, eq_path}; +use crate::utils::{over, span_lint_and_then}; +use rustc_ast::ast::{self, Pat, PatKind, PatKind::*, DUMMY_NODE_ID}; +use rustc_ast::mut_visit::*; +use rustc_ast::ptr::P; +use rustc_ast_pretty::pprust; +use rustc_errors::Applicability; +use rustc_lint::{EarlyContext, EarlyLintPass}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_span::DUMMY_SP; + +use std::cell::Cell; +use std::mem; + +declare_clippy_lint! { + /// **What it does:** + /// + /// Checks for unnested or-patterns, e.g., `Some(0) | Some(2)` and + /// suggests replacing the pattern with a nested one, `Some(0 | 2)`. + /// + /// Another way to think of this is that it rewrites patterns in + /// *disjunctive normal form (DNF)* into *conjunctive normal form (CNF)*. + /// + /// **Why is this bad?** + /// + /// In the example above, `Some` is repeated, which unncessarily complicates the pattern. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// ```rust + /// fn main() { + /// if let Some(0) | Some(2) = Some(0) {} + /// } + /// ``` + /// Use instead: + /// ```rust + /// #![feature(or_patterns)] + /// + /// fn main() { + /// if let Some(0 | 2) = Some(0) {} + /// } + /// ``` + pub UNNESTED_OR_PATTERNS, + complexity, + "unnested or-patterns, e.g., `Foo(Bar) | Foo(Baz) instead of `Foo(Bar | Baz)`" +} + +declare_lint_pass!(UnnestedOrPatterns => [UNNESTED_OR_PATTERNS]); + +impl EarlyLintPass for UnnestedOrPatterns { + fn check_arm(&mut self, cx: &EarlyContext<'_>, a: &ast::Arm) { + lint_unnested_or_patterns(cx, &a.pat); + } + + fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &ast::Expr) { + if let ast::ExprKind::Let(pat, _) = &e.kind { + lint_unnested_or_patterns(cx, pat); + } + } + + fn check_param(&mut self, cx: &EarlyContext<'_>, p: &ast::Param) { + lint_unnested_or_patterns(cx, &p.pat); + } + + fn check_local(&mut self, cx: &EarlyContext<'_>, l: &ast::Local) { + lint_unnested_or_patterns(cx, &l.pat); + } +} + +fn lint_unnested_or_patterns(cx: &EarlyContext<'_>, pat: &Pat) { + if !cx.sess.opts.unstable_features.is_nightly_build() { + // User cannot do `#![feature(or_patterns)]`, so bail. + return; + } + + if let Ident(.., None) | Lit(_) | Wild | Path(..) | Range(..) | Rest | MacCall(_) = pat.kind { + // This is a leaf pattern, so cloning is unprofitable. + return; + } + + let mut pat = P(pat.clone()); + + // Nix all the paren patterns everywhere so that they aren't in our way. + remove_all_parens(&mut pat); + + // Transform all unnested or-patterns into nested ones, and if there were none, quit. + if !unnest_or_patterns(&mut pat) { + return; + } + + span_lint_and_then(cx, UNNESTED_OR_PATTERNS, pat.span, "unnested or-patterns", |db| { + insert_necessary_parens(&mut pat); + db.span_suggestion_verbose( + pat.span, + "nest the patterns", + pprust::pat_to_string(&pat), + Applicability::MachineApplicable, + ); + }); +} + +/// Remove all `(p)` patterns in `pat`. +fn remove_all_parens(pat: &mut P) { + struct Visitor; + impl MutVisitor for Visitor { + fn visit_pat(&mut self, pat: &mut P) { + noop_visit_pat(pat, self); + let inner = match &mut pat.kind { + Paren(i) => mem::replace(&mut i.kind, Wild), + _ => return, + }; + pat.kind = inner; + } + } + Visitor.visit_pat(pat); +} + +/// Insert parens where necessary according to Rust's precedence rules for patterns. +fn insert_necessary_parens(pat: &mut P) { + struct Visitor; + impl MutVisitor for Visitor { + fn visit_pat(&mut self, pat: &mut P) { + use ast::{BindingMode::*, Mutability::*}; + noop_visit_pat(pat, self); + let target = match &mut pat.kind { + // `i @ a | b`, `box a | b`, and `& mut? a | b`. + Ident(.., Some(p)) | Box(p) | Ref(p, _) if matches!(&p.kind, Or(ps) if ps.len() > 1) => p, + Ref(p, Not) if matches!(p.kind, Ident(ByValue(Mut), ..)) => p, // `&(mut x)` + _ => return, + }; + target.kind = Paren(P(take_pat(target))); + } + } + Visitor.visit_pat(pat); +} + +/// Unnest or-patterns `p0 | ... | p1` in the pattern `pat`. +/// For example, this would transform `Some(0) | FOO | Some(2)` into `Some(0 | 2) | FOO`. +fn unnest_or_patterns(pat: &mut P) -> bool { + struct Visitor { + changed: bool, + } + impl MutVisitor for Visitor { + fn visit_pat(&mut self, p: &mut P) { + // This is a bottom up transformation, so recurse first. + noop_visit_pat(p, self); + + // Don't have an or-pattern? Just quit early on. + let alternatives = match &mut p.kind { + Or(ps) => ps, + _ => return, + }; + + // Collapse or-patterns directly nested in or-patterns. + let mut idx = 0; + let mut this_level_changed = false; + while idx < alternatives.len() { + let inner = if let Or(ps) = &mut alternatives[idx].kind { + mem::take(ps) + } else { + idx += 1; + continue; + }; + this_level_changed = true; + alternatives.splice(idx..=idx, inner); + } + + // Focus on `p_n` and then try to transform all `p_i` where `i > n`. + let mut focus_idx = 0; + while focus_idx < alternatives.len() { + this_level_changed |= transform_with_focus_on_idx(alternatives, focus_idx); + focus_idx += 1; + } + self.changed |= this_level_changed; + + // Deal with `Some(Some(0)) | Some(Some(1))`. + if this_level_changed { + noop_visit_pat(p, self); + } + } + } + + let mut visitor = Visitor { changed: false }; + visitor.visit_pat(pat); + visitor.changed +} + +/// Match `$scrutinee` against `$pat` and extract `$then` from it. +/// Panics if there is no match. +macro_rules! always_pat { + ($scrutinee:expr, $pat:pat => $then:expr) => { + match $scrutinee { + $pat => $then, + _ => unreachable!(), + } + }; +} + +/// Focus on `focus_idx` in `alternatives`, +/// attempting to extend it with elements of the same constructor `C` +/// in `alternatives[focus_idx + 1..]`. +fn transform_with_focus_on_idx(alternatives: &mut Vec>, focus_idx: usize) -> bool { + // Extract the kind; we'll need to make some changes in it. + let mut focus_kind = mem::replace(&mut alternatives[focus_idx].kind, PatKind::Wild); + // We'll focus on `alternatives[focus_idx]`, + // so we're draining from `alternatives[focus_idx + 1..]`. + let start = focus_idx + 1; + + // We're trying to find whatever kind (~"constructor") we found in `alternatives[start..]`. + let changed = match &mut focus_kind { + // These pattern forms are "leafs" and do not have sub-patterns. + // Therefore they are not some form of constructor `C`, + // with which a pattern `C(P0)` may be formed, + // which we would want to join with other `C(Pj)`s. + Ident(.., None) | Lit(_) | Wild | Path(..) | Range(..) | Rest | MacCall(_) + // Dealt with elsewhere. + | Or(_) | Paren(_) => false, + // Transform `box x | ... | box y` into `box (x | y)`. + // + // The cases below until `Slice(...)` deal *singleton* products. + // These patterns have the shape `C(p)`, and not e.g., `C(p0, ..., pn)`. + Box(target) => extend_with_matching( + target, start, alternatives, + |k| matches!(k, Box(_)), + |k| always_pat!(k, Box(p) => p), + ), + // Transform `&m x | ... | &m y` into `&m (x, y)`. + Ref(target, m1) => extend_with_matching( + target, start, alternatives, + |k| matches!(k, Ref(_, m2) if m1 == m2), // Mutabilities must match. + |k| always_pat!(k, Ref(p, _) => p), + ), + // Transform `b @ p0 | ... b @ p1` into `b @ (p0 | p1)`. + Ident(b1, i1, Some(target)) => extend_with_matching( + target, start, alternatives, + // Binding names must match. + |k| matches!(k, Ident(b2, i2, Some(_)) if b1 == b2 && eq_id(*i1, *i2)), + |k| always_pat!(k, Ident(_, _, Some(p)) => p), + ), + // Transform `[pre, x, post] | ... | [pre, y, post]` into `[pre, x | y, post]`. + Slice(ps1) => extend_with_matching_product( + ps1, start, alternatives, + |k, ps1, idx| matches!(k, Slice(ps2) if eq_pre_post(ps1, ps2, idx)), + |k| always_pat!(k, Slice(ps) => ps), + ), + // Transform `(pre, x, post) | ... | (pre, y, post)` into `(pre, x | y, post]`. + Tuple(ps1) => extend_with_matching_product( + ps1, start, alternatives, + |k, ps1, idx| matches!(k, Tuple(ps2) if eq_pre_post(ps1, ps2, idx)), + |k| always_pat!(k, Tuple(ps) => ps), + ), + // Transform `S(pre, x, post) | ... | S(pre, y, post)` into `S(pre, x | y, post]`. + TupleStruct(path1, ps1) => extend_with_matching_product( + ps1, start, alternatives, + |k, ps1, idx| matches!( + k, + TupleStruct(path2, ps2) if eq_path(path1, path2) && eq_pre_post(ps1, ps2, idx) + ), + |k| always_pat!(k, TupleStruct(_, ps) => ps), + ), + // Transform a record pattern `S { fp_0, ..., fp_n }`. + Struct(path1, fps1, rest1) => extend_with_struct_pat(path1, fps1, *rest1, start, alternatives), + }; + + alternatives[focus_idx].kind = focus_kind; + changed +} + +/// Here we focusing on a record pattern `S { fp_0, ..., fp_n }`. +/// In particular, for a record pattern, the order in which the field patterns is irrelevant. +/// So when we fixate on some `ident_k: pat_k`, we try to find `ident_k` in the other pattern +/// and check that all `fp_i` where `i ∈ ((0...n) \ k)` between two patterns are equal. +fn extend_with_struct_pat( + path1: &ast::Path, + fps1: &mut Vec, + rest1: bool, + start: usize, + alternatives: &mut Vec>, +) -> bool { + (0..fps1.len()).any(|idx| { + let pos_in_2 = Cell::new(None); // The element `k`. + let tail_or = drain_matching( + start, + alternatives, + |k| { + matches!(k, Struct(path2, fps2, rest2) + if rest1 == *rest2 // If one struct pattern has `..` so must the other. + && eq_path(path1, path2) + && fps1.len() == fps2.len() + && fps1.iter().enumerate().all(|(idx_1, fp1)| { + if idx_1 == idx { + // In the case of `k`, we merely require identical field names + // so that we will transform into `ident_k: p1_k | p2_k`. + let pos = fps2.iter().position(|fp2| eq_id(fp1.ident, fp2.ident)); + pos_in_2.set(pos); + pos.is_some() + } else { + fps2.iter().any(|fp2| eq_field_pat(fp1, fp2)) + } + })) + }, + // Extract `p2_k`. + |k| always_pat!(k, Struct(_, mut fps, _) => fps.swap_remove(pos_in_2.take().unwrap()).pat), + ); + extend_with_tail_or(&mut fps1[idx].pat, tail_or) + }) +} + +/// Like `extend_with_matching` but for products with > 1 factor, e.g., `C(p_0, ..., p_n)`. +/// Here, the idea is that we fixate on some `p_k` in `C`, +/// allowing it to vary between two `targets` and `ps2` (returned by `extract`), +/// while also requiring `ps1[..n] ~ ps2[..n]` (pre) and `ps1[n + 1..] ~ ps2[n + 1..]` (post), +/// where `~` denotes semantic equality. +fn extend_with_matching_product( + targets: &mut Vec>, + start: usize, + alternatives: &mut Vec>, + predicate: impl Fn(&PatKind, &[P], usize) -> bool, + extract: impl Fn(PatKind) -> Vec>, +) -> bool { + (0..targets.len()).any(|idx| { + let tail_or = drain_matching( + start, + alternatives, + |k| predicate(k, targets, idx), + |k| extract(k).swap_remove(idx), + ); + extend_with_tail_or(&mut targets[idx], tail_or) + }) +} + +/// Extract the pattern from the given one and replace it with `Wild`. +/// This is meant for temporarily swapping out the pattern for manipulation. +fn take_pat(from: &mut Pat) -> Pat { + let dummy = Pat { + id: DUMMY_NODE_ID, + kind: Wild, + span: DUMMY_SP, + }; + mem::replace(from, dummy) +} + +/// Extend `target` as an or-pattern with the alternatives +/// in `tail_or` if there are any and return if there were. +fn extend_with_tail_or(target: &mut Pat, tail_or: Vec>) -> bool { + fn extend(target: &mut Pat, mut tail_or: Vec>) { + match target { + // On an existing or-pattern in the target, append to it. + Pat { kind: Or(ps), .. } => ps.append(&mut tail_or), + // Otherwise convert the target to an or-pattern. + target => { + let mut init_or = vec![P(take_pat(target))]; + init_or.append(&mut tail_or); + target.kind = Or(init_or); + }, + } + } + + let changed = !tail_or.is_empty(); + if changed { + // Extend the target. + extend(target, tail_or); + } + changed +} + +// Extract all inner patterns in `alternatives` matching our `predicate`. +// Only elements beginning with `start` are considered for extraction. +fn drain_matching( + start: usize, + alternatives: &mut Vec>, + predicate: impl Fn(&PatKind) -> bool, + extract: impl Fn(PatKind) -> P, +) -> Vec> { + let mut tail_or = vec![]; + let mut idx = 0; + for pat in alternatives.drain_filter(|p| { + // Check if we should extract, but only if `idx >= start`. + idx += 1; + idx > start && predicate(&p.kind) + }) { + tail_or.push(extract(pat.into_inner().kind)); + } + tail_or +} + +fn extend_with_matching( + target: &mut Pat, + start: usize, + alternatives: &mut Vec>, + predicate: impl Fn(&PatKind) -> bool, + extract: impl Fn(PatKind) -> P, +) -> bool { + extend_with_tail_or(target, drain_matching(start, alternatives, predicate, extract)) +} + +/// Are the patterns in `ps1` and `ps2` equal save for `ps1[idx]` compared to `ps2[idx]`? +fn eq_pre_post(ps1: &[P], ps2: &[P], idx: usize) -> bool { + ps1[idx].is_rest() == ps2[idx].is_rest() // Avoid `[x, ..] | [x, 0]` => `[x, .. | 0]`. + && ps1.len() == ps2.len() + && over(&ps1[..idx], &ps2[..idx], |l, r| eq_pat(l, r)) + && over(&ps1[idx + 1..], &ps2[idx + 1..], |l, r| eq_pat(l, r)) +} diff --git a/clippy_lints/src/utils/ast_utils.rs b/clippy_lints/src/utils/ast_utils.rs new file mode 100755 index 000000000..69a7b6c05 --- /dev/null +++ b/clippy_lints/src/utils/ast_utils.rs @@ -0,0 +1,525 @@ +//! Utilities for manipulating and extracting information from `rustc_ast::ast`. +//! +//! - The `eq_foobar` functions test for semantic equality but ignores `NodeId`s and `Span`s. + +#![allow(clippy::similar_names, clippy::wildcard_imports, clippy::enum_glob_use)] + +use crate::utils::{both, over}; +use rustc_ast::ast::{self, *}; +use rustc_ast::ptr::P; +use std::mem; + +/// Checks if each element in the first slice is contained within the latter as per `eq_fn`. +pub fn unordered_over(left: &[X], right: &[X], mut eq_fn: impl FnMut(&X, &X) -> bool) -> bool { + left.len() == right.len() && left.iter().all(|l| right.iter().any(|r| eq_fn(l, r))) +} + +pub fn eq_id(l: Ident, r: Ident) -> bool { + l.name == r.name +} + +pub fn eq_pat(l: &Pat, r: &Pat) -> bool { + use PatKind::*; + match (&l.kind, &r.kind) { + (Paren(l), _) => eq_pat(l, r), + (_, Paren(r)) => eq_pat(l, r), + (Wild, Wild) | (Rest, Rest) => true, + (Lit(l), Lit(r)) => eq_expr(l, r), + (Ident(b1, i1, s1), Ident(b2, i2, s2)) => b1 == b2 && eq_id(*i1, *i2) && both(s1, s2, |l, r| eq_pat(l, r)), + (Range(lf, lt, le), Range(rf, rt, re)) => { + eq_expr_opt(lf, rf) && eq_expr_opt(lt, rt) && eq_range_end(&le.node, &re.node) + }, + (Box(l), Box(r)) + | (Ref(l, Mutability::Not), Ref(r, Mutability::Not)) + | (Ref(l, Mutability::Mut), Ref(r, Mutability::Mut)) => eq_pat(l, r), + (Tuple(l), Tuple(r)) | (Slice(l), Slice(r)) => over(l, r, |l, r| eq_pat(l, r)), + (Path(lq, lp), Path(rq, rp)) => both(lq, rq, |l, r| eq_qself(l, r)) && eq_path(lp, rp), + (TupleStruct(lp, lfs), TupleStruct(rp, rfs)) => eq_path(lp, rp) && over(lfs, rfs, |l, r| eq_pat(l, r)), + (Struct(lp, lfs, lr), Struct(rp, rfs, rr)) => { + lr == rr && eq_path(lp, rp) && unordered_over(lfs, rfs, |lf, rf| eq_field_pat(lf, rf)) + }, + (Or(ls), Or(rs)) => unordered_over(ls, rs, |l, r| eq_pat(l, r)), + (MacCall(l), MacCall(r)) => eq_mac_call(l, r), + _ => false, + } +} + +pub fn eq_range_end(l: &RangeEnd, r: &RangeEnd) -> bool { + match (l, r) { + (RangeEnd::Excluded, RangeEnd::Excluded) => true, + (RangeEnd::Included(l), RangeEnd::Included(r)) => { + matches!(l, RangeSyntax::DotDotEq) == matches!(r, RangeSyntax::DotDotEq) + }, + _ => false, + } +} + +pub fn eq_field_pat(l: &FieldPat, r: &FieldPat) -> bool { + l.is_placeholder == r.is_placeholder + && eq_id(l.ident, r.ident) + && eq_pat(&l.pat, &r.pat) + && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r)) +} + +pub fn eq_qself(l: &QSelf, r: &QSelf) -> bool { + l.position == r.position && eq_ty(&l.ty, &r.ty) +} + +pub fn eq_path(l: &Path, r: &Path) -> bool { + over(&l.segments, &r.segments, |l, r| eq_path_seg(l, r)) +} + +pub fn eq_path_seg(l: &PathSegment, r: &PathSegment) -> bool { + eq_id(l.ident, r.ident) && both(&l.args, &r.args, |l, r| eq_generic_args(l, r)) +} + +pub fn eq_generic_args(l: &GenericArgs, r: &GenericArgs) -> bool { + match (l, r) { + (GenericArgs::AngleBracketed(l), GenericArgs::AngleBracketed(r)) => { + over(&l.args, &r.args, |l, r| eq_angle_arg(l, r)) + }, + (GenericArgs::Parenthesized(l), GenericArgs::Parenthesized(r)) => { + over(&l.inputs, &r.inputs, |l, r| eq_ty(l, r)) && eq_fn_ret_ty(&l.output, &r.output) + }, + _ => false, + } +} + +pub fn eq_angle_arg(l: &AngleBracketedArg, r: &AngleBracketedArg) -> bool { + match (l, r) { + (AngleBracketedArg::Arg(l), AngleBracketedArg::Arg(r)) => eq_generic_arg(l, r), + (AngleBracketedArg::Constraint(l), AngleBracketedArg::Constraint(r)) => eq_assoc_constraint(l, r), + _ => false, + } +} + +pub fn eq_generic_arg(l: &GenericArg, r: &GenericArg) -> bool { + match (l, r) { + (GenericArg::Lifetime(l), GenericArg::Lifetime(r)) => eq_id(l.ident, r.ident), + (GenericArg::Type(l), GenericArg::Type(r)) => eq_ty(l, r), + (GenericArg::Const(l), GenericArg::Const(r)) => eq_expr(&l.value, &r.value), + _ => false, + } +} + +pub fn eq_expr_opt(l: &Option>, r: &Option>) -> bool { + both(l, r, |l, r| eq_expr(l, r)) +} + +pub fn eq_expr(l: &Expr, r: &Expr) -> bool { + use ExprKind::*; + if !over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r)) { + return false; + } + match (&l.kind, &r.kind) { + (Paren(l), _) => eq_expr(l, r), + (_, Paren(r)) => eq_expr(l, r), + (Err, Err) => true, + (Box(l), Box(r)) | (Try(l), Try(r)) | (Await(l), Await(r)) => eq_expr(l, r), + (Array(l), Array(r)) | (Tup(l), Tup(r)) => over(l, r, |l, r| eq_expr(l, r)), + (Repeat(le, ls), Repeat(re, rs)) => eq_expr(le, re) && eq_expr(&ls.value, &rs.value), + (Call(lc, la), Call(rc, ra)) => eq_expr(lc, rc) && over(la, ra, |l, r| eq_expr(l, r)), + (MethodCall(lc, la), MethodCall(rc, ra)) => eq_path_seg(lc, rc) && over(la, ra, |l, r| eq_expr(l, r)), + (Binary(lo, ll, lr), Binary(ro, rl, rr)) => lo.node == ro.node && eq_expr(ll, rl) && eq_expr(lr, rr), + (Unary(lo, l), Unary(ro, r)) => mem::discriminant(lo) == mem::discriminant(ro) && eq_expr(l, r), + (Lit(l), Lit(r)) => l.kind == r.kind, + (Cast(l, lt), Cast(r, rt)) | (Type(l, lt), Type(r, rt)) => eq_expr(l, r) && eq_ty(lt, rt), + (Let(lp, le), Let(rp, re)) => eq_pat(lp, rp) && eq_expr(le, re), + (If(lc, lt, le), If(rc, rt, re)) => eq_expr(lc, rc) && eq_block(lt, rt) && eq_expr_opt(le, re), + (While(lc, lt, ll), While(rc, rt, rl)) => eq_label(ll, rl) && eq_expr(lc, rc) && eq_block(lt, rt), + (ForLoop(lp, li, lt, ll), ForLoop(rp, ri, rt, rl)) => { + eq_label(ll, rl) && eq_pat(lp, rp) && eq_expr(li, ri) && eq_block(lt, rt) + }, + (Loop(lt, ll), Loop(rt, rl)) => eq_label(ll, rl) && eq_block(lt, rt), + (Block(lb, ll), Block(rb, rl)) => eq_label(ll, rl) && eq_block(lb, rb), + (TryBlock(l), TryBlock(r)) => eq_block(l, r), + (Yield(l), Yield(r)) | (Ret(l), Ret(r)) => eq_expr_opt(l, r), + (Break(ll, le), Break(rl, re)) => eq_label(ll, rl) && eq_expr_opt(le, re), + (Continue(ll), Continue(rl)) => eq_label(ll, rl), + (Assign(l1, l2, _), Assign(r1, r2, _)) | (Index(l1, l2), Index(r1, r2)) => eq_expr(l1, r1) && eq_expr(l2, r2), + (AssignOp(lo, lp, lv), AssignOp(ro, rp, rv)) => lo.node == ro.node && eq_expr(lp, rp) && eq_expr(lv, rv), + (Field(lp, lf), Field(rp, rf)) => eq_id(*lf, *rf) && eq_expr(lp, rp), + (Match(ls, la), Match(rs, ra)) => eq_expr(ls, rs) && over(la, ra, |l, r| eq_arm(l, r)), + (Closure(lc, la, lm, lf, lb, _), Closure(rc, ra, rm, rf, rb, _)) => { + lc == rc && la.is_async() == ra.is_async() && lm == rm && eq_fn_decl(lf, rf) && eq_expr(lb, rb) + }, + (Async(lc, _, lb), Async(rc, _, rb)) => lc == rc && eq_block(lb, rb), + (Range(lf, lt, ll), Range(rf, rt, rl)) => ll == rl && eq_expr_opt(lf, rf) && eq_expr_opt(lt, rt), + (AddrOf(lbk, lm, le), AddrOf(rbk, rm, re)) => lbk == rbk && lm == rm && eq_expr(le, re), + (Path(lq, lp), Path(rq, rp)) => both(lq, rq, |l, r| eq_qself(l, r)) && eq_path(lp, rp), + (MacCall(l), MacCall(r)) => eq_mac_call(l, r), + (Struct(lp, lfs, lb), Struct(rp, rfs, rb)) => { + eq_path(lp, rp) && eq_expr_opt(lb, rb) && unordered_over(lfs, rfs, |l, r| eq_field(l, r)) + }, + _ => false, + } +} + +pub fn eq_field(l: &Field, r: &Field) -> bool { + l.is_placeholder == r.is_placeholder + && eq_id(l.ident, r.ident) + && eq_expr(&l.expr, &r.expr) + && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r)) +} + +pub fn eq_arm(l: &Arm, r: &Arm) -> bool { + l.is_placeholder == r.is_placeholder + && eq_pat(&l.pat, &r.pat) + && eq_expr(&l.body, &r.body) + && eq_expr_opt(&l.guard, &r.guard) + && over(&l.attrs, &r.attrs, |l, r| eq_attr(l, r)) +} + +pub fn eq_label(l: &Option

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