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Merge commit 'e214ea82ad0a751563acf67e1cd9279cf302db3a' into clippyup

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flip1995 2020-05-17 17:36:26 +02:00
parent 8bba1b7589
commit f1d3086492
74 changed files with 1784 additions and 1116 deletions
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44
CHANGELOG.md
View file

@ -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)
@ -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)
@ -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)*
@ -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`]
@ -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`.
@ -1273,9 +1273,9 @@ 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
[`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
[`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
@ -1338,6 +1338,7 @@ 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
@ -1361,14 +1362,12 @@ 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_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
[`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
@ -1431,6 +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_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
@ -1494,16 +1494,11 @@ 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_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
[`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
@ -1540,12 +1535,9 @@ 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_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
@ -1625,11 +1617,13 @@ 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
[`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

55
clippy_lints/src/block_in_if_condition.rs → clippy_lints/src/blocks_in_if_conditions.rs
View file

@ -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 BLOCKS_IN_IF_CONDITIONS,
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!(BlocksInIfConditions => [BLOCKS_IN_IF_CONDITIONS]);
struct ExVisitor<'a, 'tcx> {
found_block: Option<&'tcx Expr<'tcx>>,
@ -72,9 +69,9 @@ 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 {
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;
@ -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,
BLOCKS_IN_IF_CONDITIONS,
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,
BLOCKS_IN_IF_CONDITIONS,
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, BLOCKS_IN_IF_CONDITIONS, block.span, COMPLEX_BLOCK_MESSAGE);
}
}
}

2
clippy_lints/src/bytecount.rs
View file

@ -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};

17
clippy_lints/src/comparison_chain.rs
View file

@ -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, &[]));

2
clippy_lints/src/eq_op.rs
View file

@ -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)],
);
},

22
clippy_lints/src/identity_op.rs
View file

@ -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) {

2
clippy_lints/src/let_if_seq.rs
View file

@ -50,7 +50,7 @@ declare_clippy_lint! {
/// };
/// ```
pub USELESS_LET_IF_SEQ,
style,
nursery,
"unidiomatic `let mut` declaration followed by initialization in `if`"
}

84
clippy_lints/src/lib.rs
View file

@ -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;
@ -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;
@ -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,
&blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS,
&booleans::LOGIC_BUG,
&booleans::NONMINIMAL_BOOL,
&bytecount::NAIVE_BYTECOUNT,
@ -578,7 +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,
@ -616,15 +614,13 @@ 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_LOOPS_OVER_FALLIBLES,
&loops::ITER_NEXT_LOOP,
&loops::MANUAL_MEMCPY,
&loops::MUT_RANGE_BOUND,
&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,
@ -653,12 +649,14 @@ 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,
&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,
@ -675,20 +673,13 @@ 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_OR,
&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,
&methods::SINGLE_CHAR_PATTERN,
@ -699,6 +690,7 @@ 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,
@ -770,6 +762,7 @@ 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,
@ -849,6 +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,
@ -900,7 +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);
@ -986,7 +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);
@ -1090,12 +1084,10 @@ 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::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),
@ -1153,9 +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::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_OR),
LintId::of(&misc::USED_UNDERSCORE_BINDING),
LintId::of(&misc_early::UNSEPARATED_LITERAL_SUFFIX),
LintId::of(&mut_mut::MUT_MUT),
@ -1209,8 +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_EXPR),
LintId::of(&block_in_if_condition::BLOCK_IN_IF_CONDITION_STMT),
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),
@ -1252,7 +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),
@ -1266,7 +1254,6 @@ 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),
@ -1275,15 +1262,13 @@ 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_LOOPS_OVER_FALLIBLES),
LintId::of(&loops::ITER_NEXT_LOOP),
LintId::of(&loops::MANUAL_MEMCPY),
LintId::of(&loops::MUT_RANGE_BOUND),
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),
@ -1305,6 +1290,7 @@ 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),
@ -1321,7 +1307,6 @@ 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),
@ -1384,6 +1369,7 @@ 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),
@ -1440,6 +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),
@ -1456,8 +1443,7 @@ 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(&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),
@ -1476,7 +1462,6 @@ 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),
@ -1561,7 +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),
@ -1574,10 +1558,10 @@ 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),
@ -1620,6 +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),
]);
@ -1652,11 +1637,9 @@ 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_LOOPS_OVER_FALLIBLES),
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),
@ -1675,6 +1658,7 @@ 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(&regex::INVALID_REGEX),
LintId::of(&serde_api::SERDE_API_MISUSE),
LintId::of(&suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
@ -1728,6 +1712,7 @@ 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),
@ -1785,6 +1770,10 @@ 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.
@ -1795,6 +1784,19 @@ 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");
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_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.

184
clippy_lints/src/loops.rs
View file

@ -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};
@ -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<i32, std::io::Error> = Ok(1);
///
/// // Bad
/// for x in &res {
/// // ..
/// }
///
/// // Good
/// if let Ok(x) = res {
/// // ..
/// }
/// ```
pub FOR_LOOP_OVER_OPTION,
pub FOR_LOOPS_OVER_FALLIBLES,
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! {
@ -270,30 +261,6 @@ 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()`.
@ -459,11 +426,9 @@ declare_lint_pass!(Loops => [
EXPLICIT_ITER_LOOP,
EXPLICIT_INTO_ITER_LOOP,
ITER_NEXT_LOOP,
FOR_LOOP_OVER_RESULT,
FOR_LOOP_OVER_OPTION,
FOR_LOOPS_OVER_FALLIBLES,
WHILE_LET_LOOP,
NEEDLESS_COLLECT,
REVERSE_RANGE_LOOP,
EXPLICIT_COUNTER_LOOP,
EMPTY_LOOP,
WHILE_LET_ON_ITERATOR,
@ -761,7 +726,6 @@ 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);
@ -1170,7 +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!("({}, <item>)", ident.name)),
(
@ -1199,7 +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, "<item>".to_string()), (arg.span, repl)],
);
},
@ -1248,78 +1212,6 @@ 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);
@ -1381,7 +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;
}
@ -1398,11 +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_LOOPS_OVER_FALLIBLES,
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,
@ -1415,11 +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_LOOPS_OVER_FALLIBLES,
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,
@ -1570,7 +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)),

2
clippy_lints/src/map_clone.rs
View file

@ -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

2
clippy_lints/src/matches.rs
View file

@ -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);
}
});
}

309
clippy_lints/src/methods/bind_instead_of_map.rs Normal file
View file

@ -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<Self::Map> {
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<F> {
in_stmt: bool,
failed: bool,
cb: F,
}
struct WithStmtGuarg<'a, F> {
val: &'a mut RetFinder<F>,
prev_in_stmt: bool,
}
impl<F> RetFinder<F> {
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<F> std::ops::Deref for WithStmtGuarg<'_, F> {
type Target = RetFinder<F>;
fn deref(&self) -> &Self::Target {
self.val
}
}
impl<F> std::ops::DerefMut for WithStmtGuarg<'_, F> {
fn deref_mut(&mut self) -> &mut Self::Target {
self.val
}
}
impl<F> 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<F> {
type Map = Map<'hir>;
fn nested_visit_map(&mut self) -> intravisit::NestedVisitorMap<Self::Map> {
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
}
}

331
clippy_lints/src/methods/mod.rs
View file

@ -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;
@ -33,40 +35,15 @@ 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
@ -75,81 +52,73 @@ declare_clippy_lint! {
///
/// **Known problems:** None.
///
/// **Example:**
/// Using unwrap on an `Result`:
///
/// **Examples:**
/// ```rust
/// let res: Result<usize, ()> = Ok(1);
/// res.unwrap();
/// # let opt = Some(1);
///
/// // Bad
/// opt.unwrap();
///
/// // Good
/// opt.expect("more helpful message");
/// ```
///
/// Better:
/// // or
///
/// ```rust
/// let res: Result<usize, ()> = Ok(1);
/// # let res: Result<usize, ()> = 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! {
/// **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<usize, ()> = Ok(1);
/// res.expect("one");
/// // Bad
/// opt.expect("one");
///
/// // Good
/// let opt = Some(1);
/// opt?;
/// ```
///
/// Better:
/// // or
///
/// ```rust
/// let res: Result<usize, ()> = Ok(1);
/// # let res: Result<usize, ()> = 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! {
@ -257,59 +226,40 @@ 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<usize, ()> = 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_OR,
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! {
@ -358,27 +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)`"
}
@ -1286,20 +1243,16 @@ declare_clippy_lint! {
}
declare_lint_pass!(Methods => [
OPTION_UNWRAP_USED,
RESULT_UNWRAP_USED,
OPTION_EXPECT_USED,
RESULT_EXPECT_USED,
UNWRAP_USED,
EXPECT_USED,
SHOULD_IMPLEMENT_TRAIT,
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_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,
@ -1358,7 +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]),
@ -1503,9 +1462,7 @@ 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 +1635,7 @@ 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 +1888,7 @@ 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 +2078,7 @@ 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,
@ -2420,9 +2377,9 @@ 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
};
@ -2436,7 +2393,7 @@ 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,
),
);
@ -2448,9 +2405,9 @@ 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
};
@ -2494,7 +2451,7 @@ 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 +2512,10 @@ 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 +2527,7 @@ 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_OR,
expr.span,
msg,
None,
@ -2584,16 +2537,7 @@ 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_OR, expr.span, msg);
};
}
}
@ -2672,73 +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>,

6
clippy_lints/src/methods/option_map_unwrap_or.rs
View file

@ -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_OR;
/// 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_OR, expr.span, msg, |diag| {
let map_arg_span = map_args[1].span;
let mut suggestion = vec![

2
clippy_lints/src/needless_pass_by_value.rs
View file

@ -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(

112
clippy_lints/src/ranges.rs
View file

@ -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,no_run
/// 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(

64
clippy_lints/src/returns.rs
View file

@ -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,
);
}

4
clippy_lints/src/types.rs
View file

@ -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,
@ -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);
}
}

12
clippy_lints/src/unwrap.rs
View file

@ -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<UnwrapInfo<'tcx>> {
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() {

30
clippy_lints/src/identity_conversion.rs → clippy_lints/src/useless_conversion.rs
View file

@ -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<HirId>,
}
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, "<expr>").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

28
clippy_lints/src/utils/diagnostics.rs
View file

@ -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<I>(diag: &mut DiagnosticBuilder<'_>, help_msg: String, sugg: I)
pub fn multispan_sugg<I>(diag: &mut DiagnosticBuilder<'_>, help_msg: &str, sugg: I)
where
I: IntoIterator<Item = (Span, String)>,
{
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<I>(
diag: &mut DiagnosticBuilder<'_>,
help_msg: &str,
applicability: Applicability,
sugg: I,
) where
I: IntoIterator<Item = (Span, String)>,
{
diag.multipart_suggestion(help_msg, sugg.into_iter().collect(), applicability);
}

4
clippy_lints/src/utils/usage.rs
View file

@ -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 {

228
src/driver.rs
View file

@ -295,121 +295,119 @@ fn toolchain_path(home: Option<String>, toolchain: Option<String>) -> Option<Pat
pub fn main() {
rustc_driver::init_rustc_env_logger();
lazy_static::initialize(&ICE_HOOK);
exit(
rustc_driver::catch_with_exit_code(move || {
let mut orig_args: Vec<String> = env::args().collect();
exit(rustc_driver::catch_with_exit_code(move || {
let mut orig_args: Vec<String> = 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<String> = 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<String> = 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)
}))
}

130
src/lintlist/mod.rs
View file

@ -66,6 +66,13 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -74,18 +81,11 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
module: "blacklisted_name",
},
Lint {
name: "block_in_if_condition_expr",
name: "blocks_in_if_conditions",
group: "style",
desc: "braces that can be eliminated in conditions, e.g., `if { true } ...`",
desc: "useless or complex blocks that can be eliminated in conditions",
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 } ...`",
deprecation: None,
module: "block_in_if_condition",
module: "blocks_in_if_conditions",
},
Lint {
name: "bool_comparison",
@ -521,6 +521,13 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -676,16 +683,9 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
module: "loops",
},
Lint {
name: "for_loop_over_option",
name: "for_loops_over_fallibles",
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",
},
@ -724,13 +724,6 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -1144,6 +1137,13 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
deprecation: None,
module: "methods",
},
Lint {
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,
module: "methods",
},
Lint {
name: "match_as_ref",
group: "complexity",
@ -1578,13 +1578,6 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -1599,13 +1592,6 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -1620,20 +1606,6 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -1641,13 +1613,6 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -1886,13 +1851,6 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -1908,25 +1866,11 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
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",
desc: "using `Result.unwrap()`, which might be better handled",
deprecation: None,
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",
@ -2425,6 +2369,13 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -2460,6 +2411,13 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",
@ -2469,7 +2427,7 @@ pub static ref ALL_LINTS: Vec<Lint> = 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",

4
tests/ui/option_and_then_some.fixed → tests/ui/bind_instead_of_map.fixed
View file

@ -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<u32, &str> = Ok(1);
let _ = x.and_then(Ok);
let _ = x;
}
pub fn foo() -> Option<String> {

2
tests/ui/option_and_then_some.rs → tests/ui/bind_instead_of_map.rs
View file

@ -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() {

18
tests/ui/option_and_then_some.stderr → tests/ui/bind_instead_of_map.stderr
View file

@ -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

61
tests/ui/bind_instead_of_map_multipart.rs Normal file
View file

@ -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)) });
}

73
tests/ui/bind_instead_of_map_multipart.stderr Normal file
View file

@ -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

7
tests/ui/block_in_if_condition.fixed → tests/ui/blocks_in_if_conditions.fixed
View file

@ -1,6 +1,5 @@
// run-rustfix
#![warn(clippy::block_in_if_condition_expr)]
#![warn(clippy::block_in_if_condition_stmt)]
#![warn(clippy::blocks_in_if_conditions)]
#![allow(unused, clippy::let_and_return)]
#![warn(clippy::nonminimal_bool)]
@ -64,10 +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());
}

7
tests/ui/block_in_if_condition.rs → tests/ui/blocks_in_if_conditions.rs
View file

@ -1,6 +1,5 @@
// run-rustfix
#![warn(clippy::block_in_if_condition_expr)]
#![warn(clippy::block_in_if_condition_stmt)]
#![warn(clippy::blocks_in_if_conditions)]
#![allow(unused, clippy::let_and_return)]
#![warn(clippy::nonminimal_bool)]
@ -64,10 +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());
}

10
tests/ui/block_in_if_condition.stderr → tests/ui/blocks_in_if_conditions.stderr
View file

@ -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/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-stmt` implied by `-D warnings`
= note: `-D clippy::blocks-in-if-conditions` 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/blocks_in_if_conditions.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/blocks_in_if_conditions.rs:46:8
|
LL | if true && x == 3 {
| ^^^^^^^^^^^^^^ help: try: `x == 3`

5
tests/ui/block_in_if_condition_closure.rs → tests/ui/blocks_in_if_conditions_closure.rs
View file

@ -1,5 +1,4 @@
#![warn(clippy::block_in_if_condition_expr)]
#![warn(clippy::block_in_if_condition_stmt)]
#![warn(clippy::blocks_in_if_conditions)]
#![allow(unused, clippy::let_and_return)]
fn predicate<F: FnOnce(T) -> 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

6
tests/ui/block_in_if_condition_closure.stderr → tests/ui/blocks_in_if_conditions_closure.stderr
View file

@ -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/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-stmt` 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:28:13
--> $DIR/blocks_in_if_conditions_closure.rs:27:13
|
LL | |x| {
| _____________^

66
tests/ui/comparison_chain.rs
View file

@ -137,4 +137,70 @@ fn h<T: Ord>(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() {}

17
tests/ui/crashes/ice-5579.rs Normal file
View file

@ -0,0 +1,17 @@
trait IsErr {
fn is_err(&self, err: &str) -> bool;
}
impl<T> IsErr for Option<T> {
fn is_err(&self, _err: &str) -> bool {
true
}
}
fn main() {
let t = Some(1);
if t.is_err("") {
t.unwrap();
}
}

2
tests/ui/expect.rs
View file

@ -1,4 +1,4 @@
#![warn(clippy::option_expect_used, clippy::result_expect_used)]
#![warn(clippy::expect_used)]
fn expect_option() {
let opt = Some(0);

3
tests/ui/expect.stderr
View file

@ -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

54
tests/ui/for_loop_fixable.fixed
View file

@ -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

54
tests/ui/for_loop_fixable.rs
View file

@ -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

88
tests/ui/for_loop_fixable.stderr
View file

@ -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

18
tests/ui/for_loop_unfixable.rs
View file

@ -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");
}
}
}

11
tests/ui/for_loop_unfixable.stderr
View file

@ -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`.

10
tests/ui/for_loop_over_option_result.rs → tests/ui/for_loops_over_fallibles.rs
View file

@ -1,18 +1,16 @@
#![warn(clippy::for_loop_over_option, clippy::for_loop_over_result)]
#![warn(clippy::for_loops_over_fallibles)]
/// Tests for_loop_over_result and for_loop_over_option
fn for_loop_over_option_and_result() {
fn for_loops_over_fallibles() {
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);
}

19
tests/ui/for_loop_over_option_result.stderr → tests/ui/for_loops_over_fallibles.stderr
View file

@ -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_loops_over_fallibles.rs:9:14
|
LL | for x in option {
| ^^^^^^
|
= note: `-D clippy::for-loop-over-option` 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_option_result.rs:16:14
--> $DIR/for_loops_over_fallibles.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_loops_over_fallibles.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_loops_over_fallibles.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_loops_over_fallibles.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_loops_over_fallibles.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_loops_over_fallibles.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_loops_over_fallibles.rs:51:5
|
LL | / while let Ok(x) = result {
LL | | println!("{}", x);

5
tests/ui/identity_op.rs
View file

@ -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;
}

20
tests/ui/identity_op.stderr
View file

@ -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

4
tests/ui/implicit_saturating_sub.fixed
View file

@ -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;

4
tests/ui/implicit_saturating_sub.rs
View file

@ -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;

2
tests/ui/manual_memcpy.rs
View file

@ -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];
}

23
tests/ui/option_map_unwrap_or.rs → tests/ui/map_unwrap_or.rs
View file

@ -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_or)]
#[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<i32, ()> = 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();
}

49
tests/ui/option_map_unwrap_or.stderr → tests/ui/map_unwrap_or.stderr
View file

@ -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_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::option-map-unwrap-or` 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/option_map_unwrap_or.rs:24:13
--> $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/option_map_unwrap_or.rs:28:13
--> $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/option_map_unwrap_or.rs:33:13
--> $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/option_map_unwrap_or.rs:35:13
--> $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/option_map_unwrap_or.rs:39:13
--> $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/option_map_unwrap_or.rs:50:13
--> $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/option_map_unwrap_or.rs:54:13
--> $DIR/map_unwrap_or.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_or.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_or.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_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
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= 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_or.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_or.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

2
tests/ui/option_map_or_none.fixed
View file

@ -1,6 +1,6 @@
// run-rustfix
#![allow(clippy::option_and_then_some)]
#![allow(clippy::bind_instead_of_map)]
fn main() {
let opt = Some(1);

2
tests/ui/option_map_or_none.rs
View file

@ -1,6 +1,6 @@
// run-rustfix
#![allow(clippy::option_and_then_some)]
#![allow(clippy::bind_instead_of_map)]
fn main() {
let opt = Some(1);

23
tests/ui/result_map_unwrap_or_else.rs
View file

@ -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<i32, ()> = 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() {}

27
tests/ui/result_map_unwrap_or_else.stderr
View file

@ -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

24
tests/ui/reversed_empty_ranges_fixable.fixed Normal file
View file

@ -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::<Vec<_>>();
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 {}
}

24
tests/ui/reversed_empty_ranges_fixable.rs Normal file
View file

@ -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::<Vec<_>>();
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 {}
}

47
tests/ui/reversed_empty_ranges_fixable.stderr Normal file
View file

@ -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::<Vec<_>>();
| ^^^^^^^^^^^^
|
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::<Vec<_>>();
| ^^^^^^^^^^^^^^^^^^
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

57
tests/ui/reversed_empty_ranges_loops_fixable.fixed Normal file
View file

@ -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);
}
}

57
tests/ui/reversed_empty_ranges_loops_fixable.rs Normal file
View file

@ -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);
}
}

69
tests/ui/reversed_empty_ranges_loops_fixable.stderr Normal file
View file

@ -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

11
tests/ui/reversed_empty_ranges_loops_unfixable.rs Normal file
View file

@ -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);
}
}

16
tests/ui/reversed_empty_ranges_loops_unfixable.stderr Normal file
View file

@ -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

15
tests/ui/reversed_empty_ranges_unfixable.rs Normal file
View file

@ -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 {}
}

34
tests/ui/reversed_empty_ranges_unfixable.stderr Normal file
View file

@ -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

21
tests/ui/unused_unit.fixed
View file

@ -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<F: Fn() -> (), G>(&self, f: F, _g: G)
where G: Fn() -> () {
let _y: &dyn Fn() -> () = &f;
pub fn get_unit<F: Fn() , 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
}
}
@ -30,6 +29,20 @@ impl Into<()> for Unitter {
}
}
trait Trait {
fn redundant<F: FnOnce() , G, H>(&self, _f: F, _g: G, _h: H)
where
G: FnMut() ,
H: Fn() ;
}
impl Trait for Unitter {
fn redundant<F: FnOnce() , G, H>(&self, _f: F, _g: G, _h: H)
where
G: FnMut() ,
H: Fn() {}
}
fn return_unit() { }
#[allow(clippy::needless_return)]

18
tests/ui/unused_unit.rs
View file

@ -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<F: Fn() -> (), G>(&self, f: F, _g: G) ->
()
pub fn get_unit<F: Fn() -> (), 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<F: FnOnce() -> (), G, H>(&self, _f: F, _g: G, _h: H)
where
G: FnMut() -> (),
H: Fn() -> ();
}
impl Trait for Unitter {
fn redundant<F: FnOnce() -> (), G, H>(&self, _f: F, _g: G, _h: H)
where
G: FnMut() -> (),
H: Fn() -> () {}
}
fn return_unit() -> () { () }
#[allow(clippy::needless_return)]

76
tests/ui/unused_unit.stderr
View file

@ -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<F: Fn() -> (), G>(&self, f: F, _g: G) ->
| ___________________________________________________________^
LL | | ()
| |__________^ help: remove the `-> ()`
LL | pub fn get_unit<F: Fn() -> (), 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<F: Fn() -> (), 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<F: FnOnce() -> (), 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<F: FnOnce() -> (), 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

2
tests/ui/unwrap.rs
View file

@ -1,4 +1,4 @@
#![warn(clippy::option_unwrap_used, clippy::result_unwrap_used)]
#![warn(clippy::unwrap_used)]
fn unwrap_option() {
let opt = Some(0);

3
tests/ui/unwrap.stderr
View file

@ -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

4
tests/ui/identity_conversion.fixed → tests/ui/useless_conversion.fixed
View file

@ -1,6 +1,6 @@
// run-rustfix
#![deny(clippy::identity_conversion)]
#![deny(clippy::useless_conversion)]
fn test_generic<T: Copy>(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");

4
tests/ui/identity_conversion.rs → tests/ui/useless_conversion.rs
View file

@ -1,6 +1,6 @@
// run-rustfix
#![deny(clippy::identity_conversion)]
#![deny(clippy::useless_conversion)]
fn test_generic<T: Copy>(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");

46
tests/ui/identity_conversion.stderr → tests/ui/useless_conversion.stderr
View file

@ -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")`