[`unconditional_recursion`]: compare by `Ty`s instead of `DefId`s
Fixes#12154Fixes#12181 (this was later edited in, so the rest of the description refers to the first linked issue)
Before this change, the lint would work with `DefId`s and use those to compare types. This PR changes it to compare types directly. It fixes the linked issue, but also other false positives I found in a lintcheck run. For example, one of the issues is that some types don't have `DefId`s (primitives, references, etc., leading to possible FNs), and the helper function used to extract a `DefId` didn't handle type parameters.
Another issue was that the lint would use `.peel_refs()` in a few places where that could lead to false positives (one such FP was in the `http` crate). See the doc comment on one of the added functions and also the test case for what I mean.
The code in the linked issue was linted because the receiver type is `T` (a `ty::Param`), which was not handled in `get_ty_def_id` and returned `None`, so this wouldn't actually *get* to comparing `self_arg != ty_id` here, and skip the early-return:
70573af31e/clippy_lints/src/unconditional_recursion.rs (L171-L178)
This alone could be fixed by doing something like `&& get_ty_def_id(ty).map_or(true, |ty_id)| self_arg != ty_id)`, but we don't really need to work with `DefId`s in the first place, I don't think.
changelog: [`unconditional_recursion`]: avoid linting when the other comparison type is a type parameter
Fix false positive in `redundant_type_annotations` lint
This PR changes the `redundant_type_annotations` lint to allow slice type annotations (i.e., `&[u8]`) for byte string literals. It will still consider _array_ type annotations (i.e., `&[u8; 4]`) as redundant. The reasoning behind this is that the type of byte string literals is by default a reference to an array, but, by using a type annotation, you can force it to be a slice. For example:
```rust
let a: &[u8; 4] = b"test";
let b: &[u8] = b"test";
```
Now, the type annotation for `a` will still be linted (as it is still redundant), but the type annotation for `b` will not.
Fixes#12212.
changelog: [`redundant_type_annotations`]: Fix false positive with byte string literals
Return `Some` from `walk_to_expr_usage` more
fixes#11786
supersedes #11097
The code removed in the first commit would have needed changes due to the second commit. Since it's useless it just gets removed instead.
changelog: `needless_borrow`: Fix linting in tuple and array expressions.
[`redundant_locals`]: take by-value closure captures into account
Fixes#12225
The same problem in the linked issue can happen to regular closures too, and conveniently async blocks are closures in the HIR so fixing closures will fix async blocks as well.
changelog: [`redundant_locals`]: avoid linting when redefined variable is captured by-value
new lint: `manual_c_str_literals`
With rust-lang/rust#117472 merged and `c""` syntax stabilized, I think it'd be nice to have a lint for using `CStr::from_ptr` (and similar constructors) with a string literal as an argument.
We can probably also lint `"foo\0".as_ptr()` and suggest `c"foo".as_ptr()`. I might add that to this PR tomorrow if I find the time.
The byte string literal to c string literal rewriting is ugly but oh well.
changelog: new lint: `manual_c_str_literals`
[#11919](https://github.com/rust-lang/rust-clippy/pull/11919)
make matching on NaN a hard error, and remove the rest of illegal_floating_point_literal_pattern
These arms would never be hit anyway, so the pattern makes little sense. We have had a future-compat lint against float matches in general for a *long* time, so I hope we can get away with immediately making this a hard error.
This is part of implementing https://github.com/rust-lang/rfcs/pull/3535.
Closes https://github.com/rust-lang/rust/issues/41620 by removing the lint.
https://github.com/rust-lang/reference/pull/1456 updates the reference to match.
Add new lint: `ref_as_ptr`
Fixes#10130
Added new lint `ref_as_ptr` that checks for conversions from references to pointers and suggests using `std::ptr::from_{ref, mut}` instead.
The name is different than suggested in the issue (`as_ptr_cast`) since there were some other lints with similar names (`ptr_as_ptr`, `borrow_as_ptr`) and I wanted to follow the convention.
Note that this lint conflicts with the `borrow_as_ptr` lint in the sense that it recommends changing `&foo as *const _` to `std::ptr::from_ref(&foo)` instead of `std::ptr::addr_of!(foo)`. Personally, I think the former is more readable and, in contrast to `addr_of` macro, can be also applied to temporaries (cf. #9884).
---
changelog: New lint: [`ref_as_ptr`]
[#12087](https://github.com/rust-lang/rust-clippy/pull/12087)
add configuration for [`wildcard_imports`] to ignore certain imports
fixes: #11428
changelog: add configuration `ignored-wildcard-imports` for lint [`wildcard_imports`]
Fixed FP in `unused_io_amount` for Ok(lit), unrachable! and unwrap de…
…sugar
Fixes fp caused by linting on Ok(_) for all cases outside binding.
We introduce the following rules for match exprs.
- `panic!` and `unreachable!` are treated as consumed.
- `Ok( )` patterns outside `DotDot` and `Wild` are treated as consuming.
changelog: FP [`unused_io_amount`] when matching Ok(literal) or unreachable
fixes#12208
r? `@blyxyas`
We introduce the following rules for match exprs.
- `panic!` and `unreachable!` are treated as consumption.
- guard expressions in any arm imply consumption.
For match exprs:
- Lint only if exacrtly 2 non-consuming arms exist
- Lint only if one arm is an `Ok(_)` and the other is `Err(_)`
Added additional requirement that for a block return expression
that is a match, the source must be `Normal`.
changelog: FP [`unused_io_amount`] when matching Ok(literal)
Add `lint_groups_priority` lint
Warns when a lint group in Cargo.toml's `[lints]` section shares the same priority as a lint. This is in the cargo section but is categorised as `correctness` so it's on by default, it doesn't call `cargo metadata` though and parses the `Cargo.toml` directly
The lint should be temporary until https://github.com/rust-lang/cargo/issues/12918 is resolved, but in the meanwhile this is an common issue to run into
- #11237
- #11751
- #11830
changelog: Add [`lint_groups_priority`] lint
r? `@flip1995`
Don't hash lints differently to non-lints.
`Diagnostic::keys`, which is used for hashing and equating diagnostics, has a surprising behaviour: it ignores children, but only for lints. This was added in #88493 to fix some duplicated diagnostics, but it doesn't seem necessary any more.
This commit removes the special case and only four tests have changed output, with additional errors. And those additional errors aren't exact duplicates, they're just similar. For example, in src/tools/clippy/tests/ui/same_name_method.rs we currently have this error:
```
error: method's name is the same as an existing method in a trait
--> $DIR/same_name_method.rs:75:13
|
LL | fn foo() {}
| ^^^^^^^^^^^
|
note: existing `foo` defined here
--> $DIR/same_name_method.rs:79:9
|
LL | impl T1 for S {}
| ^^^^^^^^^^^^^^^^
```
and with this change we also get this error:
```
error: method's name is the same as an existing method in a trait
--> $DIR/same_name_method.rs:75:13
|
LL | fn foo() {}
| ^^^^^^^^^^^
|
note: existing `foo` defined here
--> $DIR/same_name_method.rs:81:9
|
LL | impl T2 for S {}
|
```
I think printing this second argument is reasonable, possibly even preferable to hiding it. And the other cases are similar.
r? `@estebank`
`Diagnostic::keys`, which is used for hashing and equating diagnostics,
has a surprising behaviour: it ignores children, but only for lints.
This was added in #88493 to fix some duplicated diagnostics, but it
doesn't seem necessary any more.
This commit removes the special case and only four tests have changed
output, with additional errors. And those additional errors aren't
exact duplicates, they're just similar. For example, in
src/tools/clippy/tests/ui/same_name_method.rs we currently have this
error:
```
error: method's name is the same as an existing method in a trait
--> $DIR/same_name_method.rs:75:13
|
LL | fn foo() {}
| ^^^^^^^^^^^
|
note: existing `foo` defined here
--> $DIR/same_name_method.rs:79:9
|
LL | impl T1 for S {}
| ^^^^^^^^^^^^^^^^
```
and with this change we also get this error:
```
error: method's name is the same as an existing method in a trait
--> $DIR/same_name_method.rs:75:13
|
LL | fn foo() {}
| ^^^^^^^^^^^
|
note: existing `foo` defined here
--> $DIR/same_name_method.rs:81:9
|
LL | impl T2 for S {}
| ^^^^^^^^^^^^^^^^
```
I think printing this second argument is reasonable, possibly even
preferable to hiding it. And the other cases are similar.
Remove various `has_errors` or `err_count` uses
follow up to https://github.com/rust-lang/rust/pull/119895
r? `@nnethercote` since you recently did something similar.
There are so many more of these, but I wanted to get a PR out instead of growing the commit list indefinitely. The commits all work on their own and can be reviewed commit by commit.
The query accept arbitrary DefIds, not just owner DefIds.
The return can be an `Option` because if there are no nodes, then it doesn't matter whether it's due to NonOwner or Phantom.
Also rename the query to `opt_hir_owner_nodes`.
Add regression ui test for #2371Fixes#2371.
#2371 seems to already be handled correctly in the lint. This PR adds a ui regression test so we can close it.
r? `@blyxyas`
changelog: Add regression ui test for #2371
[fix] [`redundant_closure_for_method_calls`] Suggest relative paths for local modules
Fixes#10854.
Currently, `redundant_closure_for_method_calls` suggest incorrect paths when a method defined on a struct within inline mod is referenced (see the description in the aforementioned issue for an example; also see [this playground link](https://play.rust-lang.org/?version=stable&mode=release&edition=2021&gist=f7d3c5b2663c9bd3ab7abdb0bd38ee43) for the current-version output for the test cases added in this PR). It will now try to construct a relative path path to the module and suggest it instead.
changelog: [`redundant_closure_for_method_calls`] Fix incorrect path suggestions for types within local modules
FP: `needless_return_with_question_mark` with implicit Error Conversion
Return with a question mark was triggered in situations where the `?` desuraging was performing error conversion via `Into`/`From`.
The desugared `?` produces a match over an expression with type `std::ops::ControlFlow<B,C>` with `B:Result<Infallible, E:Error>` and `C:Result<_, E':Error>`, and the arms perform the conversion. The patch adds another check in the lint that checks that `E == E'`. If `E == E'`, then the `?` is indeed unnecessary.
changelog: False Positive: [`needless_return_with_question_mark`] when implicit Error Conversion occurs.
fixes: #11982
fix: incorrect suggestions generated by `manual_retain` lint
fixes#10393, fixes#11457, fixes#12081#10393: In the current implementation of `manual_retain`, if the argument to the closure is matched using tuple, they are all treated as the result of a call to `map.into_iter().filter(<f>)`. However, such tuple pattern matching can also occur in many different containers that stores tuples internally. The correct approach is to apply different lint policies depending on whether the receiver of `into_iter` is a map or not.
#11457 and #12081: In the current implementation of `manual_retain`, if the argument to the closure is `Binding`, the closure will be used directly in the `retain` method, which will result in incorrect suggestion because the first argument to the `retain` closure may be of a different type. In addition, if the argument to the closure is `Ref + Binding`, the lint will simply remove the `Ref` part and use the `Binding` part as the argument to the new closure, which will lead to bad suggestion for the same reason. The correct approach is to detect each of these cases and apply lint suggestions conservatively.
changelog: [`manual_retain`] refactor and add check for various patterns
Fix/Issue11932: assert* in multi-condition after unrolling will cause lint `nonminimal_bool` emit warning
fixes [Issue#11932](https://github.com/rust-lang/rust-clippy/issues/11932)
After `assert`, `assert_eq`, `assert_ne`, etc, assert family marcos unrolling in multi-condition expressions, lint `nonminimal_bool` will recognize whole expression as a entirety, analyze each simple condition expr of them, and check whether can simplify them.
But `assert` itself is a entirety to programmers, we don't need to lint on `assert`. This commit add check whether lint snippet contains `assert` when try to warning to an expression.
changelog: [`nonminimal_bool`] add check for condition expression
[`never_loop`]: recognize desugared `try` blocks
Fixes#12205
The old code assumed that only blocks with an explicit label can be jumped to (using `break`). This is mostly correct except for `try` desugaring, where the `?` operator is rewritten to a `break` to that block, even without a label on the block. `Block::targeted_by_break` is a little more accurate than just checking if a block has a label in that regard, so we should just use that instead
changelog: [`never_loop`]: avoid linting when `?` is used inside of a try block
