Fix more false positives for `extra_unused_type_parameters`
Builds on #10321. All empty functions are no longer linted, instead of just those that have trait bounds on them. Also, if a trait bound contains a non-public trait (un-exported, but still potentially reachable), then the corresponding type parameter isn't linted.
Finally, added support for the `avoid_breaking_exported_api` config option.
r? `@flip1995`
changelog: none
Update readme description of `restriction` lints to dissuade casual use.
Adds some stronger wording about not enabling `restriction` lints. I've seen it come up a few times where people are confused about what the `restriction` category is for and end up casually enabling lints from it (or the whole category).
changelog: None
Normalize projections types when checking `explicit_auto_deref`
fixes#10384
changelog: [`explicit_auto_deref`]: Better consider projection types when checking if auto deref is applicable
Ignore lifetimes from differing contexts in `needless_lifetimes`
Fixes#10379
changelog: [`needless_lifetimes`]: Don't lint signatures in macros if the lifetime is a metavariable
Add `impl_trait_in_params` lint
As this is a lint about style, and using `impl Trait` is purely cosmetical (even with downsides), a lot of unrelated files needed to allow this lint.
---
Resolves#10030
changelog: New lint: [`impl_trait_in_params`]
[10197](https://github.com/rust-lang/rust-clippy/pull/10197)
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Add configuration to lint missing docs of `pub(crate)` items
Fixes this: https://github.com/rust-lang/rust-clippy/issues/5736#issuecomment-1412442404
TODO:
- [x] Needs docs
- [x] Needs better names
- [x] Should `pub` items be checked to when this new option is enabled? I'm saying no because `missing_docs` already exists
`@flip1995` I'd like to get some input from you :)
---
changelog: Enhancement: [`missing_docs_in_private_items`]: Added new configuration `missing-docs-in-crate-items` to lint on items visible within the current crate. For example, `pub(crate)` items.
[#10303](https://github.com/rust-lang/rust-clippy/pull/10303)
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Box::default(): do not omit the type of the removed trait object
Within a larger expression, when the type of `Box::new(T::default())` is `Box<dyn Trait>`, the concrete type `T` cannot be omitted in the proposed replacement `Box::<T>::default()`.
Fixes#10381
changelog: [`box_default`]: in case of a trait object do not omit the concrete type name
Within a larger expression, when the type of `Box::new(T::default())` is
`Box<dyn Trait>`, the concrete type `T` cannot be omitted in the
proposed replacement `Box::<T>::default()`.
[significant_drop_tightening] Evaluate the return expression of a block
For whatever reason, the return expression of a block is not contained inside the slice of statements and because of that the lint wasn't evaluating things that could potentially block the release of a lock.
```rust
pub fn example() -> i32 {
let mutex = Mutex::new(1);
let lock = mutex.lock().unwrap();
let _ = *lock;
let _ = *lock;
do_heavy_computation_that_takes_time_and_returns_i32()
}
```
---
changelog: none
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[significant_drop_tightening] Ignore inexpensive statements
Not all statements that follow the last use of a lock guard are expensive and can therefore be ignored by the lint.
```rust
pub fn foo() -> i32 {
let mutex = Mutex::new(1);
let lock = mutex.lock().unwrap();
let rslt = *lock;
let another = rslt;
another
}
```
---
changelog: [`significant_drop_tightening`]: No longer lints for inexpensive statements after the lock guard
[#10363](https://github.com/rust-lang/rust-clippy/pull/10363)
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manual_let_else: do not suggest semantically different replacements
The problem is that this lint does not consider the possibility that the divergent branch can come first and that the patterns may overlap. This led to incorrect suggestions, previously registered as correct in the tests themselves:
```rust
let v = match build_enum() {
_ => continue,
Variant::Bar(v) | Variant::Baz(v) => v,
};
```
had a `let Variant::Bar(v) | Variant::Baz(v) = v else { continue; }` suggestion, which is obviously wrong as the original code `continue`s in any case. Issue #10241 gives another example.
The code now checks that the divergent branch comes second. It could be extended later (I've added a TODO) to check for non-overlapping patterns.
Fixes#10241.
changelog: [`manual_let_else`] do not suggest non equivalent replacements in `match`
Stop bytes_nth from suggesting code that does not compile
Fixes#10151
As discussed in the issue, this PR changes the lint in 2 ways
1. Replace `bytes().nth(n).unwrap()` with `as_bytes()[n]`
2. Replace other `bytes().nth(n)` with `as_bytes().get(n).copied()`
---
changelog: Stop bytes_nth from suggesting code that does not compile in some cases
Stop doc_markdown requiring backticks on links to external websites
Fixes#10302
This lint currently checks that any link should be enclosed with `backticks` if the title looks like a lang item. This PR changes the lint to only run on internal links. External links, indicated by `http` or `https`, are skipped.
This PR also reorganises `pulldown_cmark` imports to bypass the clippy lint enforcing 100 line functions.
---
changelog: Stop doc_markdown requiring backticks on links to external websites
Add the `transmute_int_to_non_zero` lint
Fixes#10288
This adds a new complexity lint `transmute_int_to_non_zero` which checks for transmutes to any of the `NonZero*` types, and suggests their `new_unchecked` method instead.
r? `@llogiq`
changelog: New lint: [`transmute_int_to_non_zero`]
Add question-mark-used lint
This lint complains when the question mark operator (try operator) is used. This is a restriction lint that can be useful on local scopes where a custom error handling macro is supposed to be used to augment the error based on local scope data before returning.
Fixes#10340
---
changelog: New lint [`question_mark_used`]
[#10342](https://github.com/rust-lang/rust-clippy/pull/10342)
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Add `let_underscore_untyped`
Fixes#6842
This adds a new pedantic `let_underscore_untyped` lint which checks for `let _ = <expr>`, and suggests to either provide a type annotation, or to remove the `let` keyword. That way the author is forced to specify the type they intended to ignore, and thus get forced to re-visit the decision should the type of `<expr>` change. Alternatively, they can drop the `let` keyword to truly just ignore the value no matter what.
r? `@llogiq`
changelog: New lint: [let_underscore_untyped]
[significant_drop_tightening] Add MVP
cc #9399
Creates the lint with minimum functionalities, which is a good start IMO.
---
changelog: new lint: [`significant_drop_tightening`]
[#10163](https://github.com/rust-lang/rust-clippy/pull/10163)
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Change unusual_byte_groupings to require byte groupings of equal size
Fixes issue #6556
This lint required byte groupings of size 2 or 4 for `Radix::Binary` and `Radix::Hexadecimal`. Since there are good reasons for allowing groups of other sizes, this PR relaxes the restriction. This lint now requires that
- group sizes after the first group be of the same size and
- greater or equal in size to the first group.
---
changelog: [`unusual_byte_groupings`]: reduce false positives by relaxing restriction requiring groups of specific sizes.
As this is a lint about "style", and a purely cosmetical choice (using `<A: Trait>` over `impl Trait`), a lot of other files needed to be allowed this lint.
Ignore synthetic type parameters for `extra_unused_type_parameters`
There was a minor bug around calculating spans when forming the help message. An example:
```rust
fn unused_opaque<A, B>(dummy: impl Default) {}
// ^^ ^
```
In this case, the entire list of generics should be highlighted, instead of each individual parameter. The culprit is the `impl Default`, which registers as a type parameter but doesn't live within the `<...>`. Because synthetic parameters can't ever be manually created, we just ignore them for this lint.
r? `@flip1995`
changelog: none
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Fix false positives for `extra_unused_type_parameters`
Don't lint external macros. Also, if the function body is empty, any type parameters with bounds on them are not linted. Note that only the body needs be empty - this rule still applies if the function takes any arguments.
fixes#10318fixes#10319
changelog: none
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uninlined_format_args: do not inline argument with generic parameters
Fix#10339
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changelog: FP: [`uninlined_format_args`]: No longer lints for arguments with generic parameters
[#10343](https://github.com/rust-lang/rust-clippy/pull/10343)
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fix [`needless_return`] incorrect suggestion when returning if sequence
fixes: #10049
---
changelog: [`needless_return`]: fix incorrect suggestion on if sequence
