[`redundant_guards`]: catch `is_empty`, `starts_with` and `ends_with` on slices and `str`s
Fixes#11807
Few things worth mentioning:
- Taking `snippet`s is now done at callsite, instead of passing a span and doing it in `emit_redundant_guards`. This is because we now need custom suggestion strings in certain places, like `""` for `str::is_empty`.
- This now uses `snippet` instead of `snippet_with_applicability`. I don't think this really makes any difference for `MaybeIncorrect`, though?
- This could also lint byte strings, as they're of type `&[u8; N]`, but that can be ugly so I decided to leave it out for now
changelog: [`redundant_guards`]: catch `str::is_empty`, `slice::is_empty`, `slice::starts_with` and `slice::ends_with`
[`redundant_closure_call`]: avoid duplicated `async` keyword when triggering on closure that returns `async` block
close#11357
----
*Please write a short comment explaining your change (or "none" for internal only changes)*
changelog: [`redundant_closure_call`]: avoid duplicated `async` keyword when triggering on closure that returns `async` block
Don't suggest `a.mul_add(b, c)` if parameters are not float
clippy::suboptimal_flops used to not check if the second parameter to f32/f64.mul_add() was float. Since the method is only defined to take `Self` as parameters, the suggestion was wrong.
Fixes#11831
changelog: [`suboptimal_float`]: Don't suggest `a.mul_add(b, c)` if parameters are not f32/f64
[`ptr_arg`]: recognize methods that also exist on slices
Fixes#11816
Not a new lint, just a very small improvement to the existing `ptr_arg` lint which would have caught the linked issue.
The problem was that the lint checks if a `Vec`-specific method was called, that is, if the receiver is `Vec<_>`.
This is the case for `len` and `is_empty`, however these methods also exist on slices so we can still lint there.
This logic exists in a different lint, so we can just reuse that here.
Interestingly, there was even a comment up top that explained what it should have been doing, but the logic for it just wasn't there?
changelog: [`ptr_arg`]: recognize methods that also exist on slices
<sub>Also, this is my 100th PR to clippy 🎉 </sub>
`manual_try_fold`: check that `fold` is really `Iterator::fold`
Fix#11876
changelog: [`manual_try_fold`]: suggest using `try_fold` only for `Iterator::fold` uses
Move `implied_bounds_in_impls` back to complexity
This lint was originally in the complexity category when I PR'd it. It was then moved to nursery by me due to a number of issues (a false positive, an invalid suggestion and an ICE), but that was probably an overreaction and all of the issues were fixed quickly after.
This is a useful lint imo and there hasn't been any issues with it in a few months, so I say we should give it another try and move it back to complexity.
I did a lintcheck run on the top 400 crates and all of them are legitimate, with 18 warnings. Most of them are from anstyle having a `impl Display + Copy + Clone` return type, or the bitvec crate with a return type like `impl Iterator + DoubleEndedIterator`.
changelog: Move [`implied_bounds_in_impls`] to `complexity` (Now warn-by-default)
[#11867](https://github.com/rust-lang/rust-clippy/pull/11867)
Fix `box_default` behaviour with empty `vec![]` coming from macro arg
Fix#11868
changelog: [`box_default`]: do not warn on `Box::new(vec![])` if the `vec![]` comes from a macro argument
Create new lint `option_map_or_err_ok`
Fixes#10045.
For the following code:
```rust
let opt = Some(1);
opt.map_or(Err("error"), Ok);
```
It suggests to instead write:
```rust
let opt = Some(1);
opt.ok_or("error");
```
r? `@flip1995`
changelog: Create new lint `option_map_or_err_ok`
suggest alternatives to iterate an array of ranges
works towards #7125
changelog: [`single_element_loop`]: suggest better syntax when iterating over an array of a single range
`@thinkerdreamer` and myself worked on this issue during a workshop by `@llogiq` at the RustLab 2023 conference. It is our first contribution to clippy.
When iterating over an array of only one element, _which is a range_, our change suggests to replace the array with the contained range itself. Additionally, a hint is printed stating that the user probably intended to iterate over the range and not the array. If the single element in the array is not a range, the previous suggestion in the form of `let {pat_snip} = {prefix}{arg_snip};{block_str}`is used.
This change lints the array with the single range directly, so any prefixes or suffixes are covered as well.
Nit re `matches!` formatting
I think formatting `matches!` with `if` guards is [still unsupported](https://github.com/rust-lang/rustfmt/issues/5547), which is probably why this was missed.
changelog: none
[`deprecated_semver`]: Allow `#[deprecated(since = "TBD")]`
"TBD" is allowed by rustdoc, saying that it will be deprecated in a future version. rustc will also not actually warn on it.
I found this while checking the rust-lang/rust with clippy.
changelog: [`deprecated_semver`]: allow using `since = "TBD"`
[`missing_asserts_for_indexing`]: work with bodies instead of blocks separately
Fixes#11856
Before this change, this lint would check blocks independently of each other, which means that it misses `assert!()`s from parent blocks.
```rs
// check_block
assert!(x.len() > 1);
{
// check_block
// no assert here
let _ = x[0] + x[1];
}
```
This PR changes it to work with bodies rather than individual blocks. That means that a function will be checked in one go and we can remember if an `assert!` occurred anywhere.
Eventually it would be nice to have a more control flow-aware analysis, possibly by rewriting it as a MIR lint, but that's more complicated and I wanted this fixed first.
changelog: [`missing_asserts_for_indexing`]: accept `assert!`s from parent blocks
Improve error messages format
Following review in https://github.com/rust-lang/rust-clippy/pull/11845, since there is already suggestions, no need to add the second part of the sentence every time.
r? `@flip1995`
changelog: Improve some error messages
Extend `result_map_or_into_option` lint to handle `Result::map_or_else(|_| None, Some)`
Fixes https://github.com/rust-lang/rust-clippy/issues/10365.
As indicated in the title, it extends the `result_map_or_into_option` lint to handle `Result::map_or_else(|_| None, Some)`.
changelog: extension of the `result_map_or_into_option` lint to handle `Result::map_or_else(|_| None, Some)`
r? `@blyxyas`
Add documentation update hint using `cargo collect-metadata`
This adds a little reminder to update the documentation in the book using `cargo collect-metadata` after changing the lint configuration since this can easily be missed (been there done that 🙈).
> Yeah a note would be good, would be good for us to see if we can make it automatic also
_Originally posted by `@Alexendoo` in https://github.com/rust-lang/rust-clippy/issues/11757#issuecomment-1823474156_
Regarding the automation Im not sure whats the best option here. I thought about a kind of a "semi-automated" way, e.g. a `cargo dev` command which runs the "is the documentation updated" check (and maybe other useful checks) locally and reminds the user of updating the documentation so this gets caught before pushing.
changelog: none
Fix iter_kv_map false positive into_keys and into_values suggestion
fixes: #11752
changelog: [`iter_kv_map`]: fix false positive: Don't suggest `into_keys()` and `into_values()` if the MSRV is to low
