Add test for pattern_type_mismatch.
This issue has been fixed by [commit](8c1c763c2d)
This PR is used for close #7946(Fixes#7946).
changelog: Add test for pattern_type_mismatch.
Improve `strlen_on_c_string`
fixes: #7436
changelog: lint `strlen_on_c_string` when used without a fully-qualified path
changelog: suggest removing the surrounding unsafe block for `strlen_on_c_string` when possible
Prior to PR #91205, checking for errors in the overall obligation
would check checking the `ParamEnv`, due to an incorrect
`super_visit_with` impl. With this bug fixed, we will now
bail out of impl candidate assembly if the `ParamEnv` contains
any error types.
In practice, this appears to be overly conservative - when an error
occurs early in compilation, we end up giving up early for some
predicates that we could have successfully evaluated without overflow.
By only checking for errors in the predicate itself, we avoid causing
additional spurious 'type annotations needed' errors after a 'real'
error has already occurred.
With this PR, the diagnostic changes caused by PR #91205 are reverted.
Add `needless_late_init` lint
examples:
```rust
let a;
a = 1;
// to
let a = 1;
```
```rust
let b;
match 3 {
0 => b = "zero",
1 => b = "one",
_ => b = "many",
}
// to
let b = match 3 {
0 => "zero",
1 => "one",
_ => "many",
};
```
```rust
let c;
if true {
c = 1;
} else {
c = -1;
}
// to
let c = if true {
1
} else {
-1
};
```
changelog: Add [`needless_late_init`]
Visit `param_env` field in Obligation's `TypeFoldable` impl
This oversight appears to have gone unnoticed for a long time
without causing issues, but it should still be fixed.
Add new lint `octal_escapes`
This checks for sequences in strings that would be octal character
escapes in C, but are not supported in Rust. It suggests either
to use the `\x00` escape, or an equivalent hex escape if the octal
was intended.
Fixes#7981
---
*Please write a short comment explaining your change (or "none" for internal only changes)*
changelog: Add new lint [`octal_escapes`], which checks for literals like `"\033[0m"`.
Allow `suboptimal_flops` in const functions
This PR allows `clippy::suboptimal_flops` in constant functions. The check also effects the `clippy::imprecise_flops` lint logic. However, this doesn't have any effects as all functions checked for are not const and can therefore not be found in such functions.
---
changelog: [`suboptimal_flops`]: No longer triggers in constant functions
Closes: rust-lang/rust-clippy#8004
This checks for sequences in strings that would be octal character
escapes in C, but are not supported in Rust. It suggests either
to use the `\x00` escape, or an equivalent hex escape if the octal
was intended.
Pluralize `disallowed_type` lint
This was brought up in [Zulip] and is also mentioned in the lint naming
conventions. Since this is still a nursery lint, I think there shouldn't
be any problem in renaming it.
[Zulip]: rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/disallow_type.20vs.20disallowed-types
changelog: Rename nursery lint [`disallowed_type`] to [`disallowed_types`].
Improve `needless_borrow` lint
fixes: #5327fixes: #1726fixes: #1212
This is merging `needless_borrow` into the `dereference` pass in preparation for `explicit_auto_deref`. `explicit_auto_deref` needs to implement most of what `needless_borrow` implements in order to work.
There is a minor regression here where `let x: &str = &x.deref()` will trigger `needless_borrow` without triggering `explicit_deref_methods`. Removing the redundant borrow will cause `explicit_deref_methods` to trigger. This will be fixed when `explicit_auto_deref` is implemented.
changelog: Lint `needless_borrow` when a borrow is auto-derefed more than once
changelog: Lint `needless_borrow` in the trailing expression of a block for a match arm
Don't show no_effect warning on unit structs implementing fn_once
Fixes#7792
changelog: Don't show [`no_effect`] or [`unecessary_operation`] warning for unit struct implementing FnOnce
Fix for #7889 and add new lint needless_splitn
fixes: #7889
1. Fix the problem of manual_split_once changing the original behavior.
2. Add a new lint needless_splitn.
changelog: Fix the problem of manual_split_once changing the original behavior and add a new lint needless_splitn.
1. Fix the problem of manual_split_once changing the original behavior.
2. Add a new lint needless_splitn.
changelog: Fix the problem of manual_split_once changing the original behavior and add a new lint needless_splitn.
Fix `needless_collect`'s tendency to suggest code requiring multiple mutable borrows of the same value.
Fixes error specified in #7975.
changelog: [`needless_collect`] no longer suggests removal of `collect` when removal would create code requiring mutably borrowing a value multiple times.
* Lint when a borrow is auto dereferenced more than once
* Lint when the expression is used as the expression of a block for a match arm
Moves `needless_borrow` and `ref_binding_to_reference` to `dereference`
lint pass in preperation for `explicit_auto_deref` lint.
Support suggestion for #7854
I think the detection of parking_lot's mutex and rwlock is valuable, so submit this pr, please help judge and review, thank you.
Make let_underscore_lock support parking_lot.(Fixes#7854)
changelog: Make let_underscore_lock support parking_lot
I think the detection of parking_lot's mutex and rwlock is valuable, so submit this pr, please help judge and review, thank you.
Make let_underscore_lock support parking_lot.
changelog: Make let_underscore_lock support parking_lot
Lint for bool to integer casts in `cast_lossless`
The lint description says
> Checks for casts between *numerical* types that may be replaced by safe conversion functions.
Which is strictly speaking being violated here, but it seems within the spirit of the lint. I think it is still a useful lint to have, and having a different lint for just this feels excessive. Thoughts?
Fixes#7947
changelog: Lint for bool to integer casts in [`cast_lossless`]
Author improvements
changelog: none
Various aspects of the author implementation are re-imagined to be much less repetitive. Also fixes some bugs. I hope this makes author more fun to work on for future contributors.
The last commit is pretty heavy but I tried to at least separate some changes so that the test file diffs per commit are simple.
* Finding pattern slices for `avoidable_slice_indexing`
* `avoidable_slice_indexing` analysing slice usage
* Add configuration to `avoidable_slice_indexing`
* Emitting `avoidable_slice_indexing` with suggestions
* Dogfooding and fixing bugs
* Add ui-toml test for `avoidable_slice_indexing`
* Correctly suggest `ref` keywords for `avoidable_slice_indexing`
* Test and document `mut` for `avoid_slice_indexing`
* Handle macros with `avoidable_slice_indexing` lint
* Ignore slices with sub patterns in `avoidable_slice_indexing`
* Update lint description for `avoidable_slice_indexing`
* Move `avoidable_slice_indexing` to nursery
* Added more tests for `avoidable_slice_indexing`
* Update documentation and message for `avoidable_slice_indexing`
* Teach `avoidable_slice_indexing` about `HirId`s and `Visitors`
* Rename lint to `index_refutable_slice` and connected config
Add Clippy version to Clippy's lint list
Hey, hey, the semester is finally over, and I wanted to get back into hacking on Clippy. It has also been some time since our metadata collection monster has been feed. So, this PR adds a new attribute `clippy::version` to document which version a lint was stabilized. I considered using `git blame` but that would be very hacky and probably not accurate.
I'm also thinking that this attribute can be used to have a `clippy::nightly` lint group which is allow-by-default that delays setting the actual lint group until the defined version is reached. Just something to consider regarding #6623🙃
This PR only adds the version to 4 lints to keep it reviewable. I'll do a followup PR to add the version to other lints if the implementation is accepted 🙃
Also, mobile approved xD
---
r? `@flip1995`
cc: #7172closes: #6492
changelog: [Clippy's lint list](https://rust-lang.github.io/rust-clippy/master/index.html) now displays the version a lint was added. 🎉
---
Example lint declaration after this update:
```rs
declare_clippy_lint! {
/// [...]
///
/// ### Example
/// ```rust
/// // Bad
/// let x = 3.14;
/// // Good
/// let x = std::f32::consts::PI;
/// ```
#[clippy::version = "pre 1.29.0"]
pub APPROX_CONSTANT,
correctness,
"the approximate of a known float constant (in `std::fXX::consts`)"
}
```
Fix `explicit_counter_loop` suggestion for non-usize types
changelog: Add a new suggestion for non-usize types in [`explicit_counter_loop`]
closes: #7920
