CC #3770
From https://github.com/rust-lang/rust-clippy/issues/3770#issuecomment-687565594 (@flip1995):
> Oh I thought I replied to this: I definitely see now that having this
> as a correctness lint might be the wrong categorization. What we might
> want to do is to just allow this lint, if there are comments in the
> arm bodies. But a good first step would be to downgrade this lint to
> style or complexity. I would vote for style since merging two arms is
> not always less complex.
Implement new lint `iter_over_hash_type`
Implements and fixes https://github.com/rust-lang/rust-clippy/issues/11788
This PR adds a new *restriction* lint `iter_over_hash_type` which prevents `Hash`-types (that is, `HashSet` and `HashMap`) from being used as the iterator in `for` loops.
The justification for this is because in `Hash`-based types, the ordering of items is not guaranteed and may vary between executions of the same program on the same hardware. In addition, it reduces readability due to the unclear iteration order.
The implementation of this lint also ensures the following:
- Calls to `HashMap::keys`, `HashMap::values`, and `HashSet::iter` are also denied when used in `for` loops,
- When this expression is used in procedural macros, it is not linted/denied.
changelog: add new `iter_over_hash_type` lint to prevent unordered iterations through hashed data structures
fix: [manual_memcpy] reduce indexing suggestions when array length is equal to loop range
fixes: #11689
This PR improves `manual_memcpy` suggestions by reducing unnecessary indexing.
For example,
```rust
let src = [0, 1, 2, 3, 4];
let mut dest = [0; 4];
for i in 0..4 {
dest[i] = src[i];
{
```
Clippy suggests `dest[..4].copy_from_slice(&src[..4]);`.
I reduced this suggestion as `dest.copy_from_slice(&src[..4]);`. (Removed needless indexing.)
changelog: [`manual_memcpy`]: Reduce indexing suggestions when array length is equal to loop range
Removing @Centri3 from reviewer rotation
Catherine decided that the best course of action would be to (maybe temporarily) remove her from the reviewer's rotation (but not unassign her from her current reviews). This PR does that. She'll always be welcomed back if she wants to review some more ❤️
> Alejandra González: [youremyfrennow.mp4](https://rust-lang.zulipchat.com/user_uploads/4715/7nE2W6cb8Q02gcK-vubvmsPM/youremyfrennow.mp4)
>
>Catherine, Fred (`@xFrednet` ) noticed that you aren't as active as in the summer, and proposed that maybe you preferred to be removed from the reviewer rotation. Don't worry, you aren't being taken out of the team, just wanted to know if you maybe preferred to not have those reviews pilling up (they can be pretty stressful to see).
>
>If you decide to step out of the reviewers rotation, you wouldn't be removed from the team, you just wouldn't have that responsability. Everyone takes break and that's fine, so yeah, if you want to not have to review PRs, let me know!
>
>So yeah, from weird teenager transfem to (probably weird) teenager transfem, the choice is in your hand.
>
>Alejandra González: meow meow ^•ﻌ•^
>
>Catherine (Centri3): Yeah that's probably best now, I'll still try with any I'm currently assigned to but I would prefer not to get anymore until then
>Catherine (Centri3): meow meow :3
changelog:none
r? `@Centri3`
move `suspicious_doc_comments` to doc pass
This was my first lint. I've been meaning to move it over to `doc.rs` since that's a better place.
There weren't any changes made to the lint logic itself.
I guess this can be considered part of #11493
changelog: none
Don't check for late-bound vars, check for escaping bound vars
Fixes an assertion that didn't make sense. Many valid and well-formed types *have* late-bound vars (e.g. `for<'a> fn(&'a ())`), they just must not have *escaping* late-bound vars in order to be normalized correctly.
Addresses rust-lang/rust-clippy#11230, cc `@jyn514` and `@matthiaskrgr`
changelog: don't check for late-bound vars, check for escaping bound vars. Addresses rust-lang/rust-clippy#11230
Fixes to `manual_let_else`'s divergence check
A few changes to the divergence check in `manual_let_else` and moves it the implementation to `clippy_utils` since it's generally useful:
* Handle internal `break` and `continue` expressions.
e.g. The first loop is divergent, but the second is not.
```rust
{
loop {
break 'outer;
};
}
{
loop {
break;
};
}
```
* Match rust's definition of divergence which is defined via the type system.
e.g. The following is not considered divergent by rustc as the inner block has a result type of `()`:
```rust
{
'a: {
panic!();
break 'a;
};
}
```
* Handle when adding a single semicolon would make the expression divergent.
e.g. The following would be a divergent if a semicolon were added after the `if` expression:
```rust
{ if panic!() { 0 } else { 1 } }
```
changelog: None
Lint `needless_borrow` and `explicit_auto_deref` on most union field accesses
Changes both lints to follow rustc's rules around auto-deref through `ManuallyDrop` union fields rather than just bailing on union fields.
changelog: [`needless_borrow`] & [`explicit_auto_deref`]: Lint on most union field accesses
[`map_identity`]: respect match ergonomics
Fixes#11764
Note: the original tests before this were slightly wrong themselves already and had to be changed. They were calling `map` on an iterator of `&(i32, i32)`s, so this PR would stop linting there, but they were meant to test something else unrelated to binding modes, so I just changed them to remove the references so that it iterates over owned values and they all bind by value. This way they continue to test what they checked for before: the identity function for tuple patterns.
changelog: [`map_identity`]: respect match ergonomics
Replace if_chain with let chains
Closes#9353
Let chains are now supported by rustfmt 🎉
The PR is split into two commits
1. The result of running [`if-to-let-chain clippy*/**/*.rs`](https://github.com/Alexendoo/if-to-let-chain)
2. The manual clean up: fixing some errors/formatting, dogfood lints, removing the if_chain internal lint
r? `@flip1995`
changelog: none
Disable `vec_box` when using different allocators
Fixes#7114
This PR disables the `vec_box` lint when the `Box` and `Vec` use different allocators (but not when they use the same - custom - allocator).
For example - `Vec<Box<i32, DummyAllocator>>` will disable the lint, and `Vec<Box<i32, DummyAllocator>, DummyAllocator>` will not disable the lint.
In addition, the applicability of this lint has been changed to `Unspecified` due to the automatic fixes potentially breaking code such as the following:
```rs
fn foo() -> Vec<Box<i32>> { // -> Vec<i32>
vec![Box::new(1)]
}
```
It should be noted that the `if_chain->let-chains` fix has also been applied to this lint, so the diff does contain many changes.
changelog: disable `vec_box` lint when using nonstandard allocators
[`mod_module_files`] Don't emit lint for mod.rs in tests
fixes: #11775
current state: indiscriminately emits the lint for mod files in tests.
The following
```
tests/
common/
mod.rs
test.rs
```
is a common pattern for code shared across the tests and is suggested in the rust book. The change adds an additional check to verify that the mod file is not in tests.
changelog: Fix [`mod_module_files`]: false positive for mod files in tests folder
fixes: #11775
current state: indiscriminately emits the lint for mod files in tests.
The following
tests/
common/
mod.rs
test.rs
is a common pattern for code shared across the tests and is suggested in
the rust book. The change adds an additional check to verify that the
mod file is not in tests.
changelog: Fix [`mod_module_files`]: false positive for mod files in
tests folder
[arc_with_non_send_sync] Improve suggested resolution
Fixes: #11714
Improved the lint message for [`arc_with_non_send_sync`] to suggest using `RC` unless user needs an Arc, then suggests wrapping in a mutex, and then suggests implementing `Sync` and `Send`.
---
changelog: [`arc_with_non_send_sync`]: Suggest RC over unsafe impl of Send and Sync
