Each of `{D,Subd}iagnosticMessage::{Str,Eager}` has a comment:
```
// FIXME(davidtwco): can a `Cow<'static, str>` be used here?
```
This commit answers that question in the affirmative. It's not the most
compelling change ever, but it might be worth merging.
This requires changing the `impl<'a> From<&'a str>` impls to `impl
From<&'static str>`, which involves a bunch of knock-on changes that
require/result in call sites being a little more precise about exactly
what kind of string they use to create errors, and not just `&str`. This
will result in fewer unnecessary allocations, though this will not have
any notable perf effects given that these are error paths.
Note that I was lazy within Clippy, using `to_string` in a few places to
preserve the existing string imprecision. I could have used `impl
Into<{D,Subd}iagnosticMessage>` in various places as is done in the
compiler, but that would have required changes to *many* call sites
(mostly changing `&format("...")` to `format!("...")`) which didn't seem
worthwhile.
Fixing `invalid_regex` with invalid UTF8. Also, adding more test cases
Fixing false positive and false negative when dealing with regex that could match invalid UTF8.
This PR fixes https://github.com/rust-lang/rust-clippy/issues/10825
changelog: [`invalid_regex`]: Fixing false positive and false negative when dealing with regex that could match invalid UTF8
Improve pattern printing for manual_let_else
* Address a formatting issue pointed out in https://github.com/rust-lang/rust-clippy/pull/10175/files#r1137091002
* Replace variables inside | patterns in the if let: `let v = if let V::A(v) | V::B(v) = v { v } else ...`
* Support nested patterns: `let v = if let Ok(Ok(Ok(v))) = v { v } else ...`
* Support tuple structs with more than one arg: `let v = V::W(v, _) = v { v } else ...`; note that more than one *capture* is still not supported, so it bails for `let (v, w) = if let E::F(vi, wi) = x { (vi, wi)}`
* Correctly handle .. in tuple struct patterns: `let v = V::X(v, ..) = v { v } else ...`
- \[ ] Followed [lint naming conventions][lint_naming]
- \[x] Added passing UI tests (including committed `.stderr` file)
- \[x] `cargo test` passes locally
- \[ ] Executed `cargo dev update_lints`
- \[ ] Added lint documentation
- \[x] Run `cargo dev fmt`
[lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints
---
changelog: [`manual_let_else`]: improve variable name in suggestions
Closes#10431 as this PR is adding a test for the `mut` case.
Ignore `#[cfg]`'d out code in `needless_else`
changelog: none (same release as #10810)
`#[cfg]` making things fun once more
This lead me to think about macro calls that expand to nothing as well, but apparently they produce an empty stmt in the AST so are already handled, added a test for that
r? `@llogiq`
[`default_constructed_unit_structs`]: do not lint on type alias paths
Fixes#10755.
Type aliases cannot be used as a constructor, so this lint should not trigger in those cases.
I also changed `clippy_utils::is_ty_alias` to also consider associated types since [they kinda are type aliases too](48ec50ae39/compiler/rustc_resolve/src/late/diagnostics.rs (L1520)).
changelog: [`default_constructed_unit_structs`]: do not lint on type alias paths
[`unused_async`]: do not consider `await` in nested `async` blocks as used
Fixes#10800.
This PR makes sure that `await` expressions inside of inner `async` blocks don't prevent the lint from triggering.
For example
```rs
async fn foo() {
async {
std::future::ready(()).await;
}
}
```
Even though there *is* a `.await` expression in this function, it's contained in an async block, which means that the enclosing function doesn't need to be `async` too.
changelog: [`unused_async`]: do not consider `await` in nested `async` blocks as used
validate lint name in `clippy_dev`
This PR adds a little bit of validation to `cargo dev new_lint`. I've had it happen a few times where I wanted to add a new lint, but forgot that lint names cannot contain `-`. If you try to do it anyway, `clippy_dev` will generate illegal syntax (like adding `mod test-lint;` to clippy_lints/src/lib.rs for the module declaration). Maybe having it error out early would be helpful to others too.
changelog: none
Add new lint `ptr_cast_constness`
This adds a new lint which functions as the opposite side of the coin to `ptr_as_ptr`. Rather than linting only as casts that don't change constness, this lints only constness; suggesting to use `pointer::cast_const` or `pointer::cast_mut` instead.
changelog: new lint [`ptr_cast_constness`]
needless_else: new lint to check for empty `else` clauses
Empty `else` clauses are useless. They happen in the wild and are not linted yet: https://github.com/uutils/coreutils/pull/4880/files
`else` clauses containing or preceded by comments are not linted as the comments might be important.
changelog: [`needless_else`]: new lint
Fix missing block for unsafe code
If a block is declared as unsafe, it needs an extra layer of curly braces around it.
Fixes#10808
This code adds handling for `UnsafeSource::UserProvided` block, i.e. `unsafe { ... }`. Note that we do not handle the `UnsafeSource::CompilerGenerated` as it seems to not be possible to generate that with the user code (?), or at least doesn't seem to be needed to be handled explicitly.
There is an issue with this code: it does not add an extra indentation for the unsafe blocks. I think this is a relatively minor concern for such an edge case, and should probably be done by a separate PR (fixing compile bug is more important than getting styling perfect especially when `rustfmt` will fix it anyway)
```rust
// original code
unsafe {
...
}
// code that is now generated by this PR
{ unsafe {
...
} }
// what we would ideally like to get
{
unsafe {
...
}
}
```
changelog: [`single_match`](https://rust-lang.github.io/rust-clippy/master/#single_match): Fix suggestion for `unsafe` blocks
[`large_stack_arrays`]: check array initializer expressions
Fixes#10741.
Prior to this PR, the lint only checked array repeat expressions (ie. `[T; n]`). Now it also checks array initializer expressions.
changelog: [`large_stack_arrays`]: check array initializer expressions
