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ignored-unit-patterns ignores mutability #11754
Description
EDIT
Using the following flags
--force-warn clippy::ignored-unit-patterns
this code:
//@ edition:2021
//@ check-pass
#![feature(coroutines, stmt_expr_attributes)]
fn main() {
let x = &mut ();
|| {
let _c = #[coroutine]
|| yield *&mut *x;
|| _ = &mut *x;
};
}caused the following diagnostics:
Checking _issue-110929-coroutine-conflict-error-ice v0.1.0 (/tmp/icemaker_global_tempdir.EuHmIYit9wj1/icemaker_clippyfix_tempdir.wfNVWxul8RLV/_issue-110929-coroutine-conflict-error-ice)
warning: matching over `()` is more explicit
--> src/main.rs:10:12
|
10 | || _ = &mut *x;
| ^ help: use `()` instead of `_`: `()`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ignored_unit_patterns
= note: requested on the command line with `--force-warn clippy::ignored-unit-patterns`
warning: `_issue-110929-coroutine-conflict-error-ice` (bin "_issue-110929-coroutine-conflict-error-ice") generated 1 warning (run `cargo clippy --fix --bin "_issue-110929-coroutine-conflict-error-ice"` to apply 1 suggestion)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s
However after applying these diagnostics, the resulting code:
//@ edition:2021
//@ check-pass
#![feature(coroutines, stmt_expr_attributes)]
fn main() {
let x = &mut ();
|| {
let _c = #[coroutine]
|| yield *&mut *x;
|| () = &mut *x;
};
}no longer compiled:
Checking _issue-110929-coroutine-conflict-error-ice v0.1.0 (/tmp/icemaker_global_tempdir.EuHmIYit9wj1/icemaker_clippyfix_tempdir.wfNVWxul8RLV/_issue-110929-coroutine-conflict-error-ice)
error[E0308]: mismatched types
--> src/main.rs:10:12
|
10 | || () = &mut *x;
| ^^ ------- this expression has type `&mut ()`
| |
| expected `&mut ()`, found `()`
For more information about this error, try `rustc --explain E0308`.
error: could not compile `_issue-110929-coroutine-conflict-error-ice` (bin "_issue-110929-coroutine-conflict-error-ice") due to 1 previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `_issue-110929-coroutine-conflict-error-ice` (bin "_issue-110929-coroutine-conflict-error-ice" test) due to 1 previous error
Version:
rustc 1.90.0-nightly (5e749eb66 2025-06-29)
binary: rustc
commit-hash: 5e749eb66f93ee998145399fbdde337e57cd72ef
commit-date: 2025-06-29
host: x86_64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.7
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