unused_unit triggers when the type annotation is needed to compile #14577
Description
Summary
When running the code snippet from the 2024 edition guide it triggers the unused_unit lint, even though removing the type annotation will make the code stop compiling.
Encountered in bevyengine/bevy#18778
Lint Name
unused_unit
Reproducer
trait Unit {} impl Unit for () {} fn run<R: Unit>(f: impl FnOnce() -> R) { f(); } fn main() { run(|| -> () { todo!() }); }Output
warning: unneeded unit return type --> src/main.rs:12:11 | 12 | run(|| -> () { todo!() }); | ^^^^^^ help: remove the `-> ()` | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit = note: `#[warn(clippy::unused_unit)]` on by default Version
Additional Labels
No response