[PATCH 07/19] rust: enable `clippy::ignored_unit_patterns` lint

Miguel Ojeda
2024-09-04T20:45:07Z

In Rust 1.73.0, Clippy introduced the `ignored_unit_patterns` lint [1]:

> Matching with `()` explicitly instead of `_` outlines the fact that
> the pattern contains no data. Also it would detect a type change
> that `_` would ignore.

There is only a single case that requires a change:

error: matching over `()` is more explicit
--> rust/kernel/types.rs:176:45
|
176 | ScopeGuard::new_with_data((), move |_| cleanup())
| ^ 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 `-D clippy::ignored-unit-patterns`

Thus clean it up and enable the lint -- no functional change intended.

Link: https://rust-lang.github.io/rust-clippy/master/index.html#/ignored_unit_patterns [1]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
Makefile | 1 +
rust/kernel/types.rs | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index f903309db91b..cc1b01590227 100644
--- a/Makefile
+++ b/Makefile
@@ -452,6 +452,7 @@ export rust_common_flags := --edition=2021 \
-Wunreachable_pub \
-Wclippy::all \
-Wclippy::dbg_macro \
+ -Wclippy::ignored_unit_patterns \
-Wclippy::mut_mut \
-Wclippy::needless_bitwise_bool \
-Wclippy::needless_continue \
diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index 6c2d5fa9bce3..4e03df725f3f 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -225,7 +225,7 @@ pub fn dismiss(mut self) -> T {
impl ScopeGuard<(), fn(())> {
/// Creates a new guarded object with the given cleanup function.
pub fn new(cleanup: impl FnOnce()) -> ScopeGuard<(), impl FnOnce(())> {
- ScopeGuard::new_with_data((), move |_| cleanup())
+ ScopeGuard::new_with_data((), move |()| cleanup())
}
}

--
2.46.0