[PATCH 6.18 738/752] rust: pin-init: replace clippy `expect` with `allow`

Sasha Levin
2026-02-28T17:59:14Z

From: Benno Lossin <lossin@kernel.org>

[ Upstream commit a58b8764aed9648357b1c5b6368c9943ba33b7f9 ]

`clippy` has changed behavior in [1] (Rust 1.95) where it no longer
warns about the `let_and_return` lint when a comment is placed between
the let binding and the return expression. Nightly thus fails to build,
because the expectation is no longer fulfilled.

Thus replace the expectation with an `allow`.

[ The errors were:

error: this lint expectation is unfulfilled
--> rust/pin-init/src/lib.rs:1279:10
|
1279 | #[expect(clippy::let_and_return)]
| ^^^^^^^^^^^^^^^^^^^^^^
|
= note: `-D unfulfilled-lint-expectations` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(unfulfilled_lint_expectations)]`

error: this lint expectation is unfulfilled
--> rust/pin-init/src/lib.rs:1295:10
|
1295 | #[expect(clippy::let_and_return)]
| ^^^^^^^^^^^^^^^^^^^^^^

- Miguel ]

Link: https://github.com/rust-lang/rust-clippy/pull/16461 [1]
Signed-off-by: Benno Lossin <lossin@kernel.org>
Cc: stable@vger.kernel.org # Needed in 6.18.y and later.
Link: https://patch.msgid.link/20260215132232.1549861-1-lossin@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
rust/pin-init/src/lib.rs | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rust/pin-init/src/lib.rs b/rust/pin-init/src/lib.rs
index dd553212836e0..0128808579973 100644
--- a/rust/pin-init/src/lib.rs
+++ b/rust/pin-init/src/lib.rs
@@ -1276,13 +1276,13 @@ pub const unsafe fn init_from_closure<T: ?Sized, E>(
///
/// - `*mut U` must be castable to `*mut T` and any value of type `T` written through such a
/// pointer must result in a valid `U`.
-#[expect(clippy::let_and_return)]
pub const unsafe fn cast_pin_init<T, U, E>(init: impl PinInit<T, E>) -> impl PinInit<U, E> {
// SAFETY: initialization delegated to a valid initializer. Cast is valid by function safety
// requirements.
let res = unsafe { pin_init_from_closure(|ptr: *mut U| init.__pinned_init(ptr.cast::<T>())) };
// FIXME: remove the let statement once the nightly-MSRV allows it (1.78 otherwise encounters a
// cycle when computing the type returned by this function)
+ #[allow(clippy::let_and_return)]
res
}

@@ -1292,13 +1292,13 @@ pub const unsafe fn cast_pin_init<T, U, E>(init: impl PinInit<T, E>) -> impl Pin
///
/// - `*mut U` must be castable to `*mut T` and any value of type `T` written through such a
/// pointer must result in a valid `U`.
-#[expect(clippy::let_and_return)]
pub const unsafe fn cast_init<T, U, E>(init: impl Init<T, E>) -> impl Init<U, E> {
// SAFETY: initialization delegated to a valid initializer. Cast is valid by function safety
// requirements.
let res = unsafe { init_from_closure(|ptr: *mut U| init.__init(ptr.cast::<T>())) };
// FIXME: remove the let statement once the nightly-MSRV allows it (1.78 otherwise encounters a
// cycle when computing the type returned by this function)
+ #[allow(clippy::let_and_return)]
res
}

--
2.51.0