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fix: let-and-return suggests invalid cast (#16135) #16147

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fix: let-and-return suggests invalid cast (#16135) #16147

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5 changes: 4 additions & 1 deletion clippy_lints/src/returns/let_and_return.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,10 @@ pub(super) fn check_block<'tcx>(cx: &LateContext<'tcx>, block: &'tcx Block<'_>)
} else {
format!("({src})")
}
} else if !cx.typeck_results().expr_adjustments(retexpr).is_empty() {
} else if !cx.typeck_results().expr_adjustments(retexpr).is_empty()
// Do not suggest 'as _' for raw pointers; it's an invalid cast
&& !cx.typeck_results().expr_ty_adjusted(retexpr).is_raw_ptr()
{
if has_enclosing_paren(&src) {
format!("{src} as _")
} else {
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11 changes: 11 additions & 0 deletions tests/ui/let_and_return.edition2021.fixed
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Expand Up @@ -271,4 +271,15 @@ fn issue15987() -> i32 {
r
}

// https://github.com/rust-lang/rust-clippy/issues/16135
mod issue16135 {
struct S;
trait T {}
impl T for S {}

fn f(x: *const S) -> *const dyn T {
Clone::clone(&x) as _
}
}

fn main() {}
11 changes: 11 additions & 0 deletions tests/ui/let_and_return.edition2024.fixed
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Expand Up @@ -271,4 +271,15 @@ fn issue15987() -> i32 {
r
}

// https://github.com/rust-lang/rust-clippy/issues/16135
mod issue16135 {
struct S;
trait T {}
impl T for S {}

fn f(x: *const S) -> *const dyn T {
Clone::clone(&x) as _
}
}

fn main() {}
11 changes: 11 additions & 0 deletions tests/ui/let_and_return.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -271,4 +271,15 @@ fn issue15987() -> i32 {
r
}

// https://github.com/rust-lang/rust-clippy/issues/16135
mod issue16135 {
struct S;
trait T {}
impl T for S {}

fn f(x: *const S) -> *const dyn T {
Clone::clone(&x) as _
}
}
Comment on lines +275 to +283
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@Jarcho Jarcho Dec 12, 2025

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This doesn't test the lint. The function body should be:

let x = Clone::clone(&x);
x

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@ErinvanderVeen ErinvanderVeen Dec 12, 2025

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You're absolutely right. I'll try to get to this asap.


fn main() {}