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Add ui test suggest-remove-deref-issue-140166

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Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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xizheyin 2025-05-07 17:27:56 +08:00
parent d7df5bdf29
commit f46806fb14
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2 changed files with 44 additions and 0 deletions
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18
tests/ui/traits/suggest-remove-deref-issue-140166.rs Normal file
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@ -0,0 +1,18 @@
trait Trait {}
struct Chars;
impl Trait for Chars {}
struct FlatMap<T>(T);
impl<T: Trait> std::fmt::Debug for FlatMap<T> {
fn fmt(&self, _: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
unimplemented!()
}
}
fn lol() {
format_args!("{:?}", FlatMap(&Chars));
//~^ ERROR the trait bound `&Chars: Trait` is not satisfied [E0277]
}
fn main() {}

26
tests/ui/traits/suggest-remove-deref-issue-140166.stderr Normal file
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@ -0,0 +1,26 @@
error[E0277]: the trait bound `&Chars: Trait` is not satisfied
--> $DIR/suggest-remove-deref-issue-140166.rs:14:26
|
LL | format_args!("{:?}", FlatMap(&Chars));
| ---- ^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for `&Chars`
| |
| required by a bound introduced by this call
|
note: required for `FlatMap<&Chars>` to implement `Debug`
--> $DIR/suggest-remove-deref-issue-140166.rs:7:16
|
LL | impl<T: Trait> std::fmt::Debug for FlatMap<T> {
| ----- ^^^^^^^^^^^^^^^ ^^^^^^^^^^
| |
| unsatisfied trait bound introduced here
note: required by a bound in `core::fmt::rt::Argument::<'_>::new_debug`
--> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
help: consider removing the leading `&`-reference
|
LL - format_args!("{:?}", FlatMap(&Chars));
LL + format_args!("{:?}", latMap(&Chars));
|
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.