bjoernager/rust
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Account for RPITIT in E0310 explicit lifetime constraint suggestion

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When given

```rust
trait Original {
    fn f() -> impl Fn();
}

trait Erased {
    fn f(&self) -> Box<dyn Fn()>;
}

impl<T: Original> Erased for T {
    fn f(&self) -> Box<dyn Fn()> {
        Box::new(<T as Original>::f())
    }
}
```

avoid suggestion to restrict the `Trait::{opaque}` type in a `where` clause:

```
error[E0310]: the associated type `<T as Original>::{opaque#0}` may not live long enough
  --> $DIR/missing-static-bound-from-impl.rs:11:9
   |
LL |         Box::new(<T as Original>::f())
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |         |
   |         the associated type `<T as Original>::{opaque#0}` must be valid for the static lifetime...
   |         ...so that the type `impl Fn()` will meet its required lifetime bounds
```

CC #119773.
This commit is contained in:
Esteban Küber 2024-02-22 06:15:55 +00:00
parent 933a05bd0b
commit 5e6da720f6
4 changed files with 36 additions and 2 deletions
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12
tests/ui/impl-trait/in-trait/missing-static-bound-from-impl.stderr Normal file
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@ -0,0 +1,12 @@
error[E0310]: the associated type `<T as Original>::{opaque#0}` may not live long enough
--> $DIR/missing-static-bound-from-impl.rs:11:9
|
LL | Box::new(<T as Original>::f())
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| the associated type `<T as Original>::{opaque#0}` must be valid for the static lifetime...
| ...so that the type `impl Fn()` will meet its required lifetime bounds
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0310`.