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5e6da720f6
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.
17 lines
321 B
Rust
17 lines
321 B
Rust
trait Original {
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fn f() -> impl Fn();
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}
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trait Erased {
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fn f(&self) -> Box<dyn Fn()>;
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}
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impl<T: Original> Erased for T {
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fn f(&self) -> Box<dyn Fn()> {
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Box::new(<T as Original>::f())
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//~^ ERROR the associated type `<T as Original>::{opaque#0}` may not live long enough
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}
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}
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fn main () {}
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