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b4b483574f
Don't fire `OPAQUE_HIDDEN_INFERRED_BOUND` on sized return of AFIT
Conceptually, we should probably not fire `OPAQUE_HIDDEN_INFERRED_BOUND` for methods like:
```
trait Foo { async fn bar() -> Self; }
```
Even though we technically cannot prove that `Self: Sized`, which is one of the item bounds of the `Output` type in the `-> impl Future<Output = Sized>` from the async desugaring.
This is somewhat justifiable along the same lines as how we allow regular methods to return `-> Self` even though `Self` isn't sized.
Fixes #113538
(side-note: some days i wonder if we should just remove the `OPAQUE_HIDDEN_INFERRED_BOUND` lint... it does make me sad that we have non-well-formed types in signatures, though.)
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