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(cherry picked from commit 8f2af7e010945e6d57e839db2673e276e8bf6532)
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lifetimes
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r=GuillaumeGomez
rustdoc: fix cross-crate `impl Sized` & `impl ?Sized`
Previously, cross-crate impl-Trait (APIT, RPIT, etc.) that only consists of a single `Sized` bound (modulo outlives-bounds) and ones that are `?Sized` were incorrectly rendered. To give you a taste (before vs. after):
```diff
- fn sized(x: impl ) -> impl
+ fn sized(x: impl Sized) -> impl Sized
- fn sized_outlives<'a>(x: impl 'a) -> impl 'a
+ fn sized_outlives<'a>(x: impl Sized + 'a) -> impl Sized + 'a
- fn maybe_sized(x: &impl ) -> &impl
+ fn maybe_sized(x: &impl ?Sized) -> &impl ?Sized
- fn debug_maybe_sized(x: &impl Debug) -> &impl ?Sized + Debug
+ fn debug_maybe_sized(x: &(impl Debug + ?Sized)) -> &(impl Debug + ?Sized)
```
Moreover, we now surround impl-Trait that has multiple bounds with parentheses if they're the pointee of a reference or raw pointer type. This affects both local and cross-crate docs. The current output isn't correct (rustc would emit the error *ambiguous `+` in a type* if we fed the rendered code back to it).
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Best reviewed commit by commit :)
`@rustbot` label A-cross-crate-reexports
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rustdoc: render generic params & where-clauses of cross-crate assoc tys in impls
We used to only ever render generic parameters & where-clauses of cross-crate associated types when the item was located inside of a trait and we used to just drop them when it was inside of an impl block (trait or inherent).
Fixes #112904.
`@rustbot` label A-cross-crate-reexports
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blocks
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Filter away names that are not actually imported by the glob, e.g. because they are shadowed by something else
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