Cross-crate re-export produces invalid rustdoc for impl Trait

[fatemender]

In a cross-crate reexport of an impl Trait-accepting function, rustdoc formats it in a wrong way which is not even valid Rust.

Let crate1 be:

pub trait MyTrait {}
pub fn accepts_impl(_t: impl MyTrait) {}

Let crate2 be:

pub use crate1::{MyTrait, accepts_impl};

If we generate docs for crate2, we get this definition for the (re-exported) accepts_impl:

pub fn accepts_impl<impl MyTrait>(_t: impl MyTrait) 
where
    impl MyTrait: MyTrait, 

I see some similarities with #60113 here.
Both issues still reproduce on stable 1.36.0 and nightly bc2e84c.

[sinkuu]

#61613 should fix this problem.

[Disasm]

It seems this issue is no longer present.
rustc 1.41.0 (5e1a79984 2020-01-27)

[jyn514]

Closing since this was fixed by #61613