Document does not show function return type which use keyword impl

[ZhouHansen]

My function is:

fn batcher() -> impl Fn(usize) -> () {
// ...
}

I run cargo doc --open, the document of this function lacks of return type:

pub fn batcher() -> 

cargo version: cargo 1.29.0-nightly

[GuillaumeGomez]

Shouldn't it be fixed by #53541? 😮

[ehuss]

The fix is not available until 1.30 (beta).