rustdoc generates where clauses that are not valid Rust

[jimblandy]

At the moment, the summary for the IntoIterator trait definition reads:

pub trait IntoIterator where Self::IntoIter::Item == Self::Item {
    type Item;
    type IntoIter: Iterator;
    fn into_iter(self) -> Self::IntoIter;
}

The 'where' clause on the first line isn't valid Rust, which is confusing. It should instead be rendered the way it appears in the code:

pub trait IntoIterator {
    type Item;
    type IntoIter: Iterator<Item=Self::Item>;
    fn into_iter(self) -> Self::IntoIter;
}

(On #rust @alexcrichton said, "that's probably all located in https://github.com/rust-lang/rust/blob/master/src/librustdoc/clean/simplify.rs")

[steveklabnik]

Triage: no change. Still.

[Mark-Simulacrum]

Well, arguably, rustdoc is just ahead of it's time: #20041.

[steveklabnik]

Triage: no change, and 20041 hasn't landed yet.

[jyn514]

Duplicate of #77763 (I know this was filed earlier, but that issue has more details).