Lifetime generics are being omitted in rustdoc output

[chris-morgan]

IndexMut docs:

pub trait IndexMut<Index, Result> {
    fn index_mut(&'a mut self, index: &Index) -> &'a mut Result;
}

But this is what the code says:

pub trait IndexMut<Index, Result> {
    fn index_mut<'a>(&'a mut self, index: &Index) -> &'a mut Result;
}

What happened to the <'a>? We need it for clarity!

[steveklabnik]

These aren't 'generics', but yeah, this is a bug for sure.

[chris-morgan]

They may not be 'generics' (whatever you mean by that) but they are generics—just generic lifetime parameters rather than generic type parameters.

[sfackler]

Dup of #14462

[chris-morgan]

Dunno quite how I managed to miss that one…