Generics in associated types

[msiglreith]

Generics of associated types are removed by rustfmt.
The future is not stable but I think the syntax is already (?).

Before:

trait Foo<'a> {
    type Bar<'a>;
}

After:

trait Foo<'a> {
    type Bar;
}

https://play.rust-lang.org/?gist=e0614ea726bfdc99ea733ab96e724e0a&version=nightly&mode=debug&edition=2015

[topecongiro]

This seems to be a bug in rustc, the ast node does not contain the lifetime bounds.

[topecongiro]

Hmm, never mind: we were just ignoring it.