rustdoc regression: missing type parameters for impls of generic traits

[mbrubeck]

In the list of impls for a trait with type parameters, for example:

http://doc.rust-lang.org/nightly/std/convert/trait.AsRef.html#implementors

The impls currently appear like impl<T> AsRef for [T]

They should appear like impl<T> AsRef<[T]> for [T]

This is a regression from Rust 1.9 beta to Rust 1.10 nightly.

[alexcrichton]

cc @mitaa, ring any bells?

[ollie27]

It was caused by #32558, I'm working on a fix.

[alexcrichton]

Thanks @ollie27!