Lifetime declaration missing in cross-crate method definitions

[huonw]

http://doc.rust-lang.org/nightly/std/ops/trait.Index.html#method.index

    fn index(&'a self, index: &Index) -> &'a <Self as Index<Index>>::Output;

vs.

http://doc.rust-lang.org/nightly/core/ops/trait.Index.html#method.index

    fn index<'a>(&'a self, index: &Index) -> &'a Output;

---

http://doc.rust-lang.org/nightly/std/collections/struct.BTreeMap.html#method.keys

    fn keys(&'a self) -> Keys<'a, K, V>

vs.

http://doc.rust-lang.org/nightly/collections/struct.BTreeMap.html#method.keys

    fn keys<'a>(&'a self) -> Keys<'a, K, V>

[tomjakubowski]

It doesn't look like the ty::Generics gets includes any region parameters unless a type parameter is bound by them (like <'a, T: 'a>). Might be an encoder bug?

edit: oh, I see, bare fn types have Binders full of lifetimes in their signature.

[alexcrichton]

Closing as a dupe of #14462