mozilla/rust — pull request #13975 by nikomatsakis (2014-05-06 13:19:50+00:00)
Title: Tweak region inference to ignore constraints like `'a <= 'static`

Tweak region inference to ignore constraints like `'a <= 'static`, since they
have no value. This also ensures that we can handle some obscure cases of fn
subtyping with bound regions that we didn't used to handle correctly.

Fixes #13974.