rust-lang/rust — pull request #16424 by pcwalton (2014-08-11 18:21:22+00:00)
Title: librustc: Implement simple `where` clauses.

These `where` clauses are accepted everywhere generics are currently
accepted and desugar during type collection to the type parameter bounds
we have today.

A new keyword, `where`, has been added. Therefore, this is a breaking
change. Change uses of `where` to other identifiers.

[breaking-change]

r? @nikomatsakis (or whoever)