rust-lang/rust — pull request #18749 by nikomatsakis (2014-11-07 21:15:48+00:00)
Title: Treat builtin bounds like all other kinds of trait matches.

Treat builtin bounds like all other kinds of trait matches. Introduce a simple hashset in the fulfillment context to catch cases where we register the exact same obligation twice. This helps prevent duplicate error reports but also handles the recursive obligations created by builtin bounds.

r? @pcwalton
cc @FlaPer87