mozilla/rust — pull request #3854 by nikomatsakis (2012-10-24 21:06:46+00:00)
Title: Issue 2263 fn subtyping

r? @brson

This is a partial fix for #2263. It corrects subtyping for function types with bound lifetimes, but not LUB/GLB. The description in the comment in region_inference.rs (included in the patch) explains the situation as best I can, it's a fairly subtle problem, I won't repeat it here.