rust-lang/rust — pull request #19777 by nikomatsakis (2014-12-12 16:41:59+00:00)
Title: Report an error when lifetime parameters are shadowed.

per rfc 459
cc https://github.com/rust-lang/rust/issues/19390

One question is: should we start by warning, and only switch to hard error later? I think we discussed something like this in the meeting.

r? @alexcrichton