mozilla/rust — pull request #6373 by nikomatsakis (2013-05-09 20:00:52+00:00)
Title: Issue 6355 perf regression

Fix #6355 and #6272---we were not giving the correct index to the derefs that occur as part of the rooting process, resulting in extra copies and generally bogus behavior. Haven't quite produced the right test for this, but I thought I'd push the fix in the meantime. Test will follow shortly.

r? @graydon