codereview: fix for Mercurial 2.1
codereview: fix for Mercurial 2.1

Mercurial: the Python of version control systems.
Python: the Mercurial of programming languages.

R=golang-dev, bradfitz
CC=golang-dev
http://codereview.appspot.com/5777066

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang