CONTRIBUTORS: Andrea Spadaccini (Google CLA)
CONTRIBUTORS: Andrea Spadaccini (Google CLA)

R=golang-dev, rsc
CC=golang-dev, spadaccio
http://codereview.appspot.com/5460046

wesolows/golang,wesolows/golang,wesolows/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,wesolows/golang