test for append() built-in
test for append() built-in

R=r, rsc
CC=golang-dev
http://codereview.appspot.com/2777041

Committer: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go