Wasn't convenient enough.

Change-Id: I78270dc22cdb2e264641148e50029a9e4de953cd
Reviewed-on: https://go-review.googlesource.com/30251
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>