Version 4 generated with toolchain at commit 51012314.
Version 5 generated with toolchain at commit a6b16e00.

Change-Id: If11ec8b3357f0f71776c15665e4d5228b3842ff7
Reviewed-on: https://go-review.googlesource.com/41710
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>