Updates #14664

Change-Id: I1f7b1116cfe91466816c760f136ce566da3e80a9
Reviewed-on: https://go-review.googlesource.com/24340
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>