From comment at @santsai at https://github.com/golang/go/issues/24137#issuecomment-452983000

Change-Id: Icf0aff2172811752b240d94e709550b0da353360
Reviewed-on: https://go-review.googlesource.com/c/157378
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: JBD <jbd@google.com>