This was released in 1.21, release noted in CL 524675.
(I think it was missed originally and then and backported,
but then somehow incorrectly made it into the 1.22 dragnet.)
Change-Id: I45f3182f14f77f8b92a3b7d5ef0011b71fd3c176
Reviewed-on: https://go-review.googlesource.com/c/go/+/546675 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Keith Randall <khr@google.com>
TryBot-Bypass: Keith Randall <khr@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>