This came up in some swissmap code.
Change-Id: I3c6705a5cafec8cb4953dfa9535cf0b45255cc83
Reviewed-on: https://go-review.googlesource.com/c/go/+/629516
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>