Change-Id: I64645fef0ffd1cea7c7710ec974520f85e0f7496
Reviewed-on: https://go-review.googlesource.com/c/go/+/539579


Run-TryBot: shuang cui <imcusg@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>