all: go fmt ./...

Make all our package sources use Go 1.17 gofmt format
(adding //go:build lines).

Not strictly necessary but will avoid spurious changes
as files are edited.

Part of //go:build change (#41184).
See https://golang.org/design/draft-gobuild

Change-Id: Ie3f0a5f80ab53b95a25db9ccfd9a3cc4ea7ff465
Reviewed-on: https://go-review.googlesource.com/c/sync/+/294370
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
diff --git a/semaphore/semaphore_bench_test.go b/semaphore/semaphore_bench_test.go
index f96d349..3b60ca8 100644
--- a/semaphore/semaphore_bench_test.go
+++ b/semaphore/semaphore_bench_test.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build go1.7
 // +build go1.7
 
 package semaphore_test
diff --git a/syncmap/go19.go b/syncmap/go19.go
index 41a5909..fa04dba 100644
--- a/syncmap/go19.go
+++ b/syncmap/go19.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build go1.9
 // +build go1.9
 
 package syncmap
diff --git a/syncmap/pre_go19.go b/syncmap/pre_go19.go
index 01a7be7..5bba413 100644
--- a/syncmap/pre_go19.go
+++ b/syncmap/pre_go19.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !go1.9
 // +build !go1.9
 
 package syncmap