slices: add old build constraint syntax to help old go versions
When a project transitively depends on x/exp/slices,
go1.16 is confused and fails with errors like:
"//go:build comment without // +build comment"
Even when import of x/exp/slices guarded with build tags, so this
is imported only when compiling with go1.18, this error is unavoidable.
Let's wait a bit longer and help users who are stuck with old go.
Updates golang/go#51436
Change-Id: I7ba589644475f55585c11ba1f7650c5ede6bc637
Reviewed-on: https://go-review.googlesource.com/c/exp/+/448996
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
diff --git a/slices/slices_race_test.go b/slices/slices_race_test.go
index 5a2a15d..c85d6ee 100644
--- a/slices/slices_race_test.go
+++ b/slices/slices_race_test.go
@@ -3,6 +3,7 @@
// license that can be found in the LICENSE file.
//go:build race
+// +build race
package slices
