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-rw-r--r--cmp/cmpopts/errors_xerrors.go1
1 files changed, 1 insertions, 0 deletions
diff --git a/cmp/cmpopts/errors_xerrors.go b/cmp/cmpopts/errors_xerrors.go
index 6eeb8d6..60b0727 100644
--- a/cmp/cmpopts/errors_xerrors.go
+++ b/cmp/cmpopts/errors_xerrors.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 !go1.13
// +build !go1.13
// TODO(≥go1.13): For support on <go1.13, we use the xerrors package.