1 files changed, 18 insertions, 0 deletions
diff --git a/cmp/cmpopts/errors_xerrors.go b/cmp/cmpopts/errors_xerrors.go
new file mode 100644
index 0000000..6eeb8d6
--- /dev/null
+++ b/cmp/cmpopts/errors_xerrors.go
@@ -0,0 +1,18 @@
+// Copyright 2021, The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !go1.13
+
+// TODO(≥go1.13): For support on <go1.13, we use the xerrors package.
+// Drop this file when we no longer support older Go versions.
+
+package cmpopts
+
+import "golang.org/x/xerrors"
+
+func compareErrors(x, y interface{}) bool {
+	xe := x.(error)
+	ye := y.(error)
+	return xerrors.Is(xe, ye) || xerrors.Is(ye, xe)
+}