1 files changed, 22 insertions, 0 deletions
diff --git a/vendor/github.com/go-errors/errors/error_backward.go b/vendor/github.com/go-errors/errors/error_backward.go
new file mode 100644
index 000000000..d7e09a824
--- /dev/null
+++ b/vendor/github.com/go-errors/errors/error_backward.go
@@ -0,0 +1,22 @@
+// +build !go1.13
+
+package errors
+
+// Is detects whether the error is equal to a given error. Errors
+// are considered equal by this function if they are the same object,
+// or if they both contain the same error inside an errors.Error.
+func Is(e error, original error) bool {
+	if e == original {
+		return true
+	}
+
+	if e, ok := e.(*Error); ok {
+		return Is(e.Err, original)
+	}
+
+	if original, ok := original.(*Error); ok {
+		return Is(e, original.Err)
+	}
+
+	return false
+}
+\ No newline at end of file