diff --git a/vendor/golang.org/x/text/secure/bidirule/bidirule9.0.0.go b/vendor/golang.org/x/text/secure/bidirule/bidirule9.0.0.go
new file mode 100644
index 0000000..bb0a920
--- /dev/null
+++ b/vendor/golang.org/x/text/secure/bidirule/bidirule9.0.0.go
@@ -0,0 +1,15 @@
+// Copyright 2016 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.
+
+//go:build !go1.10
+// +build !go1.10
+
+package bidirule
+
+func (t *Transformer) isFinal() bool {
+	if !t.isRTL() {
+		return true
+	}
+	return t.state == ruleLTRFinal || t.state == ruleRTLFinal || t.state == ruleInitial
+}