1 files changed, 23 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/regress/regress-crbug-772689.js b/deps/v8/test/mjsunit/regress/regress-crbug-772689.js
new file mode 100644
index 0000000000..32e220daa7
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-crbug-772689.js
@@ -0,0 +1,23 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+const A = class A extends Array {
+  constructor() {
+    super();
+    this.y = 1;
+  }
+}
+
+function foo(x) {
+  var a = new A();
+  if (x) return a.y;
+}
+
+assertEquals(undefined, foo(false));
+assertEquals(undefined, foo(false));
+%OptimizeFunctionOnNextCall(foo);
+assertEquals(undefined, foo(false));
+assertEquals(1, foo(true));