1 files changed, 20 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/regress/regress-801171.js b/deps/v8/test/mjsunit/regress/regress-801171.js
new file mode 100644
index 0000000000..4bd85eeafc
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-801171.js
@@ -0,0 +1,20 @@
+// Copyright 2018 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.
+
+let called_custom_unicode_getter = false;
+const re = /./;
+
+function f() {
+  re.__defineGetter__("unicode", function() {
+    called_custom_unicode_getter = true;
+  });
+  return 2;
+}
+
+assertEquals(["","",], re[Symbol.split]("abc", { valueOf: f }));
+
+// The spec mandates retrieving the regexp instance's flags before
+// ToUint(limit), i.e. the unicode getter must still be unmodified when
+// flags are retrieved.
+assertFalse(called_custom_unicode_getter);