1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/prototype/exec/failure-lastindex-access.js b/js/src/tests/test262/built-ins/RegExp/prototype/exec/failure-lastindex-access.js
new file mode 100644
index 0000000000..9925767e23
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/prototype/exec/failure-lastindex-access.js
@@ -0,0 +1,38 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: lastIndex is read but not written when global and sticky are unset.
+es6id: 21.2.5.2.2
+info: |
+    21.2.5.2.2 Runtime Semantics: RegExpBuiltinExec ( R, S )
+
+    4. Let lastIndex be ? ToLength(? Get(R, "lastIndex")).
+    [...]
+    8. If global is false and sticky is false, let lastIndex be 0.
+    [...]
+    12. Repeat, while matchSucceeded is false
+        [...]
+        c. If r is failure, then
+           i. If sticky is true, then
+              1. Perform ? Set(R, "lastIndex", 0, true).
+              2. Return null.
+---*/
+
+var gets = 0;
+var counter = {
+  valueOf: function() {
+    gets++;
+    return 0;
+  }
+};
+
+var r = /a/;
+r.lastIndex = counter;
+
+var result = r.exec('nbc');
+assert.sameValue(result, null);
+assert.sameValue(r.lastIndex, counter);
+assert.sameValue(gets, 1);
+
+reportCompare(0, 0);