1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/prototype/exec/success-lastindex-access.js b/js/src/tests/test262/built-ins/RegExp/prototype/exec/success-lastindex-access.js
new file mode 100644
index 0000000000..30f3c62d3f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/prototype/exec/success-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 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")).
+    5. Let flags be R.[[OriginalFlags]].
+    6. If flags contains "g", let global be true, else let global be false.
+    [...]
+    15. If global is true or sticky is true, then
+        a. Perform ? Set(R, "lastIndex", e, true).
+---*/
+
+var gets = 0;
+var counter = {
+  valueOf: function() {
+    gets++;
+    return 0;
+  }
+};
+
+var r = /./;
+r.lastIndex = counter;
+
+var result = r.exec('abc');
+
+assert.notSameValue(result, null);
+assert.sameValue(result.length, 1);
+assert.sameValue(result[0], 'a');
+assert.sameValue(r.lastIndex, counter);
+assert.sameValue(gets, 1);
+
+reportCompare(0, 0);