diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/regexpLastIndex.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/regexpLastIndex.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+function regexpLastIndex()
+{
+    var n = 0;
+    var re = /hi/g;
+    var ss = " hi hi hi hi hi hi hi hi hi hi";
+    for (var i = 0; i < 10; i++) {
+        // re.exec(ss);
+        n += (re.lastIndex > 0) ? 3 : 0;
+        re.lastIndex = 0;
+    }
+    return n;
+}
+assertEq(regexpLastIndex(), 0);