diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testNativeSetter.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testNativeSetter.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+function testNativeSetter() {
+    var re = /foo/;
+    var N = 19;
+    for (var i = 0; i < N; i++)
+        re.lastIndex = i;
+    assertEq(re.lastIndex, N - 1);
+}
+testNativeSetter();