diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testFloatArrayIndex.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testFloatArrayIndex.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function testFloatArrayIndex() {
+    var a = [];
+    for (var i = 0; i < 10; ++i) {
+        a[3] = 5;
+        a[3.5] = 7;
+    }
+    return a[3] + "," + a[3.5];
+}
+assertEq(testFloatArrayIndex(), "5,7");