diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug670885.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug670885.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+// arr is an Int8Array, then changes to Int16Array.
+// This should trigger recompilation of f.
+var arr = new Int8Array(100);
+var arr16 = new Int16Array(100);
+arr16[2] = 12345;
+function f(a) {
+    var x;
+    for(var i=0; i<30; i++) {
+        x = a[2];
+    }
+    return x;
+}
+assertEq(f(arr), 0);
+assertEq(f(arr), 0);
+this.arr = arr16;
+assertEq(f(arr), 12345);