diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug621522.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug621522.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+
+/* Don't crash. */
+function f() {
+    var x;
+    x.a;
+    x = {};
+}
+
+try {
+    f();
+    assertEq(0, 1);
+} catch(e) {
+
+}