diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug648708.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug648708.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+thrown = false
+try {
+    ("".x = Object.seal)
+    "".x.valueOf();
+} catch (e) {thrown = true}
+assertEq(thrown, true);