diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug732863.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug732863.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+// Compiled
+function TestCase(a) { }
+
+// Not compiled (try)
+function reportCompare (actual) {
+  TestCase(actual);
+  try   {  }  catch(ex)  {  }
+}
+
+// Compiled
+function addThis(bound) {
+    actualvalues[bound] = undefined + actual;
+    reportCompare(actualvalues[bound]);
+}
+
+var actual = '';
+var actualvalues = [];
+addThis(0);
+actual = NaN;
+addThis(1);