diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/extensions/regress-bug629723.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/extensions/regress-bug629723.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+function f(foo) {
+    "use strict";
+    foo.bar;
+}
+
+var actual;
+try {
+    f();
+    actual = "no error";
+} catch (x) {
+    actual = (x instanceof TypeError) ? "type error" : "some other error";
+    actual += (/use strict/.test(x)) ? " with directive" : " without directive";
+}
+
+reportCompare("type error without directive", actual,
+              "decompiled expressions in error messages should not include directive prologues");