diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug550210.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug550210.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+function g(e) {
+    return ("" + e);
+}
+
+function blah() {
+    do {
+        yield;
+    } while ({}(p = arguments));
+}
+rv = blah();
+try {
+    for (a in rv) ;
+} catch (e) {
+    print("" + g(e));
+}
+gc();