diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug657198.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug657198.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+// |jit-test| slow;
+
+// Binary: cache/js-dbg-32-599d1c6cba63-linux
+// Flags: -j
+//
+eval("")
+o15 = {}
+function f11(o) {
+    props = Object.getOwnPropertyNames(o)
+    prop = props.length ? prop[prop.e] + "" : ""
+    o[prop] = 3
+}
+function f12(o) {
+    _someglobal_ = o;
+    for (j = 0; j < 5; j++) {
+        for (x in {
+            x: {
+                x: function() {
+                    return _someglobal_
+                }
+            }.x()
+        }.x) {
+            ({
+                x: {
+                    x: function() {}
+                }.x()
+            }[x])
+        }
+        gc()
+    }
+} {
+    for (i = 0; i < 100; i++) {
+        f12(o15)
+        f11(o15)
+    }
+}