diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug739901.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug739901.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+// Binary: cache/js-dbg-64-940078281bbf-linux
+// Flags: --ion-eager
+//
+function List(l) {
+  this.l = l;
+}
+function f(p) {
+  return g(p.l);
+};
+function g(p) {
+  return !(p instanceof List) ? null : f(p.l);
+};
+list =
+  new List(new List(
+    new List(new List(
+      new List(new List(
+        new List(new List(null))))))))
+for (let i = 0; i < 99999; i++) {
+  g(list);
+}