diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug723271.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug723271.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+function addConstraint(blaat) {
+    return blaat.v1
+}
+
+function ScaleConstraint() {
+    this.direction = null
+    this.v1 = {};
+    addConstraint(this);
+}
+
+function EqualityConstraint() {
+    this.v1 = {};
+    addConstraint(this);
+}
+
+function deltaBlue() {
+    new EqualityConstraint();
+    new ScaleConstraint();
+}
+
+for (var n = 0; n<100; n++) {
+    deltaBlue()
+}