1 files changed, 17 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/jaeger/propertyOptimize-4.js b/js/src/jit-test/tests/jaeger/propertyOptimize-4.js
new file mode 100644
index 000000000..942474875
--- /dev/null
+++ b/js/src/jit-test/tests/jaeger/propertyOptimize-4.js
@@ -0,0 +1,17 @@
+// Make sure new script properties can be invalidated on specialized prototype
+// types while they are still being constructed.
+
+function Foo(a, b, c) {
+  this.x = a + b;
+  this.y = c;
+}
+
+updated = false;
+var o = {valueOf: function() {
+    Object.defineProperty(Object.prototype, 'y', {set:function() { updated = true; }})
+  }};
+
+function Bar() {}
+Bar.prototype = new Foo(o, 1, 2);
+assertEq(updated, true);
+assertEq(Bar.prototype.y, undefined);