1 files changed, 13 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/guardproto-nursery.js b/js/src/jit-test/tests/warp/guardproto-nursery.js
new file mode 100644
index 0000000000..5093298e88
--- /dev/null
+++ b/js/src/jit-test/tests/warp/guardproto-nursery.js
@@ -0,0 +1,13 @@
+function f() {
+    var o = {x: 1, y: 3};
+    o.__proto__ = {x: 2};
+    var p = Math;
+    p.__proto__ = o;
+    p.__proto__ = {__proto__: o};
+
+    for (var i = 0; i < 3000; i++) {
+        assertEq(p.x, 1);
+        assertEq(p.y, 3);
+    }
+}
+f();