1 files changed, 14 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/teleporting-mutable-proto.js b/js/src/jit-test/tests/basic/teleporting-mutable-proto.js
new file mode 100644
index 000000000..c9bfd7f28
--- /dev/null
+++ b/js/src/jit-test/tests/basic/teleporting-mutable-proto.js
@@ -0,0 +1,14 @@
+var A = {x: 3};
+var B = Object.create(A);
+var C = Object.create(B);
+var D = Object.create(C);
+
+function f() {
+    for (var i=0; i<30; i++) {
+	assertEq(D.x, (i <= 20) ? 3 : 10);
+	if (i === 20) {
+	    C.__proto__ = {x: 10};
+	}
+    }
+}
+f();