1 files changed, 13 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/auto-regress/bug672104.js b/js/src/jit-test/tests/auto-regress/bug672104.js
new file mode 100644
index 000000000..1150ee42b
--- /dev/null
+++ b/js/src/jit-test/tests/auto-regress/bug672104.js
@@ -0,0 +1,13 @@
+// Binary: cache/js-dbg-64-a37127f33d22-linux
+// Flags: -m -n
+//
+load(libdir + "immutable-prototype.js");
+
+a = {};
+b = __proto__;
+for (i = 0; i < 9; i++) {
+    if (globalPrototypeChainIsMutable()) {
+        __proto__ = a;
+        a.__proto__ = b
+    }
+}