1 files changed, 10 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/bug642248.js b/js/src/jit-test/tests/basic/bug642248.js
new file mode 100644
index 0000000000..8c37b76759
--- /dev/null
+++ b/js/src/jit-test/tests/basic/bug642248.js
@@ -0,0 +1,10 @@
+function test(makeNonArray) {
+    function C() {}
+    C.prototype = []
+    c = new C();
+    c.push("foo");
+    return c.length
+}
+assertEq(test(true), 1);
+var a = [];
+var b = Object.create(a);