--- /dev/null
+function shouldBe(actual, expected) {
+ if (actual !== expected)
+ throw new Error('bad value: ' + actual);
+}
+var exec = RegExp.prototype.exec;
+var nested = Object.create(RegExp.prototype);
+
+nested.exec = "Hello";
+shouldBe(nested.hasOwnProperty('exec'), true);
+shouldBe(nested.exec, "Hello");
+shouldBe(/hello/.exec, exec);