michael@0: function testArrayInWithIndexedProto()
michael@0: {
michael@0:     Array.prototype[0] = "Got me";
michael@0:     var zeroPresent, zeroPresent2;
michael@0:     // Need to go to 18 because in the failure mode this is
michael@0:     // testing we have various side-exits in there due to interp and
michael@0:     // tracer not agreeing that confuse the issue and cause us to not
michael@0:     // hit the bad case within 9 iterations.
michael@0:     for (var j = 0; j < 18; ++j) {
michael@0: 	zeroPresent = 0 in [];
michael@0:     }
michael@0: 
michael@0:     var arr = [1, 2];
michael@0:     delete arr[0];
michael@0:     for (var j = 0; j < 18; ++j) {
michael@0: 	zeroPresent2 = 0 in arr;
michael@0:     }
michael@0:     return [zeroPresent, zeroPresent2];
michael@0: }
michael@0: 
michael@0: var [ret, ret2] = testArrayInWithIndexedProto();
michael@0: assertEq(ret, true);
michael@0: assertEq(ret2, true);
michael@0: