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function testObjectVsPrototype() {
function D() {}
var b = D.prototype = {x: 1};
var d = new D;
var arr = [b, b, b, d];
for (var i = 0; i < 4; i++)
arr[i].x = i;
d.y = 12;
assertEq(d.x, 3);
}
testObjectVsPrototype();