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var x = 42;
function f() {
var a = [new Date, new Date, new Date, new Date, new Date];
for (var i = 0; i < 5; i++)
a[i].m = function () {return x};
for (i = 0; i < 4; i++)
if (a[i].m == a[i+1].m)
throw "FAIL!";
}
f();