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// It?s treated like: var x = (y = 1); thus, ?y=1? creates an auto-global since there?s no binding ?var? statement for it. then that value gets copied into properly defined local var ?x?.

    (function(){
        var x = y = 1;
    })();
    alert(x); // undefined
    alert(y); // 1 -- oops, auto-global!