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function fna() {}
fna.prototype = undefined;
new fna;
function fnb() {}
fnb.prototype = null;
new fnb;
function fnc() {}
fnc.prototype = 3;
new fnc;
function fnd() {}
fnd.prototype = true;
new fnd;
function fne() {}
fne.prototype = "foo";
new fne;
function fnf() {}
fnf.prototype = /foo/;
new fnf;