/*EXPECTED 1,2,3,1 */ class _Main { static function main(args : string[]) : void { var a1 = [ 1, 2, 3 ]; var a2 = [ a1[0] ]; // should not become Array.> var a3 = a1.concat(a2); // a1 and a2 are Array. log a3.join(","); } }