arena doesn't have to be explicitly initialized
arena doesn't have to be explicitly initialized

koba-e964/picrin,koba-e964/picrin,ktakashi/picrin,ktakashi/picrin,dcurrie/picrin,dcurrie/picrin,picrin-scheme/picrin,leavesbnw/picrin,leavesbnw/picrin,ktakashi/picrin,leavesbnw/picrin,koba-e964/picrin,omasanori/picrin,picrin-scheme/picrin,omasanori/picrin