fix not-implemented errors
fix not-implemented errors

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