append returns '() when given no args
append returns '() when given no args

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