more detail error message on car/cdr error
more detail error message on car/cdr error

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