don't do pop_try when an error was raised
don't do pop_try when an error was raised

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