Function error

src/py_class/py_class_impl.py:643–647

(special_name, msg)

@special_method
def error(special_name, msg):
    print('''
    { { def %s $($tail:tt)* } $( $stuff:tt )* } => {
        $crate::py_error! { "%s" }
    };''' % (special_name, msg))

@special_method
def unimplemented(special_name):