(p)
function_seq : function sep function_seq
                    | function function_seq
                    |
function_seq : function sep function_seq
                    | function function_seq
                    |
function_seq : function sep function_seq | function function_seq |
def p_function_seq(p):
    '''function_seq : function sep function_seq
                    | function function_seq
                    |'''
    _parse_seq(p)
def p_function_seq ( p ) : _parse_seq ( p )