(p)
definition_type : base_type
                       | container_type
definition_type : base_type
                       | container_type
definition_type : base_type | container_type
def p_definition_type(p):
    '''definition_type : base_type
                       | container_type'''
    p[0] = p[1]
def p_definition_type ( p ) : p [ 0 ] = p [ 1 ]