(p)
const_value : INTCONSTANT
                   | DUBCONSTANT
                   | LITERAL
                   | BOOLCONSTANT
                   | const_list
                   | const_map
                   | const_ref
const_value : INTCONSTANT
                   | DUBCONSTANT
                   | LITERAL
                   | BOOLCONSTANT
                   | const_list
                   | const_map
                   | const_ref
const_value : INTCONSTANT | DUBCONSTANT | LITERAL | BOOLCONSTANT | const_list | const_map | const_ref
def p_const_value(p):
    '''const_value : INTCONSTANT
                   | DUBCONSTANT
                   | LITERAL
                   | BOOLCONSTANT
                   | const_list
                   | const_map
                   | const_ref'''
    p[0] = p[1]
def p_const_value ( p ) : p [ 0 ] = p [ 1 ]