code: def p_expression_cond(self, p):
          'expression : expression COND expression COLON expression'
          p[0] = Cond(p[1], p[3], p[5], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_expression_cond(self, p):
          'expression : expression COND expression COLON expression'
          p[0] = Cond(p[1], p[3], p[5], lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: expression : expression COND expression COLON expression