docs: def p_multiplicative_expr(self, p):
          """multiplicative_expr : unary_expr
                                 | multiplicative_expr MULT unary_expr
                                 | multiplicative_expr DIV unary_expr
                                 | multiplicative_expr MOD unary_expr
          """
          if len(p) == 2:
              p[0] = p[1]
          else:
              p[0] = self.asttypes.BinOp(op=p[2], left=p[1], right=p[3])
              p[0].setpos(p, 2)