program : (newline) statement
                   | program statement

def program(self):
        """program : (newline) statement
                   | program statement
        """
        statements = []
        if self.cur_token.type == TokenTypes.NEW_LINE:
            self.eat(TokenTypes.NEW_LINE)
        while self.cur_token.type != TokenTypes.EOF:
            statements += [self.statement()]
        return Block(statements)