private Token _Consume(TokenKind kind)
{
Token old = _Current;
_Current = _Lexer.Next();
if (old.TokenKind != kind)
throw new ParseException("意外的 Token：" + _Current.TokenKind.ToString() + "。未找到：" + kind, _Current.Line, _Current.Col);
return old;
}
private Token _Consume()
{
Token old = _Current;
_Current = _Lexer.Next();
return old;
}