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Re: [C++ PATCH] Make parser revert digraph "<:"
Gabriel Dos Reis wrote:
>> That being said, for the problem at hand it might be an overkill and
>> the scheme has also to be tested when there are other syntax errors
>> further in the program.
>
> For the problem at hand, we know what the value of the token is. It
> is the value of the token '['. The issue is to determine whether it
> was spelt '[' or '<:' for diagnostic purpose only. So, it is not a
> case where we really have a tentative parsing.
No, it's not only a diagnostic issue. If you check my patch, I emit a
diagnostic only to be fully ISO compliant. If you comment the errors out, my
code makes the parser accept "A<::B>" without whitespaces and go on with the
compilation correctly. I use tentative parsing to achieve this.
This is why I keep stressing the fact that checking if there actually was a
digraph is not going to help that much.
Giovanni Bajo