Fix quote! parsing of punctuations such as `?;` about rune HOT 8 OPEN

Could you elaborate? I don't understand what this issue relates to.

from rune.

quote!(something?;) throws this error.

from rune.

Can you reproduce the exact error here for reference?

from rune.

error: unsupported punctuation
  --> src/env.rs:47:30
   |
47 |         rune::macros::quote!(?;);
   |                              ^

from rune.

I expect the reason is that quote parses all punctuation that is Spacing::Joint as one tt, but it should be two in this case.

from rune.

Right, so yeah, it's an error we raise:

from rune.

So a way to do this would be to improve kind_from_punct to process more than one punctuation in case it's a joint composite which can actually be decomposed into multiple punctuations. Since both ? and ; are already separate punctuations.

from rune.

I have a list of the conditions to parse rust tts from joint tokens here:
https://github.com/ModProg/proc-macro-utils/blob/196525b066a3b5f8d751da6e7574731790827bb3/src/parser.rs#L1047

from rune.