fix: Fix parsing of nested tuple field accesses in a cursed way

[Veykril]

This is absolutely terrible but seems to work. Macro fragment parsing comes next.

[cynecx]

Might be worth mentioning here I think, since I've implemented a similar but different approach (though still cursed) here: cynecx@3628848.
The basic idea is that the lexer produces three kind of FLOAT_NUMBER tokens: FLOAT_NUMBER (eg. -1.0), FLOAT_NUMBER_1 (eg. 1.) and FLOAT_NUMBER_2 (eg. 1.2). Then the parser can easily detect FLOAT_NUMBER_1 and FLOAT_NUMBER_2 and rewrite them, by injecting INT_NUMBER, DOT or INT_NUMBER, DOT, INT_NUMBER token sequences . This started as a more ambitious approach to generally support "injecting" tokens, however right now it's really limited to splitting floats. Also it's quite limited to non-macro usage right now.

[Veykril]

Ah right, I remember this now. At its core these two seem to be the same approach roughly, at least both look terrible :) Fixing up macros is somewhat annoying since you'll need to mutate the correct subtrees (aka we need something like a CursorMut ...).

I'm not sure if we need the hack for anything else though, so a general injection support might be too much? At least I am hopeful that the language doesn't give us more of this kind of ambiguity ...

[Veykril]

Turns out fixing up the inputs for macro expression fragments is a major PITA, so I skipped that for the time being as we aren't regressing on that side, just staying the same. Aside from that, things should just work. Assuming CI passes I'll try to merge it tonight or tomorrow so we can get some nightly testing in.

[Veykril]

Not too fond of the parser changes required to make this work, but it's not like we can do this without any awful hacks so....
let's see if this works out (I am a bit worried about parser recovery not playing nicewith this)
@bors r+

[bors]

📌 Commit a756c9a has been approved by Veykril

It is now in the queue for this repository.

[bors]

⌛ Testing commit a756c9a with merge 7f12344...

[bors]

☀️ Test successful - checks-actions
Approved by: Veykril
Pushing 7f12344 to master...