Support infix functions about alpaca

[yurrriq]

FWIW LFE uses #"" for binaries. Not sure if that'd be any good here.

[lepoetemaudit]

Good point - I missed those. I'll add - and ..

[j14159]

Thanks for digging into this! I'd like something different than b"" for binaries as they're not just strings (initial bad idea is b{} but that's kind of gross maybe?) but otherwise I think it'd be nice to have the opportunity to jettison the notion of bif function AST nodes entirely.

[j14159]

I think I'm getting hung up on overloading quotes for this but I don't have a particularly strong opinion and it's relatively easy to change I think so whatever works.

[lepoetemaudit]

What about triple angle brackets, i.e. <<< >>> - that keeps it closer to the original and it's easier to live losing that as a reserved symbol. It's true that the final decision can be postponed, though.

[j14159]

Doesn't bother me. Or use a prefix here too? Maybe # is not permitted as an operator and is reserved for prefixing other things, e.g. #{} for maps, #<<>> for binaries. Not entirely convinced of the aesthetics there, I'd say roll with what you think looks good for now and we can argue the looks later :)

[lepoetemaudit]

Definitely - I think the binary change is going to be the easier aspect anyway.

So far I've based the list of allowed operators on OCaml's: https://caml.inria.fr/pub/docs/manual-caml-light/node4.9.html - # is not among them so we would be safe using that. This is what I'm using to match the operators:

OP = [!\?=<>@\^\|&~\+\*/\$%]

[j14159]

OK, that suggests we'd still need some sort of BIFs for -, -., etc?