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I'm convinced nobody actually uses parser generators in Rust:
* pomelo can't generate lexer (understandable, as it is a port of lemon and lemon can't do this either)
* pest can't do parse actions, you have to convert your parse tree to ast manually
* lalrpop can't do comments
* and the day I wrote the line above it can
* reports parsing errors as byte offsets
* if you want to skip parsing one of the alternatives functional design gets quite awkward
* antlr4rust is untried and requires java to build
* no library supports island grammars
What to emit?
* SPIR-V
* Better library support, easier to emit
* Can by optimized by IGC
* Can't do some things (not sure what exactly yet)
* But we can work around things with inline VISA
* VISA
* Quicker compilation
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