- Document the semantics of the DSL!
- Clean up and factor the codegen properly.
- Get rid of the expression syntax `<EXPR` in patterns; do a type-dependent
parse instead where we know the polarity of pattern-term args and parse
in-args as exprs.
- Look into whether optimizations are possible:
- More in-depth fallibility analysis (avoid failure edges where possible)
- Slightly nicer human-readable generated code
- Include full rule body (S-expression) in comment, not just line number
- Inline some expressions (no more `let val23 = 1234; ... f(val23);`)
- Build inlining and simplification: inline invocations of internal
constructors, and eliminate ctor-etor or makevariant-matchvariant pairs.
- Ideas from discussion with fitzgen
- Turn arg-polarity and exprs on extractors into purer "InstFormat"
- Emit two contexts: an immutable context for inputs and a mutable context for
outputs
