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Lawrence Bethlenfalvy
2023-05-17 16:16:11 +01:00
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notes/papers/report/parts/haskell.md
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@@ -6,14 +6,10 @@ In addition the handling of all syntax sugar is delegated to the compiler. This
**Syntax-level metaprogramming:** [Template Haskell][th1] is Haskell's tool for syntax-level macros. I learned about it after I built Orchid, and it addresses a lot of my problems.
[th1]: https://wiki.haskell.org/Template_Haskell
[th1]: ./literature/macros.md
**Type system:** Haskell's type system is very powerful but to be able to represent some really interesting structures it requires a long list of GHC extensions to be enabled which in turn make typeclass implementation matching undecidable and the heuristic rather bad (understandably so, it was clearly not designed for that; it wasn't really even designed to be a heuristic).
**Type system:** Haskell's type system is very powerful but to be able to represent some really interesting structures it requires a long list of GHC extensions to be enabled which in turn make typeclass implementation matching undecidable and the heuristic rather bad (understandably so, it was clearly not designed for that).
My plan for Orchid was to use Orchid itself as a type system as well; rather than aiming for a decidable type system and then extending it until it [inevitably][tc1] [becomes][tc2] [turing-complete][tc3], my type-system would be undecidable from the start and progress would point towards improving the type checker to recognize more and more cases.
[tc1]: https://en.cppreference.com/w/cpp/language/template_metaprogramming
[tc2]: https://blog.rust-lang.org/2022/10/28/gats-stabilization.html
[tc3]: https://wiki.haskell.org/Type_SK
My plan for Orchid was to use Orchid itself as a type system as well; rather than aiming for a decidable type system and then extending it until it inevitably becomes turing-complete [1][2][3], my type-system would be undecidable from the start and progress would point towards improving the type checker to recognize more and more cases.
A description of the planned type system is available in [[type_system/+index|Appendix T]]