Elaboration-zoo Alternatives

elaboration-zoo reviews and mentions

• Dependent types do’s and don’ts
  1 project | /r/ProgrammingLanguages | 19 Jun 2023
• How to implement dependent type theory I (2012)
  3 projects | news.ycombinator.com | 14 Jun 2023

  I've noticed amongst many peers that when going down the type theory/pl theory journey there is a ton of hidden knowledge and context we all find ourselves collecting.

  All of this knowledge and context spread amongst a common set of books, papers, blog posts, and git repos floating around the internet.

  At the risk of creating yet another partial silo, I decided earlier this year to create a project similar to the [Elaboration Zoo](https://github.com/AndrasKovacs/elaboration-zoo) but focused on a blessed path to MLTT with a number of the desirable language features via bidirectional typechecking.

  https://github.com/solomon-b/lambda-calculus-hs

  The project is incomplete and my end goal is a website like the [1 Lab](https://1lab.dev) but focused on Type Theory and PL Theory, but I ran low on steam and could use some collaborators.

• How to implement dependent types in 80 lines of code
  3 projects | /r/ProgrammingLanguages | 25 Feb 2023

  Thanks, yeah, I haven't benchmarked the implementation yet, and I see the repeated substitution happening. Would the NbE approach where we have indices for terms and levels for values fix the issue (I believe you wrote the implementation here)?

  1 project | /r/functionalprogramming | 25 Feb 2023

  I find the NbE approach that combines both indices and levels quite appealing. You remain first-order (easier for debugging and etc.), but no need to define substitution now.

• Online courses that use, but don't teach, Haskell?
  2 projects | /r/haskell | 20 Nov 2022

  If you're interested in dependent types, you might like András Kovács' elaboration zoo, which uses Haskell as the implementation language.

• A personal list of Rust grievances
  11 projects | news.ycombinator.com | 12 Sep 2022

  I think it's more a reflection of how Rust evolved, and the techniques and approaches known and understood at the time and the strangeness budget they were (understandably) willing to take on at the time as opposed to something inherent. And also sometimes having separate, complicated features for similar things (as opposed to simple features that compose powerfully) can be useful pedagogically as well.

  At any rate, this is something I'm interested in, and so that's why it appears so high up on my list. Often you really do want sub-languages for different purposes, but managing how they interact and work together, what is the same and what is different, and how that impacts usability is interesting (and difficult) part. I feel like it should be possible to do this, but it's going to take some work and there's still lots of unknowns.

  In technical terms, I'm interested in dependently typed module systems, multistage programming[1], graded modal type theory[2], elaborator reflection, and two level type theory[3]. These all sound pretty intimidating, but you can actually see glimmers of some of this stuff in how Zig handles type parameters and modules, for example, something that most programmers really like the first time they see it!

  I do feel like there is the core of a simple, flexible, powerful systems language out there... but finding it, and making it approachable while maintaining a solid footing in the theory and being sensitive to the practical demands of systems programming is a nontrivial task, and many people will be understandably skeptical that this is even a good direction to pursue. Thankfully the barrier to entry for programming language designers to implementing languages in this style has reduced significantly in just the last number of years[4], so I have hope that we might see some interesting stuff in the coming decade or so. In the meantime we have Rust as well, which is still an excellent language. I'm just one of those people who's never content with the status quo, always wishing we can push the state of the art further. This is why I got excited by Rust in the first place! :)

  [1]: https://github.com/metaocaml/metaocaml-bibliography

  [2]: https://granule-project.github.io/

  [3]: https://github.com/AndrasKovacs/staged

  [4]: https://github.com/AndrasKovacs/elaboration-zoo/

• Reference Implementation for MLF
  1 project | /r/ProgrammingLanguages | 29 Aug 2022

  Another option is this algorithm by Andras Kovacs dubbed "Dynamic order elaboration": https://github.com/AndrasKovacs/elaboration-zoo/tree/master/06-first-class-poly . Basically if you are checking a term against a bare meta variable, then postpone the checking until the meta variable has a solution.

• purescript-backend-optimizer - A new optimization pipeline and modern-ES backend for PureScript.
  2 projects | /r/haskell | 25 Aug 2022

  Special shout out to /u/AndrasKovacs and elaboration-zoo (as well as their various NbE notes) which served as a primary inspiration for the architecture. Can't thank you enough for those resources!

• Barebones lambda cube in OCaml
  1 project | /r/ProgrammingLanguages | 16 Aug 2022

  Highly recommend checking the first part of elaboration-zoo to see how all this might be implemented, it clears a lot of things up.

• Peridot MVP
  2 projects | /r/ProgrammingLanguages | 8 Aug 2022

  Pattern unification

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