elaboration-zoo
rust
elaboration-zoo | rust | |
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23 | 2,683 | |
562 | 93,041 | |
- | 1.2% | |
5.3 | 10.0 | |
4 months ago | 2 days ago | |
Haskell | Rust | |
BSD 3-clause "New" or "Revised" License | GNU General Public License v3.0 or later |
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elaboration-zoo
- Dependent types do’s and don’ts
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How to implement dependent type theory I (2012)
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.
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How to implement dependent types in 80 lines of code
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)?
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.
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Online courses that use, but don't teach, Haskell?
If you're interested in dependent types, you might like András Kovács' elaboration zoo, which uses Haskell as the implementation language.
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A personal list of Rust grievances
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/
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Reference Implementation for MLF
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.
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purescript-backend-optimizer - A new optimization pipeline and modern-ES backend for PureScript.
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!
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Barebones lambda cube in OCaml
Highly recommend checking the first part of elaboration-zoo to see how all this might be implemented, it clears a lot of things up.
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Peridot MVP
Pattern unification
rust
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Create a Custom GitHub Action in Rust
If you haven't dipped your touch-typing fingers into Rust yet, you really owe it to yourself. Rust is a modern programming language with features that make it suitable not only for systems programming -- its original purpose, but just about any other environment, too; there are frameworks that let your build web services, web applications including user interfaces, software for embedded devices, machine learning solutions, and of course, command-line tools. Since a custom GitHub Action is essentially a command-line tool that interacts with the system through files and environment variables, Rust is perfectly suited for that as well.
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Why Does Windows Use Backslash as Path Separator?
Here's an example of someone citing a disagreement between CRT and shell32:
https://github.com/rust-lang/rust/issues/44650
This in addition to the Rust CVE mentioned elsewhere in the thread which was rooted in this issue:
https://blog.rust-lang.org/2024/04/09/cve-2024-24576.html
Here are some quick programs to test contrasting approaches. I don't have examples of inputs where they parse differently on hand right now, but I know they exist. This was also a problem that was frequently discussed internally when I worked at MSFT.
#include
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I hate Rust (programming language)
> instead of choosing a certain numbered version of the random library (if I remember correctly) I let cargo download the latest version which had a completely different API.
Yeah, they didn't follow the instructions and got burned. I still think that multiple things went wrong simultaneously for that experience. I wonder if more prevalent uses of `#[doc(alias = "name")]` being leveraged by https://github.com/rust-lang/rust/pull/120730 (which now that I check only accounts for methods and not functions, I should get on that!) so that when changing APIs around people at least get a slightly better experience.
- Rust Weird Exprs
- Critical safety flaw found in Rust on Windows (CVE-2024-24576)
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Unformat Rust code into perfect rectangles
Almost fixed the compiler: https://github.com/rust-lang/rust/pull/123325
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Implement React v18 from Scratch Using WASM and Rust - [1] Build the Project
Rust: A secure, efficient, and modern programming language (omitting ten thousand words). You can simply follow the installation instructions provided on the official website.
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Show HN: Fancy-ANSI – Small JavaScript library for converting ANSI to HTML
Recently did something similar in Rust but for generating SVGs. We've adopted it for snapshot testing of cargo and rustc's output. Don't have a good PR handy for showing Github's rendering of changes in the SVG (text, side-by-side, swiping) but https://github.com/rust-lang/rust/pull/121877/files has newly added SVGs.
To see what is supported, see the screenshot in the docs: https://docs.rs/anstyle-svg/latest/anstyle_svg/
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Upgrading Hundreds of Kubernetes Clusters
We strongly believe in Rust as a powerful language for building production-grade software, especially for systems like ours that run alongside Kubernetes.
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What Are Const Generics and How Are They Used in Rust?
The above Assert<{N % 2 == 1}> requires #![feature(generic_const_exprs)] and the nightly toolchain. See https://github.com/rust-lang/rust/issues/76560 for more info.
What are some alternatives?
StepULC - Efficient and single-steppable ULC evaluation algorithm
carbon-lang - Carbon Language's main repository: documents, design, implementation, and related tools. (NOTE: Carbon Language is experimental; see README)
pi-forall - A demo implementation of a simple dependently-typed language
zig - General-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
tinka
Nim - Nim is a statically typed compiled systems programming language. It combines successful concepts from mature languages like Python, Ada and Modula. Its design focuses on efficiency, expressiveness, and elegance (in that order of priority).
peridot - A fast functional language based on two level type theory
Odin - Odin Programming Language
higher-order-unification - A small implementation of higher-order unification
Elixir - Elixir is a dynamic, functional language for building scalable and maintainable applications
iterator_item - A syntax exploration of eventually stable Rust Iterator items
Rustup - The Rust toolchain installer