letlang
prusti-dev
letlang | prusti-dev | |
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12 | 23 | |
157 | 1,488 | |
- | 1.5% | |
7.9 | 8.3 | |
4 months ago | 27 days ago | |
Rust | Rust | |
MIT License | GNU General Public License v3.0 or later |
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letlang
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Letlang — Roadblocks and how to overcome them - My programming language targeting Rust
That works for any types (except the functional types), and even the generic ones. During code generation, I create structs that implement the Type trait.
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A new milestone for Letlang (targeting Rust) - Effect Handlers
As stated on the website ( https://letlang.dev ), Letlang is a general-purpose language.
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Writing a simple Lisp interpreter in Rust
Author here, the article is more about how Rust and its ecosystem are nice tools for language designers rather than the beauty of Lisp.
The crates listed in that article are the ones I use for my compiler: https://letlang.dev
Lisp was only chosen as a way to demonstrate the power of those crates and Rust features. A kind of way of justifying my choices for Letlang.
It's not "you should do it like this" but "you can do it like this".
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Ask HN: Possible? Faster than C, simpler than Python, safer than Rust
"Faster than C", I saw people write C code slower than a Python equivalent. So I have to admit, I don't know what it means for a language to be fast, because it depends on the algorithm being implemented.
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"simpler than Python", what does "simple" mean?
Simple design? Python's design is very complex (take a look at "Crimes with Python's pattern matching" < https://www.hillelwayne.com/post/python-abc/ > for example), on the other hand, assembly languages, or Lisp, or Forth, have a very simple design.
Simple as in "easy to use"? Rust is easy, write code, fix what the compiler tells you you did wrong. Joke aside, Go is quite easy to use and while I personally don't like this language, I get why it replaced Python in a lot of use cases.
Also, once you get used to the OTP framework, Erlang/Elixir/Gleam/any beam language are quite easy to use and have less footguns than Python.
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"safer than Rust" is too vague. Is it memory safety? type safety? thread safety? cosmic ray safety? A mix of all of that?
Let's guess you meant "memory safety". All languages with a Garbage Collector are "memory safe".
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On a semi-unrelated note, I've been working on https://letlang.dev
It's a language inspired by Erlang/Elixir (same concurrency model) that compiles to Rust code (the runtime use tokio). It is immutable, have no Garbage Collector thanks to Rust semantics, and dynamically typed.
I haven't run any benchmark (it's not even finished, I've been working on the specification before continuing the implementation), but I guess it could be slower than a rock.
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For some recommendations, have you looked at Zig? Nim? Hare?
https://ziglang.org/
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Syntax for defining algebraic data types
In my language (Letlang), I use the keyword class with structural pattern matching and optionally a predicate. Types (or rather, classes) can be combined with logical operators &, |, !:
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Erlang's not about lightweight processes and message passing
Not sure this is what GP is talking about but to implement the actor model in https://letlang.dev I use tokio.
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Features you've removed from your lang? Why did you put them in, why did you take them out?
In the early drafts of Letlang, I had the goal to add an equation solver. I got rid of that because:
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What features would you want in a new programming language?
I'm working on a programming language inspired by erlang and which compiles to Rust: https://letlang.dev
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Six programming languages I’d like to see
For a contract based language and a "really dynamically typed language", I'm working on https://letlang.dev
And it's because I haven't thought yet about how to do static type checking with such a feature.
I haven't got any time to work on it in the past few weeks, and I'm the only dev (would really love some help). So, it will be ready when it will be ready :P
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Hello Letlang! My programming language targeting Rust
I use Rust generators to implement them, a rudimentary example: https://github.com/linkdd/letlang/blob/main/letlang_runtime/src/utils/entrypoint.rs
prusti-dev
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Using_Prolog_as_the_AST
> The overall goal would be to figure out classical error conditions like nill pointers deference.
> If I can figure out if a pointer will be nil in some execution branch, there is no reason why a computer cannot do the same.
Note, this is called flow-sensitive typing (also called type narrowing) and I think that typescript does it.
https://en.wikipedia.org/wiki/Flow-sensitive_typing
> I personally would see this as an human race level upgrades. Imagine feeding your code to a CI that spit back something like: "you will have a panic at line 156 when your input is > 4"
A model checker can do that!
See this
https://model-checking.github.io/kani/tutorial-kinds-of-fail...
Other techniques are also possible
https://github.com/viperproject/prusti-dev#quick-example
(Here I could link a lot of things, I just selected two Rust projects to illustrate)
This works better if you are able to provide contracts in your API that says which guarantees you provide. Alternatively, asserts are useful too.
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Programming Languages Going Above and Beyond
You might be interested in the Prusti project, which statically checks for absence of reachable panics, overflows etc. It also allows user-defined specifications such as pre and post-conditions, loop body invariants, termination checking and so on.
https://github.com/viperproject/prusti-dev
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Trying to find a crate that allows you to constrain the value of arguments in various ways via a proc macro
This is called refinement types and prusti might be the project you saw.
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rustc-plugin: A framework for writing plugins that integrate with the Rust compiler
But there's also a lot of exciting work around formal verification like Prusti.
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Is there something like "super-safe" rust?
prusti
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A plan for cybersecurity and grid safety
Efforts: seL4, Project Everest, the Prossimo project of the ISRG, Let's Encrypt, and Prusti for the Rust language
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Prop v0.42 released! Don't panic! The answer is... support for dependent types :)
Wow that sounds really cool! I'm not an expert but does that mean that one day you could implement dependend types or refinement types in Rust as a crate ? I currently only know of tools like: Flux Creusot Kani Prusti
- Prusti: Static Analyzer for Rust
What are some alternatives?
zigself - An implementation of the Self programming language in Zig
MIRAI - Rust mid-level IR Abstract Interpreter
scenebuilder - Scene Builder is a visual, drag 'n' drop, layout tool for designing JavaFX application user interfaces.
kani - Kani Rust Verifier
cells - A Common Lisp implementation of the dataflow programming paradigm
Rudra - Rust Memory Safety & Undefined Behavior Detection
power-fx-host-samples - Samples for hosting Power Fx engine.
automem - C++-style automatic memory management smart pointers for D
impulse - Impossible Dev Tools for React and Tailwind
tectonic - A modernized, complete, self-contained TeX/LaTeX engine, powered by XeTeX and TeXLive.
halo - An experimental graph-based meta programming language
rust - Empowering everyone to build reliable and efficient software.