pny1-assignment
chalk
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pny1-assignment | chalk | |
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1 | 25 | |
12 | 1,768 | |
- | 1.5% | |
0.0 | 7.1 | |
over 3 years ago | 19 days ago | |
Agda | Rust | |
- | GNU General Public License v3.0 or later |
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pny1-assignment
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Scrapping the typeclasses
Actually, you can, in a dependently typed language, in a first class way: You require a suitable equality proof. See here for an exploration of how this can work.
chalk
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Why did Prolog lose steam? (2010)
The Rust compiler uses a Prolog-like query language internally for type checking generic requirements and traits: https://github.com/rust-lang/chalk
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Why doesn't rust-analyzer reuse infrastructures of rustc?
rust-analyzer already uses chalk (https://github.com/rust-lang/chalk) which should replace the current trait resolver.
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Why use Rust on the backend? by Adam Chalmers
Well it's quite easy to come to that conclusion: The code compiles with rustc, which is currently the reference implementation. If rust-analyzer does not match rustc's behavior it's an issue in their implementation. That written it's not that easy to fix as it's related to how rust-analyzer resolves types/traits. rust-analyzer uses chalk for this, which is known to be incomplete/diverging from the RFC'ed behavior. Now one could argue that we can simplify diesel to the point where it works will with rust-analyzer/chalk, but that would result in basically removing core diesel features that exist way longer than rust-analyzer.
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Why has functional programming become so popular in non-academic settings?
> Not all of those things work well in the real world. E.g. logic programming (prolog) is cool but ultimately never really caught on.
It does have its niches though. For example, there is a trait solver for Rust called Chalk that uses a Prolog-inspired language because trait bounds basically define a logic:
https://github.com/rust-lang/chalk
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General mathematical expression analysis system
Maybe something in the prolog/datalog direction could be useful? Notably Rust has Chalk to help with trait resolution ("Chalk is a library that implements the Rust trait system, based on Prolog-ish logic rules.")
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Useful lesser-used languages?
There has been work to implement part of the Rust typing logic in the Chalk Engine which uses a prolog-ish syntax to describe its rules.
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Can you have a function return different types known at compile time
That's something Chalk is trying to tackle.
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Compile time wins today
We probably will see all of them at some point -- polonius is a current effort to make the borrow checker accept more valid programs, in a way that also simplifies the logic and is probably a bit faster than the current NLL system, chalk is an attempt to do a similar thing for the trait system, and cranelift is a project that seeks to replace the LLVM codegen backend. But obviously, these are very large and complex projects that are gonna take some time.
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What is the difference between associated types and generics?
Do Rust developers realize that? Oh, yes, absolutely, that's why we have this:
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Question about Trait Bounds (from Rust for Rustaceans)
For me an attempt to write where HashMap: FromIterator and then use new and insert was totally bizzare because currently rustc is pretty primitive and doesn't do super-complex machinery needed to do what you want. Chalk may fix that one day, but it's nowhere near to being ready for inclusion into rustc thus I wouldn't even attempt to do what you tried to do… but that's not something you are supposed to know before reading this book!
What are some alternatives?
polonius - Defines the Rust borrow checker.
miri - An interpreter for Rust's mid-level intermediate representation
prolog - The only reasonable scripting engine for Go.
lccc - Lightning Creations Compiler Frontend for various languages
expr - Expression language and expression evaluation for Go [Moved to: https://github.com/expr-lang/expr]
unsafe-code-guidelines - Forum for discussion about what unsafe code can and can't do
intellij-lsp-server - Exposes IntelliJ IDEA features through the Language Server Protocol.
tyrade - A pure functional language for type-level programming in Rust
eglot - A client for Language Server Protocol servers
rust-analyzer - A Rust compiler front-end for IDEs [Moved to: https://github.com/rust-lang/rust-analyzer]
rfcs - RFCs for changes to Rust