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# An Overview of Chalk # An Overview of Chalk
> Chalk is under heavy development, so if any of these links are broken or if > Chalk is under heavy development, so if any of these links are broken or if
> any of the information is inconsistent with the code or outdated, please open > any of the information is inconsistent with the code or outdated, please
> an issue so we can fix it. If you are able to fix the issue yourself, we would > [open an issue][rustc-issues] so we can fix it. If you are able to fix the issue yourself, we would
> love your contribution! > love your contribution!
[Chalk][chalk] recasts Rust's trait system explicitly in terms of logic [Chalk][chalk] recasts Rust's trait system explicitly in terms of logic
programming by "lowering" Rust code into a kind of logic program we can then programming by "lowering" Rust code into a kind of logic program we can then
execute queries against. Its goal is to be an executable, highly readable execute queries against. (See [*Lowering to Logic*][lowering-to-logic] and
specification of the Rust trait system.[^negativechalk] [*Lowering Rules*][lowering-rules]) Its goal is to be an executable, highly
readable specification of the Rust trait system.
There are many expected benefits from this work. It will consolidate our There are many expected benefits from this work. It will consolidate our
existing, somewhat ad-hoc implementation into something far more principled and existing, somewhat ad-hoc implementation into something far more principled and
expressive, which should behave better in corner cases, and be much easier to expressive, which should behave better in corner cases, and be much easier to
extend.[^negativechalk] extend.
## Resources ## Resources
@ -124,9 +125,10 @@ is the function that is ultimately called.
See [The SLG Solver][slg]. See [The SLG Solver][slg].
[^negativechalk]: [*Negative reasoning in Chalk* by Aaron Turon](http://aturon.github.io/blog/2017/04/24/negative-chalk/) [rustc-issues]: https://github.com/rust-lang-nursery/rustc-guide/issues
[chalk]: https://github.com/rust-lang-nursery/chalk [chalk]: https://github.com/rust-lang-nursery/chalk
[lowering-to-logic]: traits-lowering-to-logic.html
[lowering-rules]: traits-lowering-rules.html
[ast]: https://en.wikipedia.org/wiki/Abstract_syntax_tree [ast]: https://en.wikipedia.org/wiki/Abstract_syntax_tree
[chalk-ast]: https://github.com/rust-lang-nursery/chalk/blob/master/chalk-parse/src/ast.rs [chalk-ast]: https://github.com/rust-lang-nursery/chalk/blob/master/chalk-parse/src/ast.rs
[universal quantification]: https://en.wikipedia.org/wiki/Universal_quantification [universal quantification]: https://en.wikipedia.org/wiki/Universal_quantification