> Afaik specialisation (in full generality) would cause soundness issues, so it's not even just blocked by the trait solver, it's also blocked by figuring out a

> Afaik specialisation (in full generality) would cause soundness issues, so it's not even just blocked by the trait solver, it's also blocked by figuring out a 'slimmed down' proposal that fixes those. There is already a proposal for how to prevent unsound specializations [0], but it requires a lot of support from the trait solver, hence why I said it's blocked on it. [0]: https://smallcultfollowing.com/babysteps/blog/2018/02/09/maximally-minimal-specialization-always-applicable-impls/ https://smallcultfollowing.com/babysteps/blog/2018/02/09/max...