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by TwentyPosts
627 days ago
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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. And that's not even getting into the problem that it's a fairly controversial feature, since people are worried about terrible, hard to track specialisation trees. (See, inheritance.) |
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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/max...