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It's a surprisingly short list: impl trait, specialisation, and obvs higher kinded types, in increasing order of importance.
niceeeee. I thought impl trait made it to stable tho! :D https://github.com/rust-lang/rust/pull/49255#issuecomment-375368749 … Curious about the specialization stuff; been hearing about it lately, and don't have a good grip on it yet. Sounds really interesting tho!
My use case for specialisation is that I can super-optimise equality checking for persistent containers of values that implement Eq, but not just PartialEq, and I need specialisation to be able to provide implementations for both cases.
We want specialization to optimize certain things. For instance to_string on a String returns the String. It used to not be the case and went through fmt to make a new String! We've just not found a way that was sound yet so that we can let everyone outside the compiler use it.
But that might also change by end of 2018 as we might have a way to make specialization sound, at least a very minimal version of it.
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