in flux these days. Supporting things like impl<T, U> From<Option<T>> for Option<U> where U: From<T> is very much desired – it was mentioned in the extending-?-to-more-types, for example – but whatever that will be probably can’t be determined until those prerequisites are complete, and right now that’s lower priority than the 2018 edition
Эх жаль, недавно как раз такое надо было, пришлось костылями делать
А откуда это кстати?
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