Should @rustlang have something like `typeclass Applicative (or Monad)` so that we needn’t to implement `Option::fold`, `Result::fold`, `Future::fold` many times?https://twitter.com/djco/status/1091680414714994688 …
Replying to @zty0826
Not possible currently; we need more type system features first
11:58 AM - 4 Feb 2019
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