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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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Joined July 2010

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    1. Jon Pretty‏ @propensive 10 May 2020

      I think that kind-polymorphism in Scala 3 has huge potential for libraries, but like most "higher" concepts, we introduce higher kinds only so we can eliminate them later. If Scala 3 supported functional dependencies between kinded types, we could gain a lot.

      1 reply 1 retweet 16 likes
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    2. Jon Pretty‏ @propensive 10 May 2020

      Different-kinded types already fit in the type hierarchy, each under their own kind top-type, and then *everything* is a subtype of `AnyKind`. If we could get a type's "kind top-type" from the type, we could define these functional dependencies to enable elimination later.

      1 reply 0 retweets 2 likes
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    3. Jon Pretty‏ @propensive 10 May 2020

      Here's how that might look. Imagine we want to define an interface common to `Show` and `Functor`. def apply[F[T] <: AnyKind, S <: T.kind]: F[S] = ... apply[Show, String] apply[Functor, Show] apply[Functor, String] // error

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    4. This Tweet is unavailable.
      Jon Pretty‏ @propensive 10 May 2020
      Replying to @jeremyrsmith

      Agreed, but Scala already made its decisive but arbitrary choice about partial unification in 2.12...

      11:25 AM - 10 May 2020 from Krakow, Poland
      0 replies 0 retweets 0 likes

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