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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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propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive 19 May 2017

      Jon Pretty Retweeted Jon Pretty

      News just in: Dotty's syntax has changed: you now need to specify type parameters on the cases. "Too much magic, otherwise", says @odersky.https://twitter.com/propensive/status/864941056600813568 …

      Jon Pretty added,

      Jon Pretty @propensive
      A reverse linked-list, as an enumeration in Dotty: enum Tsil[+T] { case Lin case Snoc(init: Tsil[T], last: T) }
      3 replies 2 retweets 3 likes
    2. Lgd. Viktor Klang‏ @viktorklang 19 May 2017
      Replying to @propensive @odersky

      Like so? enum Stack[+T] { case Empty[Nothing] case Push[T](pop: Stack[T], peek: T) }

      1 reply 0 retweets 0 likes
    3. Jon Pretty‏ @propensive 19 May 2017
      Replying to @viktorklang @odersky

      I'm not sure the `[Nothing]` is required. The change isn't merged yet, so I can't test it...

      1 reply 0 retweets 0 likes
    4. Lgd. Viktor Klang‏ @viktorklang 19 May 2017
      Replying to @propensive @odersky

      Wasn't the automatic Nothing part the most perceivably magic part?

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 19 May 2017
      Replying to @viktorklang @odersky

      Sort of... Sort of not. If you didn't make the type parameter covariant, dotc would refuse to infer it, with a clear message.

      4:25 AM - 19 May 2017
      1 reply 0 retweets 0 likes
        1. Lgd. Viktor Klang‏ @viktorklang 19 May 2017
          Replying to @propensive @odersky

          For a casual reader not familiar w. the intricacies of type inference in the face of covariance, it's sort of indistinguishable from magic?

          0 replies 0 retweets 2 likes
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