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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. Jules Ivanic‏ @guizmaii 11 Dec 2019

      In Scala, is it possible to "subtract" a type from a composed type like this one: "A with B with C" ? 🤔

      6 replies 0 retweets 4 likes
      Show this thread
    2. Jon Pretty‏ @propensive 11 Dec 2019
      Replying to @guizmaii

      No, it's not possible.

      2 replies 0 retweets 1 like
    3. Jules Ivanic‏ @guizmaii 11 Dec 2019
      Replying to @propensive

      Will Dotty change that?

      1 reply 0 retweets 0 likes
    4. Jon Pretty‏ @propensive 11 Dec 2019
      Replying to @guizmaii

      I don't think it will change anything for intersection types, but it might for union types. The mechanism, if it gets implemented, would be to pattern match some cases against a union type, and the catchall's type would be the Union of the unmatched types from the original union.

      1 reply 0 retweets 3 likes
    5. Jon Pretty‏ @propensive 11 Dec 2019
      Replying to @propensive @guizmaii

      This code exists already in the compiler for doing exhaustivity checking. But that currently happens post-typer, and it would need to be promoted to the typer in order to make use of the newly-formed union type it calculates. It might happen.

      1 reply 0 retweets 1 like
    6. This Tweet is unavailable.
      Jon Pretty‏ @propensive 11 Dec 2019
      Replying to @flaviusbraz @guizmaii

      No, I think that given a type A with B, and a type A (maybe both inferred from value parameters), he would like to have the compiler infer B.

      6:11 PM - 11 Dec 2019
      0 replies 0 retweets 0 likes
        1. This Tweet is unavailable.
        2. Jules Ivanic‏ @guizmaii 11 Dec 2019
          Replying to @flaviusbraz @propensive

          Jon is right. It's what I have in mind.

          0 replies 0 retweets 0 likes
          3. End of conversation

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