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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. P. Oscar Boykin‏ @posco 22 Sep 2017
      Replying to @mandubian

      Right. I mean from my point of view. The opaque type would help me write safer code with no added cost. So I care in this case.

      2 replies 0 retweets 2 likes
    2. mandubianhotep‏ @mandubian 22 Sep 2017
      Replying to @posco

      But has anything bad happened about it that I missed?

      1 reply 0 retweets 0 likes
    3. P. Oscar Boykin‏ @posco 22 Sep 2017
      Replying to @mandubian

      Yeah, Martin seems to have changed his mind and wants to put a new Top type that could also maybe do all this.

      4 replies 0 retweets 2 likes
    4. Paolo G. Giarrusso‏ @Blaisorblade 23 Sep 2017
      Replying to @posco @mandubian

      Didn't people complain Scala looks like a mishmash of overlapping features? Now it's bad when Martin tries to avoid it?

      1 reply 0 retweets 2 likes
    5. Paolo G. Giarrusso‏ @Blaisorblade 23 Sep 2017
      Replying to @Blaisorblade @posco @mandubian

      Also, "maybe" seems a bit uncharitable. The idea here is just value classes fixed, and there's a design document with details in the thread.

      3 replies 0 retweets 0 likes
    6. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @Blaisorblade @mandubian

      Can you link me? All I see was the doc from @d6 and @jvican. I didn’t see a detailed doc on Top.

      1 reply 0 retweets 0 likes
    7. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @posco @Blaisorblade and

      I fear it creates a lot of weird special cases when also used to represent unboxed newtype.

      2 replies 0 retweets 0 likes
    8. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @posco @Blaisorblade and

      Is case class Foo(x: Int) extends Top legit? (I guess no). class Bar(x: Int, y: String) extends Top (I guess no again).

      1 reply 0 retweets 0 likes
    9. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @posco @Blaisorblade and

      Is class Foo(x: Int) extends Any okay? If so, does it box? Seems like complex rules between extends AnyVal, extends Any, extends Top

      2 replies 0 retweets 0 likes
    10. P. Oscar Boykin‏ @posco 23 Sep 2017
      Replying to @posco @Blaisorblade and

      I didn’t see any of this answered. Opaque type is much more contained and lacking most of these consistency questions.

      2 replies 0 retweets 2 likes
      Jon Pretty‏ @propensive 23 Sep 2017
      Replying to @posco @Blaisorblade and

      The SIP still doesn't explain what happens here: (x: Unsigned) match { case y: Int => ... } I wouldn't say it "lacks consistency questions".

      2:28 PM - 23 Sep 2017
      3 replies 0 retweets 0 likes
        1. Jon Pretty‏ @propensive 23 Sep 2017
          Replying to @propensive @posco and

          Maybe it just needs a bit more work to get past a bunch of corner cases. Hopefully, because it looks like an improvement to value classes!

          0 replies 0 retweets 0 likes
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        2. New conversation
        1. P. Oscar Boykin‏ @posco 23 Sep 2017
          Replying to @propensive @Blaisorblade and

          I thought it did. I thought opaque said that is a compiler error?

          2 replies 0 retweets 0 likes
        2. Jon Pretty‏ @propensive 23 Sep 2017
          Replying to @posco @Blaisorblade and

          Don't remember reading it and I searched the SIP for "match", but might've missed it. Possibly an error like "scrutinee is incompatible..."?

          0 replies 0 retweets 1 like
          3. End of conversation
        1. Paolo G. Giarrusso‏ @Blaisorblade 23 Sep 2017
          Replying to @propensive @posco and

          At least for Top, parametricity forces the answer (you can't match). And to be really abstract, abstract/opaque types should do the same.

          0 replies 0 retweets 0 likes
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