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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 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
    2. 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
    3. 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
    4. 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".

      3 replies 0 retweets 0 likes
    5. 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
    6. Jon Pretty‏ @propensive 23 Sep 2017
      Replying to @posco @Blaisorblade and

      Though what about, (x: Any) match { case y: Unsigned => ... } You can do it for `Int` so why not an opaque "Int"?

      2 replies 0 retweets 0 likes
    7. Paolo G. Giarrusso‏ @Blaisorblade 23 Sep 2017
      Replying to @propensive @posco and

      You can't match against abstract types, and opaque types should have similar semantics (because they're semantically the same, duh).

      1 reply 0 retweets 1 like
    8. Paolo G. Giarrusso‏ @Blaisorblade 23 Sep 2017
      Replying to @Blaisorblade @propensive and

      This seems a piece of evidence that opaque types might seem easy (short) but aren't simple. Good answers exist.

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

      Honestly, scala already has Any, AnyRef and AnyVal. Adding Top to the mix seems like too much.

      2 replies 0 retweets 3 likes
    10. Jon Pretty‏ @propensive 23 Sep 2017
      Replying to @posco @Blaisorblade and

      I know that a lot of work has already gone into an alternative top/bottom type in Nicolas Stucki's research in Phantom Types in Dotty.

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

      Not sure if this is related to Martin's proposal (where is it, btw?), but if the same it's had a lot of thought already; not half-baked.

      11:15 PM - 23 Sep 2017
      1 reply 0 retweets 0 likes
        1. Alessandro Lacava‏ @lambdista 24 Sep 2017
          Replying to @propensive @posco and

          Just got it via @kwarkk. Here it is:https://contributors.scala-lang.org/t/pre-sip-parametric-top/1177 …

          0 replies 2 retweets 2 likes
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