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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 22 Nov 2013

      I'm discovering Scala is more kindsafe than I'd previously realised; unfortunately, I think I want dynamic kinding right now.

      1 reply 0 retweets 0 likes
    2.  🔴 Lars Hupel‏ @larsr_h 22 Nov 2013
      Replying to @propensive

      @propensive Uh. I'm not even sure I know what "dynamic kinding" is supposed to mean :-)

      1 reply 0 retweets 0 likes
    3. Jon Pretty‏ @propensive 22 Nov 2013
      Replying to @larsr_h

      @larsr_h I *want* it to mean a way to avoid the kind error I'm getting (which seems to relate only to a covariance annotation)...

      1 reply 0 retweets 0 likes
    4.  🔴 Lars Hupel‏ @larsr_h 22 Nov 2013
      Replying to @propensive

      @propensive Beware, for there are soundness problems ahead.

      2 replies 0 retweets 0 likes
    5.  🔴 Lars Hupel‏ @larsr_h 22 Nov 2013
      Replying to @larsr_h

      @propensive … to be a little bit more clear: When abstracting over type constructors with variance annotations, scalac is sometimes unsound.

      2 replies 0 retweets 0 likes
    6. Jon Pretty‏ @propensive 22 Nov 2013
      Replying to @larsr_h

      @larsr_h Ah. I don't understand these things well enough (yet) to know whether it's me or scalac that's at fault.

      1 reply 1 retweet 0 likes
    7.  🔴 Lars Hupel‏ @larsr_h 22 Nov 2013
      Replying to @propensive

      @propensive e.g. https://issues.scala-lang.org/browse/SI-7872 , https://issues.scala-lang.org/browse/SI-2066  and some more.

      2 replies 0 retweets 0 likes
    8. Jason Zaugg  ⚙️‏ @retronym 22 Nov 2013
      Replying to @larsr_h

      @larsr_h @propensive I think I've plugged the first hole: https://github.com/scala/scala/pull/3178 …

      3 replies 0 retweets 0 likes
      Jon Pretty‏ @propensive 22 Nov 2013
      Replying to @retronym

      @retronym @larsr_h At the very least, there's a gap in my understanding which I need to bridge first!

      8:35 AM - 22 Nov 2013
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Jason Zaugg  ⚙️‏ @retronym 22 Nov 2013
          Replying to @propensive

          @propensive @larsr_h My patch will give strictly more errors, so it's unlikely to help if you want fewer :)

          1 reply 0 retweets 0 likes
        2. Jon Pretty‏ @propensive 22 Nov 2013
          Replying to @retronym

          @retronym @larsr_h I fear so, but it might give me a better error sooner!

          0 replies 0 retweets 0 likes
          3. End of conversation

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