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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. Julien Tournay‏ @skaalf Feb 15

      Julien Tournay Retweeted Julien Tournay

      No one ? Maybe @propensive would know. You seemed keen to tackle my little challenge last time :phttps://twitter.com/skaalf/status/1361244299254517762 …

      Julien Tournay added,

      Julien Tournay @skaalf
      I came up yesterday with the following @scala_lang minimized example which I thought would compile but does not. It seems fairly similar to https://twitter.com/not_xuwei_k/status/1332751181119184896?s=20 …. Am I being overly optimistic about #scala3 ? Am I missing something ? Is that a bug ? Is it just not supported ? pic.twitter.com/sxcmWRe2EM
      1 reply 0 retweets 2 likes
    2. Jon Pretty‏ @propensive Feb 16
      Replying to @skaalf

      I did actually play around with it yesterday, though I'm not at all surprised it doesn't work... ;) I wanted to spend a bit longer trying to understand it, though...

      1 reply 0 retweets 0 likes
    3. Julien Tournay‏ @skaalf Feb 16
      Replying to @propensive

      Ahah. I'm not sure I am all that surprised myself. Having that compile would have been a pleasant surprise 😊

      1 reply 0 retweets 0 likes
    4. Jon Pretty‏ @propensive Feb 17
      Replying to @skaalf

      By the way, did you have anything in mind when you added `extends Format` to the enum case definition?

      1 reply 0 retweets 0 likes
    5. Julien Tournay‏ @skaalf Feb 17
      Replying to @propensive

      Not really. I suppose I did it out of habit from Scala 2.

      1 reply 0 retweets 1 like
    6. Jon Pretty‏ @propensive Feb 17
      Replying to @skaalf

      There are basically just a few too many things going on here: - dependent function type - curried function - match type - partial function - beta reduction - eta expansion and I think the recognition of valid implementation of a match type isn't tenacious enough to keep looking.

      2 replies 0 retweets 0 likes
    7. Julien Tournay‏ @skaalf Feb 19
      Replying to @propensive

      I looked into this a little bit more and made *some* progress. Things are a bit weird and I'm leaning toward a bug now:pic.twitter.com/nj724s8Oky

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive Feb 19
      Replying to @skaalf

      This looks just like a straight dealiasing error now. But there's still enough complexity involved that I'm not surprised... the type match requirements as documented, IIRC, don't cover the case when the match type is used as a type parameter in the match expression...

      10:01 AM - 19 Feb 2021 from Frankfurt on the Main, Germany
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Julien Tournay‏ @skaalf Feb 19
          Replying to @propensive

          So it's not supposed to be supported? The line between what works and what doesn't feel very arbitrary here.

          1 reply 0 retweets 0 likes
        2. Jon Pretty‏ @propensive Feb 19
          Replying to @skaalf

          I'm not sure. Recursive match types work, which is more of a surprise to me (but maybe they're a more motivating example, so have had more attention). But generally speaking, it seems like it's the most advanced new features that are most problematic.

          1 reply 0 retweets 0 likes
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