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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 20 Oct 2019

      I'm going away for a week, and left my laptop behind. Feeling vulnerable.

      10 replies 0 retweets 54 likes
    2. Nicolas Rinaudo‏ @NicolasRinaudo 20 Oct 2019
      Replying to @propensive

      That doesn’t bode well for contextual 2.13 being released soon

      1 reply 0 retweets 1 like
    3. Jon Pretty‏ @propensive 27 Oct 2019
      Replying to @NicolasRinaudo

      This is the tweet I was looking for when I found your earlier one... I spent a few hours trying to work out why it's not working, and it looks like a bug in Scala 2.13. As it says, the macro doesn't get expanded...

      2 replies 0 retweets 0 likes
    4. Jon Pretty‏ @propensive 27 Oct 2019
      Replying to @propensive @NicolasRinaudo

      Contextual jumps through some roundabout hoops to invoke the macro without users needing to specify a `def prefix = macro Contextual.whatever` call, with a lot of complex types. This used to work well, but I think it's obscure enough that 2.13 doesn't know it needs to expand it.

      2 replies 0 retweets 0 likes
    5. Jon Pretty‏ @propensive 27 Oct 2019
      Replying to @propensive @NicolasRinaudo

      The solution, I fear, is to replace all of this machinery which no longer works, and resort to the direct `macro Contextual...` invocation. Unfortunately, I think it's at least a full day's work, which I won't have before Christmas...

      1 reply 0 retweets 0 likes
    6. Jon Pretty‏ @propensive 27 Oct 2019
      Replying to @propensive @NicolasRinaudo

      At best, I might be able to create a minimized failure (working in 2.12, failing in 2.13) and submit it as a Scala bug, but as it's related to macros, I don't know how likely it is to be fixed.

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 27 Oct 2019
      Replying to @propensive @NicolasRinaudo

      Alternatively, if anyone has a convenient working "git bisect" setup on `scalac` nightlies, that might be a good way to find the commit where it stops working, and could hint at a fix. But I just don't have time to set that up now. :(

      12:07 PM - 27 Oct 2019
      0 replies 0 retweets 0 likes

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