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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 2 Nov 2017

      This is *all* the code you need to get generic derivation of Show typeclasses with Magnolia. Come to my @ScalaIO_FR talk later!pic.twitter.com/RlRg8Gjl9C

      2 replies 6 retweets 28 likes
    2. Jorge Vicente Cantero‏ @jvican 2 Nov 2017
      Replying to @propensive @ScalaIO_FR

      Make it clear in the talk how awfully slow automatic generic derivation in Scala is, please 😃

      2 replies 0 retweets 0 likes
    3. Jon Pretty‏ @propensive 2 Nov 2017
      Replying to @jvican @ScalaIO_FR

      I'm going to make it fast.

      1 reply 0 retweets 5 likes
    4. Jon Pretty‏ @propensive 5 Nov 2017
      Replying to @propensive @jvican @ScalaIO_FR

      Is ~10x Shapeless's derivation speed fast enough for you?

      2 replies 0 retweets 4 likes
    5. Jorge Vicente Cantero‏ @jvican 5 Nov 2017
      Replying to @propensive @ScalaIO_FR

      It's a great step towards the right direction, certainly! I feel the deriv. times could be addressed in the compiler more systematically.

      2 replies 0 retweets 0 likes
    6. Jon Pretty‏ @propensive 5 Nov 2017
      Replying to @jvican @ScalaIO_FR

      There's not much more the compiler can do: My ASTs are semantically quite minimal yet most of the compile time is still typechecking them.

      1 reply 0 retweets 0 likes
    7. Jon Pretty‏ @propensive 5 Nov 2017
      Replying to @propensive @jvican @ScalaIO_FR

      The compiler may help with the implicit search and AST generation, but those ASTs are fundamentally large and therefore slow to typecheck.

      1 reply 0 retweets 0 likes
    8. Jorge Vicente Cantero‏ @jvican 6 Nov 2017
      Replying to @propensive @ScalaIO_FR

      I would need to have a closer look, but I can tell you I'm tired of benchmark the typer and 90% of time is in implicit search, no asts.

      1 reply 0 retweets 0 likes
    9. Jorge Vicente Cantero‏ @jvican 6 Nov 2017
      Replying to @jvican @propensive @ScalaIO_FR

      Generally, simple AST typechecking is really cheap. The cost of implicit search dominates compile times in shapeless and Circe.

      2 replies 0 retweets 0 likes
      Jon Pretty‏ @propensive 6 Nov 2017
      Replying to @jvican @ScalaIO_FR

      That's because implicit search needs to repeatedly do lots of typechecking to check the validity of implicits. It's still typechecking!

      12:46 AM - 6 Nov 2017
      0 replies 0 retweets 0 likes

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