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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 11 Feb 2015

      Oh, ok. I just solved it by reordering my type parameters.

      1 reply 0 retweets 1 like
    2. Ofer Ron‏ @oferron 11 Feb 2015
      Replying to @propensive

      @propensive which is one of the biggest compiler annoyances out there

      2 replies 0 retweets 0 likes
    3. Jon Pretty‏ @propensive 11 Feb 2015
      Replying to @oferron

      @oferron It's annoying because I don't understand why it makes a difference in this particular case. Usually I can see a reason... :(

      1 reply 0 retweets 0 likes
    4. Ofer Ron‏ @oferron 11 Feb 2015
      Replying to @propensive

      @propensive I had a case (might be fixed now) where reordering the implicit params was the key to getting stuff to compile.

      2 replies 0 retweets 0 likes
    5. Jon Pretty‏ @propensive 11 Feb 2015
      Replying to @oferron

      @oferron Yeah, implicit parameters work like ordinary parameter *blocks* - evaluated in turn. My problem was with *type* parameters... :(

      1 reply 0 retweets 0 likes
    6. Jon Pretty‏ @propensive 11 Feb 2015
      Replying to @propensive

      @oferron It's rare that a different order of implicit parameters will make a difference, but it does sometimes...

      1 reply 0 retweets 0 likes
    7. Ofer Ron‏ @oferron 11 Feb 2015
      Replying to @propensive

      @propensive I know implicit are evaluated in blocks, but the order shouldn't matter. Or at least be consistent.

      2 replies 0 retweets 0 likes
    8. Ofer Ron‏ @oferron 11 Feb 2015
      Replying to @oferron

      @propensive think about def foo[A, B](l:List[A], f:A=>B) Using this order, A can be inferred, but it won't be. Unless it's higher kinded

      2 replies 0 retweets 0 likes
    9. Ofer Ron‏ @oferron 11 Feb 2015
      Replying to @oferron

      @propensive where the order does matter cause it must resolve the constraint. I assume that's what happens in your example (I'm on the phone

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 11 Feb 2015
      Replying to @oferron

      @oferron Oh, it's inconsistent... but really useful!

      6:36 AM - 11 Feb 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Jon Pretty‏ @propensive 11 Feb 2015
          Replying to @propensive

          @oferron It means we can choose whether a parameter plays a part in an inferred constraint (i.e. by LUBbing) or not.

          1 reply 0 retweets 0 likes
        2. Ofer Ron‏ @oferron 11 Feb 2015
          Replying to @propensive

          @propensive but it plays hell with trying to get people to adopt.

          1 reply 0 retweets 0 likes
        3. Show replies

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