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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 4 Apr 2017

      Jon Pretty Retweeted Dale Wijnand

      Yep, the existentials are the expanded form of @tpolecat's projections. And yeah, there's no reasonable way of merging invariant members...https://twitter.com/dwijnand/status/849217180000559105 …

      Jon Pretty added,

      Dale Wijnand @dwijnand
      Replying to @dwijnand @propensive and 2 others
      https://groups.google.com/d/msg/scala-language/vH_g2aAM62Q/iYqs_ARHgOsJ … (via https://groups.google.com/d/topic/scala-internals/qAICKMOa_f0 …) keywords: isSubType type-equivalence symmetry pic.twitter.com/oumpLUzyeD
      1 reply 0 retweets 0 likes
    2. Dale Wijnand‏ @dwijnand 4 Apr 2017
      Replying to @propensive @tpolecat

      Also looks like `(A with B)#M` isn't equivalent to `x.M forSome { val x: A with B }`:pic.twitter.com/UQDHfsqf1v

      2 replies 0 retweets 0 likes
      Jon Pretty‏ @propensive 4 Apr 2017
      Replying to @dwijnand @tpolecat

      That looks even more surprising. The difference is meant to be syntactical. Are your two `=:=` instances ambiguous, perchance?

      4:46 AM - 4 Apr 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Dale Wijnand‏ @dwijnand 4 Apr 2017
          Replying to @propensive @tpolecat

          WDYM by ambiguous? My =:= implicit instances are both not null.

          1 reply 0 retweets 0 likes
        2. Jon Pretty‏ @propensive 4 Apr 2017
          Replying to @dwijnand @tpolecat

          I mean ev2 and ev3 have identical types, and the compiler can't decide between them.

          0 replies 0 retweets 0 likes
          3. End of conversation

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