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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 Jul 2020

      Jon Pretty Retweeted Jon Pretty

      So, most people were wrong about this, and it also split opinion rather evenly... I suspect even that some of the people who were right were right for the wrong reasons! But the Scala compiler is actually being safe and correct, here. Explanation below...https://twitter.com/propensive/status/1284952925727580165 …

      Jon Pretty added,

      Jon Pretty @propensive
      Ok, without checking, what do you think happens? (List(0): Seq[Int]) match { case _: List[Int] => 1 case _ => 2 }
      3 replies 3 retweets 14 likes
      Show this thread
    2. Jim O'Flaherty‏ @jimofl 20 Jul 2020
      Replying to @propensive

      tl;dr Poll answer "Compiles, no warning → 1" is correct. Right?

      1 reply 0 retweets 1 like
    3. This Tweet is unavailable.
      Jon Pretty‏ @propensive 20 Jul 2020
      Replying to @jeremyrsmith @jimofl

      No, sealedness isn't required to solve it. Any as-yet-unknown subtype can still be checked at runtime as a `List[_]` and the `Int` is still known statically.

      1:46 PM - 20 Jul 2020
      • 1 Like
      • Jim O'Flaherty
      1 reply 0 retweets 1 like
        1. This Tweet is unavailable.
        2. Jon Pretty‏ @propensive 20 Jul 2020
          Replying to @jeremyrsmith @jimofl

          That part comes from the runtime check, so it's only for that particular case...

          0 replies 0 retweets 0 likes
          3. End of conversation

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