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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 19 Jul 2020
      Replying to @gabro27

      No, though the mistake is in one (or maybe both) of the assumptions... It's very subtle, though.

      0 replies 0 retweets 1 like
    2. This Tweet is unavailable.
    3. Stefano Baghino‏ @stefanobaghino 20 Jul 2020

      Why would the underscore suppress the erasure warning though?

      1 reply 0 retweets 0 likes
    4. Jon Pretty‏ @propensive 20 Jul 2020
      Replying to @stefanobaghino @gabro27

      It doesn't.

      1 reply 0 retweets 0 likes
    5. Stefano Baghino‏ @stefanobaghino 20 Jul 2020
      Replying to @propensive @gabro27

      Interesting: if I change the `0` into an `"a"` I get a fruitless type test compilation warning and `1` as output (using Scala 2.12.10). This is the expected result (due to erasure), but in both the original and the new case I would have expected a type erasure warning.

      1 reply 0 retweets 0 likes
    6. Stefano Baghino‏ @stefanobaghino 20 Jul 2020
      Replying to @stefanobaghino @propensive @gabro27

      So I guess the compiler has enough information in this specific case to know that checking for a `List[Int]` makes sense and does not then issue the type erasure warning. Not sure if this is the subtlety you were talking about.

      1 reply 0 retweets 2 likes
    7. Jon Pretty‏ @propensive 20 Jul 2020
      Replying to @stefanobaghino @gabro27

      Yes, exactly.

      1 reply 0 retweets 3 likes
    8. Stefano Baghino‏ @stefanobaghino 20 Jul 2020
      Replying to @propensive @gabro27

      Nice, is this a (relatively) new thing? I'm quite sure I've seen type erasure warnings on similar checks years ago and avoided them since then.

      1 reply 0 retweets 0 likes
    9. Jon Pretty‏ @propensive 20 Jul 2020
      Replying to @stefanobaghino @gabro27

      No, it was there in Scala 2.10, and maybe earlier.

      1 reply 0 retweets 0 likes
    10. Stefano Baghino‏ @stefanobaghino 20 Jul 2020
      Replying to @propensive @gabro27

      Wow, my memories must have tricked me.

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 20 Jul 2020
      Replying to @stefanobaghino @gabro27

      The type erasure warnings still appear... but only when they ought to!

      3:40 AM - 20 Jul 2020
      • 1 Like
      • Stefano Baghino
      0 replies 0 retweets 1 like

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