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BRIAN_____'s profile
Brian Smith
Brian Smith
Brian Smith
@BRIAN_____

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Brian Smith

@BRIAN_____

Code farmer. Security, crypto, performance, networking, usability. Rust, C++, C, Haskell, DSLs, etc. *ring*, webpki, crypto-bench, mozilla::pkix.

Honolulu & San Francisco
briansmith.org
Joined April 2008

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    1. Who ordered *that*?‏ @ManishEarth 27 Jan 2017
      Replying to @Gankro

      Helps stuff like returning Result<T, Never> in generic APIs. Like the FromStr impl on String

      1 reply 0 retweets 0 likes
    2. Alexis Beingessner‏ @Gankro 27 Jan 2017
      Replying to @ManishEarth

      I don't see how that's relevant to the given case.

      1 reply 0 retweets 0 likes
    3. Who ordered *that*?‏ @ManishEarth 27 Jan 2017
      Replying to @Gankro

      Oh wait I see what you mean.

      1 reply 0 retweets 0 likes
    4. Who ordered *that*?‏ @ManishEarth 27 Jan 2017
      Replying to @ManishEarth @Gankro

      No, I don't. The rfc isn't actually about the semantics of what happens when you match on a ! value.

      1 reply 0 retweets 0 likes
    5. Who ordered *that*?‏ @ManishEarth 27 Jan 2017
      Replying to @ManishEarth @Gankro

      That is UB -- it's about letting the compiler make more assumptions about that never happening.

      1 reply 0 retweets 0 likes
    6. Alexis Beingessner‏ @Gankro 27 Jan 2017
      Replying to @ManishEarth

      ok but why is most of the RFC discussion about matching on !, and blocking the stabilization of !.

      1 reply 0 retweets 0 likes
    7. Who ordered *that*?‏ @ManishEarth 27 Jan 2017
      Replying to @Gankro

      it affects whether or not &! is valid in unsafe code

      1 reply 0 retweets 0 likes
    8. Alexis Beingessner‏ @Gankro 27 Jan 2017
      Replying to @ManishEarth

      why would it be, and why would it ever matter

      1 reply 0 retweets 0 likes
    9. Who ordered *that*?‏ @ManishEarth 27 Jan 2017
      Replying to @Gankro

      (a) folks have used it to represent void (b) generic unsafe code idk

      1 reply 0 retweets 0 likes
    10. Alexis Beingessner‏ @Gankro 27 Jan 2017
      Replying to @ManishEarth

      those are *Void, and that's Different from &Void. Obviously *Void is valid because it can dangle.

      2 replies 0 retweets 1 like
      Brian Smith‏ @BRIAN_____ 27 Jan 2017
      Replying to @Gankro @ManishEarth

      *Void could also just be assumed to be null, since that is its only valid value.

      7:48 PM - 27 Jan 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Who ordered *that*?‏ @ManishEarth 27 Jan 2017
          Replying to @BRIAN_____ @Gankro

          No, raw pointers are conceptually just integers with a phantom type parameter, all values are valid.

          1 reply 0 retweets 0 likes
        3. Brian Smith‏ @BRIAN_____ 27 Jan 2017
          Replying to @ManishEarth @Gankro

          I mean when you dereference one, the compiler can just assume it's NULL, so UB, so deref should be statically rejected.

          0 replies 0 retweets 0 likes
        4. End of conversation

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