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sgrif's profile
Miss Dada 🏳️‍⚧️
Miss Dada 🏳️‍⚧️
Miss Dada  🏳️‍⚧️
@sgrif

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Miss Dada  🏳️‍⚧️

@sgrif

Co lead of the http://crates.io  team. Creator of @dieselframework. Former host of @_bikeshed and @_yakshave. Former Rails comitter. Enby. they/them

Albuquerque, NM
patreon.com/seantheprogram…
Joined November 2008

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    1. alexander payne‏ @myrrlyn Aug 5
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      hey is it UB to transmute initialized bytes into a Rust struct

      6 replies 0 retweets 19 likes
      Show this thread
    2. alexander payne‏ @myrrlyn Aug 5
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      • Report NetzDG Violation

      Rust struct to bytes is UB because padding is considered uninitialized

      3 replies 1 retweet 10 likes
      Show this thread
    3. Em::˂ 🏳️‍⚧️˃‏ @leftpaddotpy Aug 5
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      Replying to @myrrlyn

      Can padding be less than a byte or is the issue that it would be Bad in arrays?

      2 replies 0 retweets 1 like
    4. Miss Dada  🏳️‍⚧️‏ @sgrif Aug 5
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      Replying to @leftpaddotpy @myrrlyn

      Padding that is less than a byte would imply the existence of any types that are less than a byte (but > 0 bytes) in size, which don't exist

      1 reply 0 retweets 2 likes
    5. alexander payne‏ @myrrlyn Aug 5
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      Replying to @sgrif @leftpaddotpy

      😡 so far 😡

      1 reply 0 retweets 1 like
      Miss Dada  🏳️‍⚧️‏ @sgrif Aug 5
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      Replying to @myrrlyn @leftpaddotpy

      Even if you had a sub byte sized type, I don't think it would be possible to leave the remaining bits undefined, since anything & undef = undef and anything | undef = undef

      4:19 PM - 5 Aug 2020
      • 2 Likes
      • alexander payne Em::˂🏳️‍⚧️˃
      1 reply 0 retweets 2 likes
        1. New conversation
        1. alexander payne‏ @myrrlyn Aug 5
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          Replying to @sgrif @leftpaddotpy

          isn't the whole point of llvm `freeze` that `freeze(undef) | !0` is !0

          2 replies 0 retweets 0 likes
        2. Miss Dada  🏳️‍⚧️‏ @sgrif Aug 5
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          Replying to @myrrlyn @leftpaddotpy

          Yes, and once you introduce freeze you no longer have UB when reading from it so the whole problem is moot

          1 reply 0 retweets 2 likes
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