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rustlang's profile
Rust Language
Rust Language
Rust Language
@rustlang

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Rust Language

@rustlang

A programming language empowering everyone to build reliable and efficient software.

rust-lang.org
Joined July 2010

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    1. CAD97‏ @CAD97_ Feb 18
      • Report Tweet
      • Report NetzDG Violation

      Drop order @rustlang poll { let a = PrintOnDrop("a"); a; print!("b"); } print!(" "); { let c = PrintOnDrop("c"); let _ = c; print!("d"); } No checking before answering the poll! This will print:

      17 replies 14 retweets 76 likes
      Show this thread
    2. Judson‏ @judsonlester Feb 19
      • Report Tweet
      • Report NetzDG Violation
      Replying to @CAD97_ @rustlang

      I was mildly surprised, but years with destructors leads me to believe that relying on the sequence of any destructor side effect is folly.

      1 reply 0 retweets 12 likes
    3. CAD97‏ @CAD97_ Feb 19
      • Report Tweet
      • Report NetzDG Violation
      Replying to @judsonlester @rustlang

      Rust has officially committed to stable drop timing, so you are allowed to rely on it. But yeah, just use borrowck to make sure it's right in safe code, and in unsafe code be explicit or at least put a comment explaining what is going on.

      2 replies 0 retweets 4 likes
    4. Socially distant symbols‏ @DreamingInCode Feb 19
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      Replying to @CAD97_ @judsonlester @rustlang

      Has ba/ab changed under NLL? (cd/dc certainly hasn’t)

      1 reply 0 retweets 1 like
      Rust Language‏ @rustlang Feb 19
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      Replying to @DreamingInCode @CAD97_ @judsonlester

      NLL does not change when drop happens (we were worried about a few different things there)

      8:30 AM - 19 Feb 2020
      • 5 Likes
      • David LeGare Yaah 🍑🦀☕ CAD97 Socially distant symbols
      1 reply 0 retweets 5 likes
        1. New conversation
        2. CAD97‏ @CAD97_ Feb 19
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          Replying to @rustlang @DreamingInCode @judsonlester

          Specifically, if a type has drop glue (impls Drop or recursively contains a type that impls Drop), then said drop glue is invoked at the end of scope, and that counts as a use for NLL. NLL only impacts shortening of lifetimes for types which are trivially droppable.

          1 reply 0 retweets 2 likes
        3. CAD97‏ @CAD97_ Feb 19
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          Replying to @CAD97_ @rustlang and

          So apparently there are special rules around some types which are not Drop but contain a Drop type (all public fields?) to make impl Drop less breaking and I give up it's impossible for a human to know all of the drop timing without help from rustc https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=fb84cddc57a60d73ad06d2447b89613d …

          1 reply 0 retweets 1 like
        4. 2 more replies

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