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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. Yaah  🦀‏ @yaahc_ May 12
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      Replying to @sgrif @klaehnr @rustlang

      Oh yea you need a concrete impl don't you, I forgot the From<T> doesn't work as a coersion site for dyn Error.

      1 reply 0 retweets 0 likes
    2. Yaah  🦀‏ @yaahc_ May 12
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      Replying to @yaahc_ @sgrif and

      Either way, you can't meaningfully get what @klaehnr wants which is presumably a catch all error type via Arc that itself impls Error. Side question, Sian do you know if specialization is planned to allow overlap?

      2 replies 0 retweets 0 likes
    3. Miss Dada  🏳️‍⚧️‏ @sgrif May 12
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      Replying to @yaahc_ @klaehnr @rustlang

      You definitely could write `impl<E: Error + ?Sized> Error for Arc<E>`.There's nothing incoherent about it.

      1 reply 0 retweets 1 like
    4. Yaah  🦀‏ @yaahc_ May 12
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      Replying to @sgrif @klaehnr @rustlang

      Yaah  🦀 Retweeted Yaah  🦀

      https://twitter.com/yaahc_/status/1260287021395800066?s=19 …

      Yaah  🦀 added,

      Yaah  🦀 @yaahc_
      Replying to @yaahc_ @klaehnr @rustlang
      That said, Arc should be able to impl Error in the same way Box does, which is to say `impl<E: Sized + Error> Error for Arc<E>`.
      1 reply 0 retweets 0 likes
    5. Miss Dada  🏳️‍⚧️‏ @sgrif May 12
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      Replying to @yaahc_ @klaehnr @rustlang

      The `Sized` bound doesn't need to be there

      1 reply 0 retweets 1 like
    6. Miss Dada  🏳️‍⚧️‏ @sgrif May 12
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      Replying to @sgrif @yaahc_ and

      Or rather could be `?Sized`

      2 replies 0 retweets 0 likes
    7. Ingvar Stepanyan‏ @RReverser May 12
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      Replying to @sgrif @yaahc_ and

      But it will match `dyn Error`, resulting in same conflict again.

      1 reply 0 retweets 1 like
    8. Miss Dada  🏳️‍⚧️‏ @sgrif May 12
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      Replying to @RReverser @yaahc_ and

      Match `dyn Error` for what?

      1 reply 0 retweets 1 like
    9. Ingvar Stepanyan‏ @RReverser May 12
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      Replying to @sgrif @yaahc_ and

      Ingvar Stepanyan Retweeted Yaah  🦀

      https://twitter.com/yaahc_/status/1260286541147959299 …

      Ingvar Stepanyan added,

      Yaah  🦀 @yaahc_
      Replying to @klaehnr @rustlang
      Arc<dyn Error> and Box<dyn Error> cannot impl Error due to the overlap rule which says currently in rust you cannot have two generic trait impls both be valid for the same type. From<T> for Arc<T> and From<T> for T would overlap if Arc<dyn Error> itself could coerce to dyn Error
      1 reply 0 retweets 1 like
    10. Miss Dada  🏳️‍⚧️‏ @sgrif May 12
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      Replying to @RReverser @yaahc_ and

      Those don't overlap and wouldn't ever though. The issue with Box is `impl<E: Error + ?Sized> From<E> for Box<dyn Error>`. There is no such impl for Arc. https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=36eb504e655f8b8a8bf9ffa80fee98cb …

      2 replies 0 retweets 1 like
      Miss Dada  🏳️‍⚧️‏ @sgrif May 12
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      Replying to @sgrif @RReverser and

      Being able to coerce to `dyn Trait` doesn't make your type the same as `dyn Trait`. Even if they did, this would never cause `From` to overlap since `From` requires sized on both the type parameter and the implementor

      2:17 PM - 12 May 2020
      • 1 Like
      • Yaah 🦀
      0 replies 0 retweets 1 like

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