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ekuber's profile
Esteban K 🦀⚙️
Esteban K 🦀⚙️
Esteban K  🦀 ⚙️
@ekuber

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Esteban K  🦀 ⚙️

@ekuber

"We spent decades trying to invent a sufficiently smart compiler when we should have been inventing a sufficiently empathetic one" he/him

San Francisco, CA
Joined January 2010

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    Esteban K  🦀 ⚙️‏ @ekuber Jan 26
    • Report Tweet

    Lazy @rustlang Twitter: can you send me snippets of code where you *needed* higher kinded lifetimes? I wish to identify as many cases as possible to categorize them and make rustc understand them and guide you in their direction.

    11:31 AM - 26 Jan 2020
    • 22 Retweets
    • 62 Likes
    • Ayaka Andrew Cotter Piku- Michael J Ward Byron Gibson Andrew McHarg MBL Bruce Gowtham OZ
    11 replies 22 retweets 62 likes
      1. Esteban K  🦀 ⚙️‏ @ekuber Jan 26
        • Report Tweet

        Even better if you can also show me the road you took to reach the understanding that HKLT 1) were a thing and 2) you needed to use them.

        4 replies 1 retweet 9 likes
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      1. New conversation
      2. Félix Fischer‏ @FelixFischer91 Jan 26
        • Report Tweet
        Replying to @ekuber @rustlang

        Wait, what *are* HKLT? Can you point me to some resources? They sound mightily interesting.

        1 reply 0 retweets 1 like
      3. Esteban K  🦀 ⚙️‏ @ekuber Jan 26
        • Report Tweet
        Replying to @FelixFischer91 @rustlang

        https://doc.rust-lang.org/reference/trait-bounds.html#higher-ranked-trait-bounds … https://doc.rust-lang.org/nomicon/hrtb.html … https://stackoverflow.com/questions/35592750/how-does-for-syntax-differ-from-a-regular-lifetime-bound … It's the `for<'a> fn(&'a T) -> &'a K` syntax, so that you can pass around closures that have borrows that are related to its inputs, but detached to the current Item context.

        1 reply 0 retweets 8 likes
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      2. Manish‏ @ManishEarth Jan 26
        • Report Tweet
        Replying to @ekuber @rustlang

        i don't have examples on me but in stylo we almost needed them due to a lack of GATs with lifetimes (you can hack it with for<'a> Trait<'a>)

        2 replies 0 retweets 8 likes
      3. Esteban K  🦀 ⚙️‏ @ekuber Jan 26
        • Report Tweet
        Replying to @ManishEarth @rustlang

        That is precisely the kind of out of the left field use I want to hear about!

        0 replies 0 retweets 5 likes
      4. End of conversation
      1. New conversation
      2. David Tolnay‏ @davidtolnay Jan 26
        • Report Tweet
        Replying to @ekuber @rustlang

        I think you are asking about higher *ranked*, not higher *kinded* which are a different thing. Primer: https://www.stephanboyer.com/post/115/higher-rank-and-higher-kinded-types …

        1 reply 0 retweets 6 likes
      3. David Tolnay‏ @davidtolnay Jan 26
        • Report Tweet
        Replying to @davidtolnay @ekuber @rustlang

        Higher kinded would be a lifetime from lifetimes to lifetimes (??). Higher ranked would be a "for any" lifetime.

        1 reply 0 retweets 9 likes
      4. 1 more reply
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      2. David Barsky‏ @endsofthreads Jan 26
        • Report Tweet
        Replying to @ekuber @rustlang

        We needed them in `tracing` (https://github.com/tokio-rs/tracing/blob/master/tracing-subscriber/src/fmt/fmt_layer.rs#L388-L393 …), especially the `LookupSpan` bounds. I don't recall _why_ we ended up needing them; I think @mycoliza short-circuited that search process for me.

        1 reply 0 retweets 4 likes
      3. electronic liza‏ @mycoliza Jan 26
        • Report Tweet
        Replying to @endsofthreads @ekuber @rustlang

        the trait methods return a struct with a reference to the receiver in it; we need HRTB so that we can bound a generic type parameter with that trait without also being generic over the lifetime

        2 replies 0 retweets 5 likes
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      2. Tyler Mandry‏ @tmandry Jan 26
        • Report Tweet
        Replying to @ekuber @rustlang

        IME, it’s most frequently used for function pointers and Fn* bounds

        1 reply 0 retweets 2 likes
      3. o0Ignition0o‏ @o0ignition0o Jan 26
        • Report Tweet
        Replying to @tmandry @ekuber @rustlang

        I read it Fn starbound and it just made my day.pic.twitter.com/IWjpjokeRC

        0 replies 0 retweets 2 likes
      4. End of conversation

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