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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    1. elsie d. soundsystem‏ @mountain_ghosts 6 Jun 2019
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      and it only works for structs, not enums

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    2. elsie d. soundsystem‏ @mountain_ghosts 6 Jun 2019
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      one obvious kind of trait this would not work for is monoids: e.g. Add Foo<T> + Foo<T> should give you another Foo<T>, not a bare T this delegation pattern bubbles up the result from the inner type without wrapping it

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    3. elsie d. soundsystem‏ @mountain_ghosts 6 Jun 2019
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      I really wrote this to get to know the macro system, not because it's a good idea

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    4. elsie d. soundsystem‏ @mountain_ghosts 6 Jun 2019
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      stuff like this is why each trait needs it's own derive rules, if it is derivable

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    5. Box<Pin<Michael<Home>>> + 'corona‏ @mgattozzi 6 Jun 2019
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      Replying to @mountain_ghosts

      PartialEq for one field derive when

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    6. elsie d. soundsystem‏ @mountain_ghosts 6 Jun 2019
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      Replying to @mgattozzi

      what

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    7. Box<Pin<Michael<Home>>> + 'corona‏ @mgattozzi 6 Jun 2019
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      Replying to @mountain_ghosts

      Like r pattern I run into is I'll have some struct A with fields b and c. Except b doesn't impl PartialEq so I can't derive it so I have to write it by hand to match on field c. I just want to go #[derive(PartialEq (c))] and have it work. It's a pattern that's derivable

      2 replies 0 retweets 1 like
    8. elsie d. soundsystem‏ @mountain_ghosts 6 Jun 2019
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      Replying to @mgattozzi

      ah right yes this macro lets you write delegate_trait!(PartialEq, A => c)

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    9. Box<Pin<Michael<Home>>> + 'corona‏ @mgattozzi 6 Jun 2019
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      Replying to @mountain_ghosts

      Yeah! That's exactly what I want!

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    10. elsie d. soundsystem‏ @mountain_ghosts 6 Jun 2019
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      Replying to @mgattozzi

      now I need to know how to write it as an attribute rather than a proc-macro

      2 replies 0 retweets 1 like
      yosh‏ @yoshuawuyts 6 Jun 2019
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      Replying to @mountain_ghosts @mgattozzi

      A few pointers that might be helpful: - https://astexplorer.net/  can be used to explore Rust - the syn + quote + proc-macro2 crates are generally useful (and usually require flags to be turned on to be useful!) - if things end up looking wild, that's okay:https://github.com/yoshuawuyts/context-attribute/blob/master/src/lib.rs#L108-L116 …

      11:44 AM - 6 Jun 2019
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        1. yosh‏ @yoshuawuyts 6 Jun 2019
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          Replying to @yoshuawuyts @mountain_ghosts @mgattozzi

          Oh also, proc macro crates need to be marked as such in Cargo.toml, can only export proc macros, and everything has to live in a single file. And re-exporting proc macros from another crate will always look like "re-export foo from bar" even if you use `#[doc(inline)]`.

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