Implement #[rustc_default_body_unstable]
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src/test/ui/stability-attribute/default-body-stability-err.stderr
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☔ The latest upstream changes (presumably #97177) made this pull request unmergeable. Please resolve the merge conflicts. |
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Ping from triage: |
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danielhenrymantilla
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☔ The latest upstream changes (presumably #95956) made this pull request unmergeable. Please resolve the merge conflicts. |
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This attribute allows to mark default body of a trait function as
unstable. This means that implementing the trait without implementing
the function will require enabling unstable feature.
This is useful in conjunction with `#[rustc_must_implement_one_of]`,
we may want to relax requirements for a trait, for example allowing
implementing either of `PartialEq::{eq, ne}`, but do so in a safe way
-- making implementation of only `PartialEq::ne` unstable.
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Sorry for the extreme delay - I had forgotten that this was assigned to me. This looks good to me overall - do we need lang-team signoff before adding this? |
Aaron1011
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Jul 29, 2022
I don't know, maybe 😄 |
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r=me after confirmation from the libs teem that this is okay (or after an FCP if needed) |
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@Aaron1011 why libs team approval is needed? This PR doesn't change any library APIs after all. Quoting
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@bors r+ |
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Rollup of 7 pull requests Successful merges: - rust-lang#96478 (Implement `#[rustc_default_body_unstable]`) - rust-lang#99787 (Rustdoc-Json: Document HRTB's on DynTrait) - rust-lang#100181 (add method to get the mutability of an AllocId) - rust-lang#100221 (Don't document impossible to call default trait items on impls) - rust-lang#100228 (Don't ICE while suggesting updating item path.) - rust-lang#100301 (Avoid `&str` to `String` conversions) - rust-lang#100305 (Suggest adding an appropriate missing pattern excluding comments) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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This PR implements a new stability attribute —
#[rustc_default_body_unstable].#[rustc_default_body_unstable]controls the stability of default bodies in traits.For example:
In order to implement
Traituser needs to eitheritem(even though it has a default implementation)#![feature(feat)]This is useful in conjunction with
#[rustc_must_implement_one_of], we may want to relax requirements for a trait, for example allowing implementing either ofPartialEq::{eq, ne}, but do so in a safe way — making implementation of onlyPartialEq::neunstable.r? @Aaron1011
cc @nrc (iirc you were interested in this wrt
read_buf), @danielhenrymantilla (you were interested in the related#[rustc_must_implement_one_of])P.S. This is my first time working with stability attributes, so I'm not sure if I did everything right 😅