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Rollup merge of #151783 - mu001999-contrib:impl/final-method, r=fee1-dead

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Implement RFC 3678: Final trait methods

Tracking: https://github.com/rust-lang/rust/issues/131179

This PR is based on rust-lang/rust#130802, with some minor changes and conflict resolution.

Futhermore, this PR excludes final methods from the vtable of a dyn Trait.

And some excerpt from the original PR description:
> Implements the surface part of https://github.com/rust-lang/rfcs/pull/3678.
>
> I'm using the word "method" in the title, but in the diagnostics and the feature gate I used "associated function", since that's more accurate.

cc @joshtriplett
This commit is contained in:
Stuart Cook 2026-02-17 13:02:21 +11:00 • committed by GitHub
commit 1367126837
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57 changed files with 755 additions and 117 deletions
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2
compiler/rustc_feature/src/unstable.rs
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@ -494,6 +494,8 @@ declare_features! (
(unstable, ffi_const, "1.45.0", Some(58328)),
/// Allows the use of `#[ffi_pure]` on foreign functions.
(unstable, ffi_pure, "1.45.0", Some(58329)),
/// Allows marking trait functions as `final` to prevent overriding impls
(unstable, final_associated_functions, "CURRENT_RUSTC_VERSION", Some(1)),
/// Controlling the behavior of fmt::Debug
(unstable, fmt_debug, "1.82.0", Some(129709)),
/// Allows using `#[align(...)]` on function items