Allow restricted trait impls under #[allow_internal_unstable(min_specialization)]
#120870
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Implementing traits marked with `#[rustc_specialization_trait]` normally requires (min-)specialization to be enabled for the enclosing crate. With this change, that permission can also be granted by an `allow_internal_unstable` attribute on the macro that generates the impl.
These crates all needed specialization for `newtype_index!`, which will no longer be necessary when the current nightly eventually becomes the next bootstrap compiler.
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Allow restricted trait impls under `#[allow_internal_unstable(min_specialization)]` This is a follow-up to rust-lang#119963 and a companion to rust-lang#120866, though it can land independently from the latter. --- We have several compiler crates that only enable `#[feature(min_specialization)]` because it is required by their expansions of `newtype_index!`, in order to implement traits marked with `#[rustc_specialization_trait]`. This PR allows those traits to be implemented internally by macros with `#[allow_internal_unstable(min_specialization)]`, without needing specialization to be enabled in the enclosing crate.
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Allow restricted trait impls under `#[allow_internal_unstable(min_specialization)]` This is a follow-up to rust-lang#119963 and a companion to rust-lang#120866, though it can land independently from the latter. --- We have several compiler crates that only enable `#[feature(min_specialization)]` because it is required by their expansions of `newtype_index!`, in order to implement traits marked with `#[rustc_specialization_trait]`. This PR allows those traits to be implemented internally by macros with `#[allow_internal_unstable(min_specialization)]`, without needing specialization to be enabled in the enclosing crate.
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#117614 (static mut: allow mutable reference to arbitrary types, not just slices and arrays) - rust-lang#120588 (wasm: Store rlib metadata in wasm object files) - rust-lang#120719 (Remove support for `associated_type_bound` nested in `dyn` types) - rust-lang#120823 (Clarify that atomic and regular integers can differ in alignment) - rust-lang#120859 (Loosen an assertion to account for stashed errors.) - rust-lang#120865 (Turn the "no saved object file in work product" ICE into a translatable fatal error) - rust-lang#120866 (Remove unnecessary `#![feature(min_specialization)]`) - rust-lang#120870 (Allow restricted trait impls under `#[allow_internal_unstable(min_specialization)]`) r? `@ghost` `@rustbot` modify labels: rollup
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#117614 (static mut: allow mutable reference to arbitrary types, not just slices and arrays) - rust-lang#120719 (Remove support for `associated_type_bound` nested in `dyn` types) - rust-lang#120764 (Add documentation on `str::starts_with`) - rust-lang#120823 (Clarify that atomic and regular integers can differ in alignment) - rust-lang#120859 (Loosen an assertion to account for stashed errors.) - rust-lang#120865 (Turn the "no saved object file in work product" ICE into a translatable fatal error) - rust-lang#120866 (Remove unnecessary `#![feature(min_specialization)]`) - rust-lang#120870 (Allow restricted trait impls under `#[allow_internal_unstable(min_specialization)]`) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#120870 - Zalathar:allow-min-spec, r=oli-obk Allow restricted trait impls under `#[allow_internal_unstable(min_specialization)]` This is a follow-up to rust-lang#119963 and a companion to rust-lang#120866, though it can land independently from the latter. --- We have several compiler crates that only enable `#[feature(min_specialization)]` because it is required by their expansions of `newtype_index!`, in order to implement traits marked with `#[rustc_specialization_trait]`. This PR allows those traits to be implemented internally by macros with `#[allow_internal_unstable(min_specialization)]`, without needing specialization to be enabled in the enclosing crate.
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This is a follow-up to #119963 and a companion to #120866, though it can land independently from the latter.
We have several compiler crates that only enable
#[feature(min_specialization)]because it is required by their expansions ofnewtype_index!, in order to implement traits marked with#[rustc_specialization_trait].This PR allows those traits to be implemented internally by macros with
#[allow_internal_unstable(min_specialization)], without needing specialization to be enabled in the enclosing crate.