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split up #[rustc_deny_explicit_impl] attribute

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This commit splits the `#[rustc_deny_explicit_impl(implement_via_object = ...)]` attribute
into two attributes `#[rustc_deny_explicit_impl]` and `#[rustc_do_not_implement_via_object]`.

This allows us to have special traits that can have user-defined impls but do not have the
automatic trait impl for trait objects (`impl Trait for dyn Trait`).
This commit is contained in:
Lukas Markeffsky 2024-12-20 16:57:14 +01:00
parent 8a1f8039a7
commit 42c00cb647
13 changed files with 152 additions and 91 deletions
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4
compiler/rustc_middle/src/ty/trait_def.rs
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@ -70,12 +70,12 @@ pub struct TraitDef {
/// Whether to add a builtin `dyn Trait: Trait` implementation.
/// This is enabled for all traits except ones marked with
/// `#[rustc_deny_explicit_impl(implement_via_object = false)]`.
/// `#[rustc_do_not_implement_via_object]`.
pub implement_via_object: bool,
/// Whether a trait is fully built-in, and any implementation is disallowed.
/// This only applies to built-in traits, and is marked via
/// `#[rustc_deny_explicit_impl(implement_via_object = ...)]`.
/// `#[rustc_deny_explicit_impl]`.
pub deny_explicit_impl: bool,
}