42c00cb647
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`).
44 lines
1.3 KiB
Rust
44 lines
1.3 KiB
Rust
//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[next] compile-flags: -Znext-solver
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#![feature(rustc_attrs)]
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#[rustc_deny_explicit_impl]
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trait NotImplYesObject {}
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#[rustc_deny_explicit_impl]
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#[rustc_do_not_implement_via_object]
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trait NotImplNotObject {}
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#[rustc_do_not_implement_via_object]
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trait YesImplNotObject {}
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#[rustc_do_not_implement_via_object]
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trait YesImplNotObject2 {}
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impl NotImplYesObject for () {}
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//~^ ERROR explicit impls for the `NotImplYesObject` trait are not permitted
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// If there is no automatic impl then we can add a manual impl:
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impl YesImplNotObject2 for dyn YesImplNotObject2 {}
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fn test_not_impl_yes_object<T: NotImplYesObject + ?Sized>() {}
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fn test_not_impl_not_object<T: NotImplNotObject + ?Sized>() {}
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fn test_yes_impl_not_object<T: YesImplNotObject + ?Sized>() {}
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fn test_yes_impl_not_object2<T: YesImplNotObject2 + ?Sized>() {}
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fn main() {
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test_not_impl_yes_object::<dyn NotImplYesObject>();
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test_not_impl_not_object::<dyn NotImplNotObject>();
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//~^ ERROR the trait bound `dyn NotImplNotObject: NotImplNotObject` is not satisfied
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test_yes_impl_not_object::<dyn YesImplNotObject>();
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//~^ ERROR the trait bound `dyn YesImplNotObject: YesImplNotObject` is not satisfied
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test_yes_impl_not_object2::<dyn YesImplNotObject2>();
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}
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