mirror of https://github.com/rust-lang/rust
43 lines
1.1 KiB
Rust
43 lines
1.1 KiB
Rust
// Regression test for issue #99554.
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// Projections might not cover type parameters.
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//@ revisions: classic next
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//@[next] compile-flags: -Znext-solver
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//@ check-pass
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//@ compile-flags: --crate-type=lib
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//@ aux-crate:foreign=parametrized-trait.rs
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//@ edition:2021
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trait Identity {
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type Output;
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}
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impl<T> Identity for T {
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type Output = T;
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}
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struct Local;
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impl<T> foreign::Trait0<Local, T, ()> for <T as Identity>::Output {}
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//~^ WARNING type parameter `T` must be covered by another type
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//~| WARNING this was previously accepted by the compiler
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impl<T> foreign::Trait0<<T as Identity>::Output, Local, T> for Option<T> {}
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//~^ WARNING type parameter `T` must be covered by another type
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//~| WARNING this was previously accepted by the compiler
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pub trait Deferred {
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type Output;
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}
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// A downstream user could implement
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//
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// impl<T> Deferred for Type<T> { type Output = T; }
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// struct Type<T>(T);
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//
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impl<T: Deferred> foreign::Trait1<Local, T> for <T as Deferred>::Output {}
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//~^ WARNING type parameter `T` must be covered by another type
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//~| WARNING this was previously accepted by the compiler
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