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https://github.com/rust-lang/rust
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43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
//@ revisions: old next
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//@[next] compile-flags: -Znext-solver=coherence
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//@ check-pass
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// Regression test for issue #90662
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// Tests that projection caching does not cause a spurious error.
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// Coherence relies on the following overflowing goal to still constrain
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// `?0` to `dyn Service`.
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//
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// Projection(<ServiceImpl as Provider<TestModule>>::Interface. ?0)
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//
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// cc https://github.com/rust-lang/trait-system-refactor-initiative/issues/70.
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trait HasProvider<T: ?Sized> {}
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trait Provider<M> {
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type Interface: ?Sized;
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}
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trait Repository {}
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trait Service {}
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struct DbConnection;
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impl<M> Provider<M> for DbConnection {
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type Interface = DbConnection;
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}
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struct RepositoryImpl;
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impl<M: HasProvider<DbConnection>> Provider<M> for RepositoryImpl {
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type Interface = dyn Repository;
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}
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struct ServiceImpl;
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impl<M: HasProvider<dyn Repository>> Provider<M> for ServiceImpl {
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type Interface = dyn Service;
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}
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struct TestModule;
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impl HasProvider<<DbConnection as Provider<Self>>::Interface> for TestModule {}
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impl HasProvider<<RepositoryImpl as Provider<Self>>::Interface> for TestModule {}
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impl HasProvider<<ServiceImpl as Provider<Self>>::Interface> for TestModule {}
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fn main() {}
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