26 lines
814 B
Rust
26 lines
814 B
Rust
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//@ compile-flags: -Znext-solver
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//@ ignore-compare-mode-next-solver (explicit revisions)
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#![allow(unconditional_recursion)]
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// Regression test for trait-system-refactor-initiative#205. Avoid
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// constraining other impl arguments when applying blanket impls,
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// especially if the nested where-bounds of the blanket impl don't
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// actually apply for the opaque.
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// FIXME(-Znext-solver): This currently incompletely constrains the
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// argument of `opaque: Trait<?x>` using the blanket impl of trait.
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// Ideally we don't do that.
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trait Trait<T> {}
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impl<T: Copy> Trait<u32> for T {}
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impl Trait<u64> for String {}
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fn impls_trait<T: Trait<U>, U>(_: T) {}
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fn test() -> impl Sized {
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let x = test();
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impls_trait(x); //~ ERROR the trait bound `String: Trait<u32>` is not satisfied
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String::new()
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}
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fn main() {}
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