33 lines
1.1 KiB
Rust
33 lines
1.1 KiB
Rust
//@ revisions: old next
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//@[next] compile-flags: -Znext-solver
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// The new trait solver does not return region constraints if the goal
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// is still ambiguous. This should cause the following test to fail with
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// ambiguity as even if `(): LeakCheckFailure<'static, '!b, V>` unifies
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// `'!b` with `'static`, we erase all region constraints.
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//
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// However, we do still unify the var_value for `'b` with `'static`,
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// causing us to return this requirement via the `var_values` even if
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// we don't return any region constraints. This is a bit inconsistent
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// but isn't something we should really worry about imo.
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trait Ambig {}
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impl Ambig for u32 {}
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impl Ambig for u16 {}
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trait Id<T> {}
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impl Id<u32> for u32 {}
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impl Id<u16> for u16 {}
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trait LeakCheckFailure<'a, 'b, V: ?Sized> {}
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impl<'a, 'b: 'a, V: ?Sized + Ambig> LeakCheckFailure<'a, 'b, V> for () {}
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trait Trait<U, V> {}
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impl<V> Trait<u32, V> for () where for<'b> (): LeakCheckFailure<'static, 'b, V> {}
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impl<V> Trait<u16, V> for () {}
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fn impls_trait<T: Trait<U, V>, U: Id<V>, V>() {}
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fn main() {
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impls_trait::<(), _, _>()
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//~^ ERROR type annotations needed
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}
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