30 lines
755 B
Rust
30 lines
755 B
Rust
// revisions: any_lt static_lt
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//[static_lt] known-bug: unknown
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// This fails because we currently perform negative coherence in coherence mode.
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// This means that when looking for a negative predicate, we also assemble a
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// coherence-unknowable predicate. Since confirming the negative impl has region
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// obligations, we don't prefer the impl over the unknowable predicate
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// unconditionally and instead flounder.
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#![feature(negative_impls)]
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#![feature(with_negative_coherence)]
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trait Foo {}
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impl<T> !Foo for &'static T {}
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trait Bar {}
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impl<T> Bar for T where T: Foo {}
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#[cfg(any_lt)]
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impl<T> Bar for &T {}
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//[any_lt]~^ ERROR conflicting implementations of trait `Bar` for type `&_`
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#[cfg(static_lt)]
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impl<T> Bar for &'static T {}
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fn main() {}
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