23 lines
664 B
Rust
23 lines
664 B
Rust
// 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(rustc_attrs)]
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#![feature(with_negative_coherence)]
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#[rustc_strict_coherence]
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trait Foo {}
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impl<T> !Foo for &T where T: 'static {}
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#[rustc_strict_coherence]
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trait Bar {}
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impl<T: Foo> Bar for T {}
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impl<T> Bar for &T where T: 'static {}
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fn main() {}
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