24 lines
620 B
Rust
24 lines
620 B
Rust
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//@ check-pass
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#![feature(adt_const_params)]
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//~^ WARN the feature `adt_const_params` is incomplete
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#![feature(with_negative_coherence, negative_impls)]
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pub trait A<const K: &'static str> {}
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pub trait C {}
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struct W<T>(T);
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// Negative coherence:
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// Proving `W<!T>: !A<"">` requires proving `CONST alias-eq ""`, which requires proving
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// `CONST normalizes-to (?1c: &str)`. The type's region is uniquified, so it ends up being
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// put in to the canonical vars list with an infer region => ICE.
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impl<T> C for T where T: A<""> {}
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impl<T> C for W<T> {}
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impl<T> !A<CONST> for W<T> {}
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const CONST: &str = "";
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fn main() {}
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