23 lines
622 B
Rust
23 lines
622 B
Rust
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// compile-flags: -Ztrait-solver=next
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// check-pass
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trait Foo {}
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impl<T> Foo for T {}
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trait Bar {}
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struct Wrapper<'a, T>(&'a T);
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impl<'a, T> Bar for Wrapper<'a, T> where &'a T: Foo {}
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// We need to satisfy `&'a T: Foo` when checking that this impl is WF
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// that can either be satisfied via the param-env, or via an impl.
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//
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// When satisfied via the param-env, since each lifetime is canonicalized
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// separately, we end up getting extra region constraints.
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//
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// However, when satisfied via the impl, there are no region constraints,
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// and we can short-circuit a response with no external constraints.
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fn main() {}
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