40 lines
834 B
Rust
40 lines
834 B
Rust
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// Regression test for soundness issue #114061:
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// "Coherence incorrectly considers `unnormalizable_projection: Trait` to not hold even if it could"
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#![crate_type = "lib"]
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trait WhereBound {}
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impl WhereBound for () {}
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pub trait WithAssoc<'a> {
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type Assoc;
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}
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// These two impls of `Trait` overlap:
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pub trait Trait {}
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impl<T> Trait for T
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where
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T: 'static,
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for<'a> T: WithAssoc<'a>,
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for<'a> <T as WithAssoc<'a>>::Assoc: WhereBound,
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{
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}
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impl<T> Trait for Box<T> {} //~ ERROR conflicting implementations of trait `Trait` for type `Box<_>`
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// A downstream crate could write:
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//
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// use upstream::*;
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//
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// struct Local;
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// impl WithAssoc<'_> for Box<Local> {
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// type Assoc = ();
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// }
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//
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// fn impls_trait<T: Trait>() {}
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//
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// fn main() {
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// impls_trait::<Box<Local>>();
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// }
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