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36 lines
999 B
Rust
36 lines
999 B
Rust
//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[next] compile-flags: -Znext-solver
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//@[next] known-bug: #92505
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//@[current] check-pass
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trait Trait {
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type Assoc;
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}
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impl<T> Trait for T {
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type Assoc = T;
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}
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fn impls_trait<T: Trait>() {}
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fn foo<T>()
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where
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<T as Trait>::Assoc: Trait,
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{
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// Trying to use `<T as Trait>::Assoc: Trait` to prove `T: Trait`
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// requires normalizing `<T as Trait>::Assoc`. We do not normalize
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// using impl candidates if there's a where-bound for that trait.
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//
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// We therefore check whether `T: Trait` is proven by the environment.
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// For that we try to apply the `<T as Trait>::Assoc: Trait` candidate,
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// trying to normalize its self type results in overflow.
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//
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// In the old solver we eagerly normalize the environment, ignoring the
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// unnormalized `<T as Trait>::Assoc: Trait` where-bound when normalizing
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// `<T as Trait>::Asosc`
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impls_trait::<T>();
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}
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fn main() {}
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