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31 lines
772 B
Rust
31 lines
772 B
Rust
//@ compile-flags: -Znext-solver
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//@ check-pass
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// Normalizing `<T as Trait>::TraitAssoc` in the elaborated environment
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// `[T: Trait, T: Super, <T as Super>::SuperAssoc = <T as Trait>::TraitAssoc]`
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// has a single impl candidate, which uses the environment to
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// normalize `<T as Trait>::TraitAssoc` to itself. We avoid this overflow
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// by discarding impl candidates the trait bound is proven by a where-clause.
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// https://github.com/rust-lang/trait-system-refactor-initiative/issues/76
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trait Super {
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type SuperAssoc;
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}
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trait Trait: Super<SuperAssoc = Self::TraitAssoc> {
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type TraitAssoc;
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}
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impl<T, U> Trait for T
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where
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T: Super<SuperAssoc = U>,
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{
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type TraitAssoc = U;
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}
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fn overflow<T: Trait>() {
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let x: <T as Trait>::TraitAssoc;
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}
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fn main() {}
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