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35 lines
571 B
Rust
35 lines
571 B
Rust
// build-pass
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trait Trait { type Item; }
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impl<'a, X> Trait for &'a Vec<X> {
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type Item = &'a X;
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}
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impl<X> Trait for Box<dyn Trait<Item = X>> {
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type Item = X;
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}
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fn make_dyn_trait(_: &()) -> Box<dyn Trait<Item = &()>> {
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todo!()
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}
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fn diff<'a, M, N, S>(_: N, _: S)
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where
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M: 'a,
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N: Trait<Item = &'a M>,
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S: Trait<Item = &'a M>,
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{
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todo!()
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}
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fn may_panic<X>(_: X) { }
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fn main() {
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let dyn_trait = make_dyn_trait(&());
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let storage = vec![()];
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let _x = may_panic(());
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let storage_ref = &storage;
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diff(dyn_trait, storage_ref);
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}
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