File: issue-81809.rs

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rustc 1.87.0%2Bdfsg1-1
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//@ check-pass

pub trait Indexable {
    type Idx;
}
impl Indexable for u8 {
    type Idx = u8;
}
impl Indexable for u16 {
    type Idx = u16;
}

pub trait Indexer<T: Indexable>: std::ops::Index<T::Idx, Output = T> {}

trait StoreIndex: Indexer<u8> + Indexer<u16> {}

fn foo(st: &impl StoreIndex) -> &dyn StoreIndex {
    st as &dyn StoreIndex
}

fn main() {}