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warning: opaque type `impl Trait<Assoc = Sendable>` does not satisfy its associated type bounds
--> $DIR/nested-return-type3-tait.rs:19:24
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LL | type Assoc: Duh;
| --- this associated type bound is unsatisfied for `Sendable`
...
LL | fn foo() -> impl Trait<Assoc = Sendable> {
| ^^^^^^^^^^^^^^^^
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= note: `#[warn(opaque_hidden_inferred_bound)]` on by default
help: add this bound
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LL | type Sendable = impl Send + Duh;
| +++++
warning: 1 warning emitted
|