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warning: opaque type `Traitable` does not satisfy its associated type bounds
  --> $DIR/nested-return-type2-tait3.rs:20:29
   |
LL |     type Assoc: Duh;
   |                 --- this associated type bound is unsatisfied for `impl Send`
...
LL | type Traitable = impl Trait<Assoc = impl Send>;
   |                             ^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(opaque_hidden_inferred_bound)]` on by default
help: add this bound
   |
LL | type Traitable = impl Trait<Assoc = impl Send + Duh>;
   |                                               +++++

warning: 1 warning emitted