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error[E0038]: the trait `Bar` cannot be made into an object
  --> $DIR/issue-28576.rs:7:12
   |
LL | /            dyn Bar
LL | |               <Assoc=()>
   | |________________________^ `Bar` cannot be made into an object
   |
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  --> $DIR/issue-28576.rs:5:16
   |
LL | pub trait Bar: Foo<Assoc=()> {
   |           ---  ^^^^^^^^^^^^^
   |           |    |   |
   |           |    |   ...because it uses `Self` as a type parameter
   |           |    ...because it uses `Self` as a type parameter
   |           this trait cannot be made into an object...

error: aborting due to previous error

For more information about this error, try `rustc --explain E0038`.