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error[E0038]: the trait `Foo` cannot be made into an object
  --> $DIR/object-safety-err-ret.rs:17:15
   |
LL | fn use_dyn(v: &dyn Foo) {
   |               ^^^^^^^^ `Foo` cannot be made into an object
   |
   = help: consider moving `test` to another trait
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/object-safety-err-ret.rs:8:23
   |
LL | trait Foo {
   |       --- this trait cannot be made into an object...
LL |     fn test(&self) -> [u8; bar::<Self>()];
   |                       ^^^^^^^^^^^^^^^^^^^ ...because method `test` references the `Self` type in its return type

error: aborting due to previous error

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