error[E0228]: the lifetime bound for this object type cannot be deduced from context; please supply an explicit bound
  --> $DIR/object-lifetime-default-dyn-binding-nonstatic2.rs:20:50
   |
LL | fn bar<'a>(x: &'a str) -> &'a dyn Foo<'a, Item = dyn Bar> { &() }
   |                                                  ^^^^^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0228`.