src/test/ui/error-codes/E0038.stderr

   1 error[E0038]: the trait `Trait` cannot be made into an object
   2   --> $DIR/E0038.rs:15:1
   3    |
   4 LL | fn call_foo(x: Box<Trait>) {
   5    | ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait` cannot be made into an object
   6    |
   7    = note: method `foo` references the `Self` type in its arguments or return type
   8
   9 error: aborting due to previous error
  10
  11 For more information about this error, try `rustc --explain E0038`.