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

   1 error[E0038]: the trait `Trait` cannot be made into an object
   2   --> $DIR/E0038.rs:5:16
   3    |
   4 LL | trait Trait {
   5    |       ----- this trait cannot be made into an object...
   6 LL |     fn foo(&self) -> Self;
   7    |                      ---- ...because method `foo` references the `Self` type in its return type
   8 ...
   9 LL | fn call_foo(x: Box<dyn Trait>) {
  10    |                ^^^^^^^^^^^^^^ the trait `Trait` cannot be made into an object
  11    |
  12    = help: consider moving `foo` to another trait
  13
  14 error: aborting due to previous error
  15
  16 For more information about this error, try `rustc --explain E0038`.