src/test/ui/error-codes/E0746.stderr

   1 error[E0746]: return type cannot have an unboxed trait object
   2   --> $DIR/E0746.rs:8:13
   3    |
   4 LL | fn foo() -> dyn Trait { Struct }
   5    |             ^^^^^^^^^ doesn't have a size known at compile-time
   6    |
   7    = note: for information on `impl Trait`, see <https://doc.rust-lang.org/book/ch10-02-traits.html#returning-types-that-implement-traits>
   8 help: use `impl Trait` as the return type, as all return paths are of type `Struct`, which implements `Trait`
   9    |
  10 LL | fn foo() -> impl Trait { Struct }
  11    |             ~~~~~~~~~~
  12
  13 error[E0746]: return type cannot have an unboxed trait object
  14   --> $DIR/E0746.rs:11:13
  15    |
  16 LL | fn bar() -> dyn Trait {
  17    |             ^^^^^^^^^ doesn't have a size known at compile-time
  18    |
  19    = note: for information on `impl Trait`, see <https://doc.rust-lang.org/book/ch10-02-traits.html#returning-types-that-implement-traits>
  20 help: use `impl Trait` as the return type, as all return paths are of type `{integer}`, which implements `Trait`
  21    |
  22 LL | fn bar() -> impl Trait {
  23    |             ~~~~~~~~~~
  24
  25 error: aborting due to 2 previous errors
  26
  27 For more information about this error, try `rustc --explain E0746`.