| error[E0038]: the trait `Foo` is not dyn compatible |
| --> $DIR/dyn-compatibility.rs:14:41 |
| | |
| LL | let i = Box::new(42_u32) as Box<dyn Foo>; |
| | ^^^ `Foo` is not dyn compatible |
| | |
| note: for a trait to be dyn compatible it needs to allow building a vtable |
| for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility> |
| --> $DIR/dyn-compatibility.rs:4:22 |
| | |
| LL | trait Foo { |
| | --- this trait is not dyn compatible... |
| LL | fn baz(&self) -> impl Debug; |
| | ^^^^^^^^^^ ...because method `baz` references an `impl Trait` type in its return type |
| = help: consider moving `baz` to another trait |
| = help: only type `u32` implements `Foo`; consider using it directly instead. |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0038`. |
