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error[E0038]: the trait `Foo` is not dyn compatible
--> $DIR/dyn-compatibility.rs:14:41
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LL | let i = Box::new(42_u32) as Box<dyn Foo>;
| ^^^ `Foo` is not dyn compatible
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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
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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`.
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