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+error[E0038]: the trait `Foo` cannot be made into an object
+ --> $DIR/object-safety.rs:20:33
+ |
+LL | let i = Box::new(42_u32) as Box<dyn Foo>;
+ | ^^^^^^^^^^^^ `Foo` cannot be made into an object
+ |
+note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+ --> $DIR/object-safety.rs:10:22
+ |
+LL | trait Foo {
+ | --- this trait cannot be made into an object...
+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
+
+error[E0038]: the trait `Foo` cannot be made into an object
+ --> $DIR/object-safety.rs:23:13
+ |
+LL | let s = i.baz();
+ | ^^^^^^^ `Foo` cannot be made into an object
+ |
+note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+ --> $DIR/object-safety.rs:10:22
+ |
+LL | trait Foo {
+ | --- this trait cannot be made into an object...
+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
+
+error[E0038]: the trait `Foo` cannot be made into an object
+ --> $DIR/object-safety.rs:20:13
+ |
+LL | let i = Box::new(42_u32) as Box<dyn Foo>;
+ | ^^^^^^^^^^^^^^^^ `Foo` cannot be made into an object
+ |
+note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+ --> $DIR/object-safety.rs:10:22
+ |
+LL | trait Foo {
+ | --- this trait cannot be made into an object...
+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
+ = note: required for `Box<u32>` to implement `CoerceUnsized<Box<dyn Foo>>`
+ = note: required by cast to type `Box<dyn Foo>`
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0038`.