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+error[E0053]: method `bar` has an incompatible type for trait
+ --> $DIR/specialization-broken.rs:19:22
+ |
+LL | default impl<U> Foo for U
+ | - this type parameter
+...
+LL | fn bar(&self) -> U {
+ | ^
+ | |
+ | expected associated type, found type parameter `U`
+ | help: change the output type to match the trait: `impl Sized`
+ |
+note: type in trait
+ --> $DIR/specialization-broken.rs:12:22
+ |
+LL | fn bar(&self) -> impl Sized;
+ | ^^^^^^^^^^
+ = note: expected signature `fn(&U) -> impl Sized`
+ found signature `fn(&U) -> U`
+
+error: method with return-position `impl Trait` in trait cannot be specialized
+ --> $DIR/specialization-broken.rs:19:5
+ |
+LL | fn bar(&self) -> U {
+ | ^^^^^^^^^^^^^^^^^^
+ |
+ = note: specialization behaves in inconsistent and surprising ways with `#![feature(return_position_impl_trait_in_trait)]`, and for now is disallowed
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0053`.