| error[E0374]: the trait `CoerceUnsized` may only be implemented for a coercion between structures with one field being coerced, none found | |
| --> $DIR/E0374.rs:8:1 | |
| | | |
| LL | / impl<T, U> CoerceUnsized<Foo<U>> for Foo<T> | |
| LL | | where T: CoerceUnsized<U> {} | |
| | |________________________________^ | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0374`. |