1 error[E0374]: the trait `CoerceUnsized` may only be implemented for a coercion between structures with one field being coerced, none found
4 LL | impl<T, U> CoerceUnsized<Foo<U>> for Foo<T>
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
7 error: aborting due to previous error
9 For more information about this error, try `rustc --explain E0374`.