1 error[E0376]: the trait `CoerceUnsized` may only be implemented for a coercion between structures
4 LL | impl<T, U> CoerceUnsized<U> for Foo<T> {}
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
7 error: aborting due to previous error
9 For more information about this error, try `rustc --explain E0376`.