error[E0120]: the `Drop` trait may only be implemented for local structs, enums, and unions
  --> $DIR/drop-foreign-fundamental.rs:16:15
   |
LL | impl Drop for Pin<Whatever<A>> {
   |               ^^^^^^^^^^^^^^^^ must be a struct, enum, or union in the current crate

error: aborting due to previous error

For more information about this error, try `rustc --explain E0120`.