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error[E0367]: `Drop` impl requires `T: std::marker::Unpin` but the struct it is implemented for does not
  --> $DIR/conditional-drop-impl.rs:10:9
   |
10 | impl<T: Unpin> Drop for DropImpl<T> {
   |         ^^^^^
   |
note: the implementor must specify the same requirement
  --> $DIR/conditional-drop-impl.rs:6:1
   |
6  | / struct DropImpl<T> {
7  | |     field: T,
8  | | }
   | |_^

error[E0277]: `T` cannot be unpinned
  --> $DIR/conditional-drop-impl.rs:15:15
   |
15 | #[pin_project(PinnedDrop)] //~ ERROR E0277
   |               ^^^^^^^^^^ the trait `std::marker::Unpin` is not implemented for `T`
   |
   = note: required because of the requirements on the impl of `pin_project::__private::PinnedDrop` for `PinnedDropImpl<T>`
   = note: required by `pin_project::__private::PinnedDrop::drop`
help: consider restricting type parameter `T`
   |
16 | struct PinnedDropImpl<T: std::marker::Unpin> {
   |                        ^^^^^^^^^^^^^^^^^^^^