error[E0277]: `PhantomPinned` cannot be unpinned
  --> tests/ui/pin_project/add-pinned-field.rs:21:5
   |
21 |     is_unpin::<Foo>(); //~ ERROR E0277
   |     ^^^^^^^^^^^^^^^ within `__Foo<'_>`, the trait `Unpin` is not implemented for `PhantomPinned`
   |
   = note: consider using `Box::pin`
note: required because it appears within the type `__Foo<'_>`
  --> tests/ui/pin_project/add-pinned-field.rs:8:8
   |
8  | struct Foo {
   |        ^^^
note: required because of the requirements on the impl of `Unpin` for `Foo`
  --> tests/ui/pin_project/add-pinned-field.rs:6:1
   |
6  | #[pin_project]
   | ^^^^^^^^^^^^^^
7  | #[add_pinned_field]
8  | struct Foo {
   |        ^^^
note: required by a bound in `is_unpin`
  --> tests/ui/pin_project/add-pinned-field.rs:4:16
   |
4  | fn is_unpin<T: Unpin>() {}
   |                ^^^^^ required by this bound in `is_unpin`
   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0277]: `PhantomPinned` cannot be unpinned
  --> tests/ui/pin_project/add-pinned-field.rs:22:5
   |
22 |     is_unpin::<Bar>(); //~ ERROR E0277
   |     ^^^^^^^^^^^^^^^ within `__Bar<'_>`, the trait `Unpin` is not implemented for `PhantomPinned`
   |
   = note: consider using `Box::pin`
note: required because it appears within the type `__Bar<'_>`
  --> tests/ui/pin_project/add-pinned-field.rs:15:8
   |
15 | struct Bar {
   |        ^^^
note: required because of the requirements on the impl of `Unpin` for `Bar`
  --> tests/ui/pin_project/add-pinned-field.rs:14:1
   |
14 | #[pin_project]
   | ^^^^^^^^^^^^^^
15 | struct Bar {
   |        ^^^
note: required by a bound in `is_unpin`
  --> tests/ui/pin_project/add-pinned-field.rs:4:16
   |
4  | fn is_unpin<T: Unpin>() {}
   |                ^^^^^ required by this bound in `is_unpin`
   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)