error: #[pin_project] attribute may not be used on #[repr(packed)] types
  --> tests/ui/pin_project/packed_sneaky-2.rs:6:1
   |
6  | / hidden_repr_macro! { //~ ERROR may not be used on #[repr(packed)] types
7  | |     #[pin_project]
8  | |     struct B {
9  | |         #[pin]
...  |
12 | | }
   | |_^
   |
   = note: this error originates in the macro `hidden_repr_macro` (in Nightly builds, run with -Z macro-backtrace for more info)