error[E0119]: conflicting implementations of trait `MustNotImplDrop` for type `Foo<_, _>`
  --> tests/ui/pin_project/conflict-drop.rs:5:1
   |
5  | / pin_project! { //~ ERROR E0119
6  | |     struct Foo<T, U> {
7  | |         #[pin]
8  | |         future: T,
9  | |         field: U,
10 | |     }
11 | | }
   | | ^
   | | |
   | |_first implementation here
   |   conflicting implementation for `Foo<_, _>`
   |
   = note: this error originates in the macro `$crate::__pin_project_make_drop_impl` which comes from the expansion of the macro `pin_project` (in Nightly builds, run with -Z macro-backtrace for more info)