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use auxiliary_macro::add_pinned_field; use pin_project::pin_project; fn is_unpin<T: Unpin>() {} #[pin_project] #[add_pinned_field] struct Foo { #[pin] f: u32, } #[add_pinned_field] #[pin_project] struct Bar { #[pin] f: u32, } fn main() { is_unpin::<Foo>(); //~ ERROR E0277 is_unpin::<Bar>(); //~ ERROR E0277 }