1 // NB: If you change this test, change 'marker_trait_attr-feature-gate.rs' at the same time. 2 3 // marker_trait_attr 4 // Tracking issue: https://github.com/rust-lang/rust/issues/29864 5 #![feature(marker_trait_attr)] 6 7 // See https://github.com/taiki-e/pin-project/issues/105#issuecomment-535355974 8 9 use pin_project::pin_project; 10 use std::marker::PhantomPinned; 11 12 #[pin_project] //~ ERROR E0119 13 struct Struct<T> { 14 #[pin] 15 x: T, 16 } 17 18 // unsound Unpin impl 19 impl<T> Unpin for Struct<T> {} 20 is_unpin<T: Unpin>()21fn is_unpin<T: Unpin>() {} 22 main()23fn main() { 24 is_unpin::<Struct<PhantomPinned>>() 25 } 26