1 // NB: If you change this test, change 'overlapping_marker_traits-feature-gate.rs' at the same time.
2 
3 // This feature could break the guarantee for Unpin provided by pin-project,
4 // but was removed in https://github.com/rust-lang/rust/pull/68544 (nightly-2020-02-06).
5 // Refs:
6 // * https://github.com/rust-lang/rust/issues/29864#issuecomment-515780867.
7 // * https://github.com/taiki-e/pin-project/issues/105
8 
9 // overlapping_marker_traits
10 // Tracking issue: https://github.com/rust-lang/rust/issues/29864
11 #![feature(overlapping_marker_traits)]
12 
13 use pin_project::pin_project;
14 use std::marker::PhantomPinned;
15 
16 #[pin_project]
17 struct Struct<T> {
18     #[pin]
19     x: T,
20 }
21 
22 // unsound Unpin impl
23 impl<T> Unpin for Struct<T> {}
24 
is_unpin<T: Unpin>()25 fn is_unpin<T: Unpin>() {}
26 
main()27 fn main() {
28     is_unpin::<Struct<PhantomPinned>>()
29 }
30