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use pin_project::{pin_project, UnsafeUnpin};
use std::marker::PhantomPinned;
fn is_unpin<T: Unpin>() {}
#[pin_project(UnsafeUnpin)]
struct Blah<T, U> {
field1: U,
#[pin]
field2: T,
}
unsafe impl<T: Unpin, U> UnsafeUnpin for Blah<T, U> {}
#[pin_project(UnsafeUnpin)]
struct TrivialBounds {
#[pin]
field1: PhantomPinned,
}
#[pin_project(UnsafeUnpin)]
struct OverlappingLifetimeNames<'pin, T, U> {
#[pin]
field1: U,
#[pin]
field2: Option<T>,
field3: &'pin (),
}
unsafe impl<T: Unpin, U: Unpin> UnsafeUnpin for OverlappingLifetimeNames<'_, T, U> {}
fn main() {
is_unpin::<Blah<PhantomPinned, ()>>(); //~ ERROR E0277
is_unpin::<Blah<(), PhantomPinned>>(); // Ok
is_unpin::<Blah<PhantomPinned, PhantomPinned>>(); //~ ERROR E0277
is_unpin::<TrivialBounds>(); //~ ERROR E0277
is_unpin::<OverlappingLifetimeNames<'_, PhantomPinned, ()>>(); //~ ERROR E0277
is_unpin::<OverlappingLifetimeNames<'_, (), PhantomPinned>>(); //~ ERROR E0277
}
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