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use std::marker::PhantomPinned;
use pin_project::pin_project;
#[pin_project]
struct S<T> {
#[pin]
f: T,
}
struct __S {}
impl Unpin for __S {}
fn is_unpin<T: Unpin>() {}
fn main() {
is_unpin::<S<PhantomPinned>>(); //~ ERROR E0277
}