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#![deny(unused_must_use)]
use std::{ops::Deref, pin::Pin};
#[must_use]
struct MustUse;
#[must_use]
struct MustUsePtr<'a, T>(&'a T);
impl<'a, T> Deref for MustUsePtr<'a, T> {
type Target = T;
fn deref(&self) -> &Self::Target {
self.0
}
}
fn pin_ref() -> Pin<&'static ()> {
Pin::new(&())
}
fn pin_ref_mut() -> Pin<&'static mut ()> {
Pin::new(unimplemented!())
}
fn pin_must_use_ptr() -> Pin<MustUsePtr<'static, ()>> {
Pin::new(MustUsePtr(&()))
}
fn pin_box() -> Pin<Box<()>> {
Box::pin(())
}
fn pin_box_must_use() -> Pin<Box<MustUse>> {
Box::pin(MustUse)
}
fn main() {
pin_ref();
pin_ref_mut();
pin_must_use_ptr(); //~ ERROR unused pinned `MustUsePtr` that must be used
pin_box();
pin_box_must_use(); //~ ERROR unused pinned boxed `MustUse` that must be used
}
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