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