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126 lines
4.0 KiB
126 lines
4.0 KiB
// Original code (./not_unpin.rs):
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//
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// ```rust
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// #![allow(dead_code)]
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//
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// use pin_project::pin_project;
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//
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// #[pin_project(!Unpin)]
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// pub struct Struct<T, U> {
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// #[pin]
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// pinned: T,
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// unpinned: U,
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// }
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//
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// fn main() {
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// fn _is_unpin<T: Unpin>() {}
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// // _is_unpin::<Struct<(), ()>>(); //~ ERROR `std::marker::PhantomPinned` cannot be unpinned
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// }
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// ```
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#![allow(dead_code, unused_imports, unused_parens, unknown_lints, renamed_and_removed_lints)]
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#![allow(clippy::needless_lifetimes)]
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use pin_project::pin_project;
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// #[pin_project(!Unpin)]
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pub struct Struct<T, U> {
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// #[pin]
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pinned: T,
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unpinned: U,
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}
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const _: () = {
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pub(crate) struct __StructProjection<'pin, T, U>
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where
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Struct<T, U>: 'pin,
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{
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pinned: ::pin_project::__private::Pin<&'pin mut (T)>,
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unpinned: &'pin mut (U),
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}
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pub(crate) struct __StructProjectionRef<'pin, T, U>
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where
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Struct<T, U>: 'pin,
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{
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pinned: ::pin_project::__private::Pin<&'pin (T)>,
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unpinned: &'pin (U),
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}
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impl<T, U> Struct<T, U> {
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pub(crate) fn project<'pin>(
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self: ::pin_project::__private::Pin<&'pin mut Self>,
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) -> __StructProjection<'pin, T, U> {
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unsafe {
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let Self { pinned, unpinned } = self.get_unchecked_mut();
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__StructProjection {
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pinned: ::pin_project::__private::Pin::new_unchecked(pinned),
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unpinned,
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}
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}
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}
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pub(crate) fn project_ref<'pin>(
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self: ::pin_project::__private::Pin<&'pin Self>,
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) -> __StructProjectionRef<'pin, T, U> {
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unsafe {
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let Self { pinned, unpinned } = self.get_ref();
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__StructProjectionRef {
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pinned: ::pin_project::__private::Pin::new_unchecked(pinned),
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unpinned,
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}
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}
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}
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}
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// Ensure that it's impossible to use pin projections on a #[repr(packed)]
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// struct.
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//
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// See ./struct-default-expanded.rs and https://github.com/taiki-e/pin-project/pull/34
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// for details.
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#[forbid(safe_packed_borrows)]
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fn __assert_not_repr_packed<T, U>(this: &Struct<T, U>) {
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let _ = &this.pinned;
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let _ = &this.unpinned;
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}
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// Create `Unpin` impl that has trivial `Unpin` bounds.
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//
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// See https://github.com/taiki-e/pin-project/issues/102#issuecomment-540472282
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// for details.
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impl<'pin, T, U> ::pin_project::__private::Unpin for Struct<T, U> where
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::pin_project::__private::Wrapper<'pin, ::pin_project::__private::PhantomPinned>:
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::pin_project::__private::Unpin
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{
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}
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// A dummy impl of `UnsafeUnpin`, to ensure that the user cannot implement it.
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//
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// To ensure that users don't accidentally write a non-functional `UnsafeUnpin`
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// impls, we emit one ourselves. If the user ends up writing an `UnsafeUnpin`
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// impl, they'll get a "conflicting implementations of trait" error when
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// coherence checks are run.
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#[doc(hidden)]
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unsafe impl<'pin, T, U> ::pin_project::UnsafeUnpin for Struct<T, U> where
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::pin_project::__private::Wrapper<'pin, ::pin_project::__private::PhantomPinned>:
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::pin_project::__private::Unpin
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{
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}
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// Ensure that struct does not implement `Drop`.
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//
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// See ./struct-default-expanded.rs for details.
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trait StructMustNotImplDrop {}
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#[allow(clippy::drop_bounds, drop_bounds)]
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impl<T: ::pin_project::__private::Drop> StructMustNotImplDrop for T {}
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impl<T, U> StructMustNotImplDrop for Struct<T, U> {}
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// A dummy impl of `PinnedDrop`, to ensure that users don't accidentally
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// write a non-functional `PinnedDrop` impls.
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#[doc(hidden)]
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impl<T, U> ::pin_project::__private::PinnedDrop for Struct<T, U> {
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unsafe fn drop(self: ::pin_project::__private::Pin<&mut Self>) {}
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}
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};
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fn main() {
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fn _is_unpin<T: Unpin>() {}
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// _is_unpin::<Struct<(), ()>>(); //~ ERROR `std::marker::PhantomPinned` cannot be unpinned
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}
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