| // Original code (./enum-default.rs): |
| // |
| // ```rust |
| // #![allow(dead_code)] |
| // |
| // use pin_project::pin_project; |
| // |
| // #[pin_project(project = EnumProj)] |
| // enum Enum<T, U> { |
| // Pinned(#[pin] T), |
| // Unpinned(U), |
| // } |
| // |
| // fn main() {} |
| // ``` |
| |
| #![allow(dead_code, unused_imports, unused_parens, unknown_lints, renamed_and_removed_lints)] |
| #![allow( |
| clippy::needless_lifetimes, |
| clippy::just_underscores_and_digits, |
| clippy::used_underscore_binding |
| )] |
| |
| use pin_project::pin_project; |
| |
| // #[pin_project(project = EnumProj)] |
| enum Enum<T, U> { |
| Pinned(/* #[pin] */ T), |
| Unpinned(U), |
| } |
| |
| enum EnumProj<'pin, T, U> |
| where |
| Enum<T, U>: 'pin, |
| { |
| Pinned(::pin_project::__private::Pin<&'pin mut (T)>), |
| Unpinned(&'pin mut (U)), |
| } |
| |
| const _: () = { |
| // When `#[pin_project]` is used on enums, only named projection types and |
| // methods are generated because there is no way to access variants of |
| // projected types without naming it. |
| // (When `#[pin_project]` is used on structs, both methods are always generated.) |
| |
| impl<T, U> Enum<T, U> { |
| fn project<'pin>( |
| self: ::pin_project::__private::Pin<&'pin mut Self>, |
| ) -> EnumProj<'pin, T, U> { |
| unsafe { |
| match self.get_unchecked_mut() { |
| Self::Pinned(_0) => { |
| EnumProj::Pinned(::pin_project::__private::Pin::new_unchecked(_0)) |
| } |
| Self::Unpinned(_0) => EnumProj::Unpinned(_0), |
| } |
| } |
| } |
| } |
| |
| // Automatically create the appropriate conditional `Unpin` implementation. |
| // |
| // See ./struct-default-expanded.rs and https://github.com/taiki-e/pin-project/pull/53. |
| // for details. |
| struct __Enum<'pin, T, U> { |
| __pin_project_use_generics: ::pin_project::__private::AlwaysUnpin< |
| 'pin, |
| (::pin_project::__private::PhantomData<T>, ::pin_project::__private::PhantomData<U>), |
| >, |
| __field0: T, |
| } |
| impl<'pin, T, U> ::pin_project::__private::Unpin for Enum<T, U> where |
| __Enum<'pin, T, U>: ::pin_project::__private::Unpin |
| { |
| } |
| // A dummy impl of `UnsafeUnpin`, to ensure that the user cannot implement it. |
| #[doc(hidden)] |
| unsafe impl<'pin, T, U> ::pin_project::UnsafeUnpin for Enum<T, U> where |
| __Enum<'pin, T, U>: ::pin_project::__private::Unpin |
| { |
| } |
| |
| // Ensure that enum does not implement `Drop`. |
| // |
| // See ./struct-default-expanded.rs for details. |
| trait EnumMustNotImplDrop {} |
| #[allow(clippy::drop_bounds, drop_bounds)] |
| impl<T: ::pin_project::__private::Drop> EnumMustNotImplDrop for T {} |
| impl<T, U> EnumMustNotImplDrop for Enum<T, U> {} |
| // A dummy impl of `PinnedDrop`, to ensure that users don't accidentally |
| // write a non-functional `PinnedDrop` impls. |
| #[doc(hidden)] |
| impl<T, U> ::pin_project::__private::PinnedDrop for Enum<T, U> { |
| unsafe fn drop(self: ::pin_project::__private::Pin<&mut Self>) {} |
| } |
| |
| // We don't need to check for `#[repr(packed)]`, |
| // since it does not apply to enums. |
| }; |
| |
| fn main() {} |