1 files changed, 125 insertions, 0 deletions
diff --git a/third_party/rust/pin-project/examples/not_unpin-expanded.rs b/third_party/rust/pin-project/examples/not_unpin-expanded.rs
new file mode 100644
index 0000000000..5700c120a5
--- /dev/null
+++ b/third_party/rust/pin-project/examples/not_unpin-expanded.rs
@@ -0,0 +1,125 @@
+// Original code (./not_unpin.rs):
+//
+// ```rust
+// #![allow(dead_code)]
+//
+// use pin_project::pin_project;
+//
+// #[pin_project(!Unpin)]
+// pub struct Struct<T, U> {
+//     #[pin]
+//     pinned: T,
+//     unpinned: U,
+// }
+//
+// fn main() {
+//     fn _is_unpin<T: Unpin>() {}
+//     // _is_unpin::<Struct<(), ()>>(); //~ ERROR `std::marker::PhantomPinned` cannot be unpinned
+// }
+// ```
+
+#![allow(dead_code, unused_imports, unused_parens, unknown_lints, renamed_and_removed_lints)]
+#![allow(clippy::needless_lifetimes)]
+
+use pin_project::pin_project;
+
+// #[pin_project(!Unpin)]
+pub struct Struct<T, U> {
+    // #[pin]
+    pinned: T,
+    unpinned: U,
+}
+
+const _: () = {
+    pub(crate) struct __StructProjection<'pin, T, U>
+    where
+        Struct<T, U>: 'pin,
+    {
+        pinned: ::pin_project::__private::Pin<&'pin mut (T)>,
+        unpinned: &'pin mut (U),
+    }
+    pub(crate) struct __StructProjectionRef<'pin, T, U>
+    where
+        Struct<T, U>: 'pin,
+    {
+        pinned: ::pin_project::__private::Pin<&'pin (T)>,
+        unpinned: &'pin (U),
+    }
+
+    impl<T, U> Struct<T, U> {
+        pub(crate) fn project<'pin>(
+            self: ::pin_project::__private::Pin<&'pin mut Self>,
+        ) -> __StructProjection<'pin, T, U> {
+            unsafe {
+                let Self { pinned, unpinned } = self.get_unchecked_mut();
+                __StructProjection {
+                    pinned: ::pin_project::__private::Pin::new_unchecked(pinned),
+                    unpinned,
+                }
+            }
+        }
+        pub(crate) fn project_ref<'pin>(
+            self: ::pin_project::__private::Pin<&'pin Self>,
+        ) -> __StructProjectionRef<'pin, T, U> {
+            unsafe {
+                let Self { pinned, unpinned } = self.get_ref();
+                __StructProjectionRef {
+                    pinned: ::pin_project::__private::Pin::new_unchecked(pinned),
+                    unpinned,
+                }
+            }
+        }
+    }
+
+    // Ensure that it's impossible to use pin projections on a #[repr(packed)]
+    // struct.
+    //
+    // See ./struct-default-expanded.rs and https://github.com/taiki-e/pin-project/pull/34
+    // for details.
+    #[forbid(unaligned_references, safe_packed_borrows)]
+    fn __assert_not_repr_packed<T, U>(this: &Struct<T, U>) {
+        let _ = &this.pinned;
+        let _ = &this.unpinned;
+    }
+
+    // Create `Unpin` impl that has trivial `Unpin` bounds.
+    //
+    // See https://github.com/taiki-e/pin-project/issues/102#issuecomment-540472282
+    // for details.
+    impl<'pin, T, U> ::pin_project::__private::Unpin for Struct<T, U> where
+        ::pin_project::__private::Wrapper<'pin, ::pin_project::__private::PhantomPinned>:
+            ::pin_project::__private::Unpin
+    {
+    }
+    // A dummy impl of `UnsafeUnpin`, to ensure that the user cannot implement it.
+    //
+    // To ensure that users don't accidentally write a non-functional `UnsafeUnpin`
+    // impls, we emit one ourselves. If the user ends up writing an `UnsafeUnpin`
+    // impl, they'll get a "conflicting implementations of trait" error when
+    // coherence checks are run.
+    #[doc(hidden)]
+    unsafe impl<'pin, T, U> ::pin_project::UnsafeUnpin for Struct<T, U> where
+        ::pin_project::__private::Wrapper<'pin, ::pin_project::__private::PhantomPinned>:
+            ::pin_project::__private::Unpin
+    {
+    }
+
+    // Ensure that struct does not implement `Drop`.
+    //
+    // See ./struct-default-expanded.rs for details.
+    trait StructMustNotImplDrop {}
+    #[allow(clippy::drop_bounds, drop_bounds)]
+    impl<T: ::pin_project::__private::Drop> StructMustNotImplDrop for T {}
+    impl<T, U> StructMustNotImplDrop for Struct<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 Struct<T, U> {
+        unsafe fn drop(self: ::pin_project::__private::Pin<&mut Self>) {}
+    }
+};
+
+fn main() {
+    fn _is_unpin<T: Unpin>() {}
+    // _is_unpin::<Struct<(), ()>>(); //~ ERROR `std::marker::PhantomPinned` cannot be unpinned
+}