1 files changed, 156 insertions, 0 deletions
diff --git a/third_party/rust/pin-project/examples/project_replace-expanded.rs b/third_party/rust/pin-project/examples/project_replace-expanded.rs
new file mode 100644
index 0000000000..445e5705e1
--- /dev/null
+++ b/third_party/rust/pin-project/examples/project_replace-expanded.rs
@@ -0,0 +1,156 @@
+// Original code (./struct-default.rs):
+//
+// ```rust
+// #![allow(dead_code)]
+//
+// use pin_project::pin_project;
+//
+// #[pin_project(project_replace)]
+// struct Struct<T, U> {
+//     #[pin]
+//     pinned: T,
+//     unpinned: U,
+// }
+//
+// fn main() {}
+// ```
+
+#![allow(dead_code, unused_imports, unused_parens, unknown_lints, renamed_and_removed_lints)]
+#![allow(clippy::needless_lifetimes)]
+
+use pin_project::pin_project;
+
+// #[pin_project(project_replace)]
+struct Struct<T, U> {
+    // #[pin]
+    pinned: T,
+    unpinned: U,
+}
+
+const _: () = {
+    struct __StructProjection<'pin, T, U>
+    where
+        Struct<T, U>: 'pin,
+    {
+        pinned: ::pin_project::__private::Pin<&'pin mut (T)>,
+        unpinned: &'pin mut (U),
+    }
+    struct __StructProjectionRef<'pin, T, U>
+    where
+        Struct<T, U>: 'pin,
+    {
+        pinned: ::pin_project::__private::Pin<&'pin (T)>,
+        unpinned: &'pin (U),
+    }
+    struct __StructProjectionOwned<T, U> {
+        pinned: ::pin_project::__private::PhantomData<T>,
+        unpinned: U,
+    }
+
+    impl<T, U> Struct<T, U> {
+        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,
+                }
+            }
+        }
+        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,
+                }
+            }
+        }
+        fn project_replace(
+            self: ::pin_project::__private::Pin<&mut Self>,
+            __replacement: Self,
+        ) -> __StructProjectionOwned<T, U> {
+            unsafe {
+                let __self_ptr: *mut Self = self.get_unchecked_mut();
+
+                // Destructors will run in reverse order, so next create a guard to overwrite
+                // `self` with the replacement value without calling destructors.
+                let __guard =
+                    ::pin_project::__private::UnsafeOverwriteGuard::new(__self_ptr, __replacement);
+
+                let Self { pinned, unpinned } = &mut *__self_ptr;
+
+                // First, extract all the unpinned fields
+                let __result = __StructProjectionOwned {
+                    pinned: ::pin_project::__private::PhantomData,
+                    unpinned: ::pin_project::__private::ptr::read(unpinned),
+                };
+
+                // Now create guards to drop all the pinned fields
+                //
+                // Due to a compiler bug (https://github.com/rust-lang/rust/issues/47949)
+                // this must be in its own scope, or else `__result` will not be dropped
+                // if any of the destructors panic.
+                {
+                    let __guard = ::pin_project::__private::UnsafeDropInPlaceGuard::new(pinned);
+                }
+
+                // Finally, return the result
+                __result
+            }
+        }
+    }
+
+    // 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;
+    }
+
+    // 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 __Struct<'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 Struct<T, U> where
+        __Struct<'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 Struct<T, U> where
+        __Struct<'pin, T, U>: ::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() {}