chore: checkpoint before Python removal

vendor/pin-project/tests/expand/project_replace/enum.rs

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+use pin_project::pin_project;
+
+#[pin_project(project_replace = EnumProjOwn)]
+enum Enum<T, U> {
+    Struct {
+        #[pin]
+        pinned: T,
+        unpinned: U,
+    },
+    Tuple(#[pin] T, U),
+    Unit,
+}
+
+fn main() {}