chore: checkpoint before Python removal

vendor/pin-project-lite/tests/expand/default/enum.rs

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+use pin_project_lite::pin_project;
+
+pin_project! {
+    #[project = EnumProj]
+    #[project_ref = EnumProjRef]
+    #[project_replace = EnumProjReplace]
+    enum Enum<T, U> {
+        Struct {
+            #[pin]
+            pinned: T,
+            unpinned: U,
+        },
+        Unit,
+    }
+}
+
+fn main() {}