chore: checkpoint before Python removal

vendor/pin-project/tests/ui/pin_project/packed_sneaky-2.rs

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+use auxiliary_macro::hidden_repr_macro;
+use pin_project::pin_project;
+
+hidden_repr_macro! { //~ ERROR may not be used on #[repr(packed)] types
+    #[pin_project]
+    struct B {
+        #[pin]
+        f: u32,
+    }
+}
+
+fn main() {}