chore: checkpoint before Python removal

vendor/darling/tests/compile-fail/not_impl_from_meta.rs

@@ -0,0 +1,16 @@
+use darling::FromMeta;
+
+struct NotImplFm;
+
+#[derive(FromMeta)]
+struct OuterFm {
+    inner: NotImplFm,
+}
+
+#[derive(darling::FromDeriveInput)]
+#[darling(attributes(hello))]
+struct OuterFdi {
+    inner: NotImplFm,
+}
+
+fn main() {}