--- a/src/tree.c Sun Dec 28 15:45:39 2025 +0100 +++ b/src/tree.c Sun Dec 28 17:31:20 2025 +0100 @@ -417,7 +417,7 @@ return iter->node; } -cx_attr_nonnull +CX_NONNULL static void cx_tree_visitor_enqueue_siblings( struct cx_tree_visitor_s *iter, void *node, ptrdiff_t loc_next) { node = tree_next(node);