{"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"assert!(old_index.is_none(),"}]}
            assert!(old_index.is_none(), "placeholder field index is reset for a node ID");
            let old_index = self.resolver.placeholder_field_indices.insert(field.id, index(self));
            self.visit_macro_invoc(field.id);