{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
            let new_field_name = field_names.get(&field_name)?;
            let field_name: SmolStr = field_expr.name_ref()?.to_string().into();
            let new_expr = make.expr_path(ast::make::ext::ident_path(new_field_name));