{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
            let expr = descended.as_ref().unwrap_or(expr);
            let descended = sema.descend_node_into_attributes(expr.clone()).pop();
            sema.type_of_expr(&expr.expr()?)?.original.as_callable(sema.db).zip(expr.arg_list())