{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
    let (&def_id, up_var_tys) = match closure_or_coroutine_ty.kind() {
) -> SmallVec<&'ll DIType> {
        ty::Coroutine(def_id, args) => (def_id, args.as_coroutine().prefix_tys()),