{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"ty::Coroutine(def_id,"}]}
        ty::Coroutine(def_id, args) => (def_id, args.as_coroutine().prefix_tys()),
    let (&def_id, up_var_tys) = match closure_or_coroutine_ty.kind() {
        ty::Closure(def_id, args) => (def_id, args.as_closure().upvar_tys()),