{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"ty::CoroutineClosure(_,"}]}
                ty::CoroutineClosure(_, args) => {
                ty::Closure(_, args) => args.as_closure().sig().bound_vars(),
                    args.as_coroutine_closure().coroutine_closure_sig().bound_vars()