{"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"DefiningTy::Closure(_,"}]}
            DefiningTy::Closure(_, args) => args.as_closure().upvar_tys(),
        match self {
            DefiningTy::CoroutineClosure(_, args) => args.as_coroutine_closure().upvar_tys(),