{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"DefiningTy::CoroutineClosure(_,"}]}
            DefiningTy::CoroutineClosure(_, args) => args.as_coroutine_closure().upvar_tys(),
            DefiningTy::Closure(_, args) => args.as_closure().upvar_tys(),
            DefiningTy::Coroutine(_, args) => args.as_coroutine().upvar_tys(),