{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"DefiningTy::CoroutineClosure(def_id,"}]}
            DefiningTy::CoroutineClosure(def_id, args) => {
            // Then we wrap it all up into a list of inputs and output.
                assert_eq!(self.mir_def.to_def_id(), def_id);