{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"ty::CoroutineWitness(def_id,"}]}
        ty::CoroutineWitness(def_id, args) => Ok(ecx
        // impl Copy/Clone for CoroutineWitness where T: Copy/Clone forall T in coroutine_hidden_types
            .cx()