{"ast_node_type":"impl","tokens":[{"end":103,"kind":"keyword","start":0,"text":"//"}]}
        // impl Copy/Clone for (T1, T2, .., Tn) where T1: Copy/Clone, T2: Copy/Clone, .. Tn: Copy/Clone
        ty::Tuple(tys) => Ok(ty::Binder::dummy(tys.to_vec())),