Lean4
instance nonUnitalRing [NonUnitalRing R] : NonUnitalRing (ULift R) :=
{ zero := (0 : ULift R), add := (· + ·), mul := (· * ·), sub := Sub.sub, neg := Neg.neg, nsmul := AddMonoid.nsmul,
zsmul := SubNegMonoid.zsmul, add_assoc, zero_add, add_zero, add_comm, neg_add_cancel, left_distrib, right_distrib,
zero_mul, mul_zero, mul_assoc, sub_eq_add_neg
nsmul_zero := fun _ => AddMonoid.nsmul_zero _, nsmul_succ := fun _ _ => AddMonoid.nsmul_succ _ _,
zsmul_zero' := SubNegMonoid.zsmul_zero', zsmul_succ' := SubNegMonoid.zsmul_succ',
zsmul_neg' := SubNegMonoid.zsmul_neg' }