∀ {R : Type v} [inst : NonUnitalNonAssocSemiring R] [inst_1 : Star R] [inst_2 : SizeOf R]
  (toNonUnitalSubsemiring : NonUnitalSubsemiring R)
  (star_mem' : ∀ {a : R}, a ∈ toNonUnitalSubsemiring.carrier → star a ∈ toNonUnitalSubsemiring.carrier),
  sizeOf { toNonUnitalSubsemiring := toNonUnitalSubsemiring, star_mem' := star_mem' } =
    1 + sizeOf toNonUnitalSubsemiring