∀ {α : Type u_2} [inst : TopologicalSpace α] {x : α} [inst_1 : SizeOf α] (toOpens : TopologicalSpace.Opens α)
  (mem' : x ∈ toOpens.carrier), sizeOf { toOpens := toOpens, mem' := mem' } = 1 + sizeOf toOpens + sizeOf mem'