∀ {α : Type u_1} [inst : MeasurableSpace α] {ι : Type u_5} [inst_1 : Preorder ι] [Filter.atTop.IsCountablyGenerated]
  {s : ι → Set α}, Antitone s → (∃ᶠ (i : ι) in Filter.atTop, MeasurableSet (s i)) → MeasurableSet (⋂ i, s i)