∀ {α : Type u_1} [inst : TopologicalSpace α] [inst_1 : MeasurableSpace α] (μ : MeasureTheory.Measure α) (s : Set α)
  (x : α) (motive : x ∈ {x | ∃ n ∈ nhdsWithin x s, μ n = 0} → Prop) (h : x ∈ {x | ∃ n ∈ nhdsWithin x s, μ n = 0}),
  (∀ (n : Set α) (ns : n ∈ nhdsWithin x s) (hx : μ n = 0), motive ⋯) → motive h