∀ {α : Type u_1} {m : MeasurableSpace α} {μ : MeasureTheory.Measure α} (_s : Set α)
  (motive : (∃ t, _sᶜ ⊆ t ∧ MeasurableSet t ∧ μ t = 0) → Prop) (x : ∃ t, _sᶜ ⊆ t ∧ MeasurableSet t ∧ μ t = 0),
  (∀ (t : Set α) (hst : _sᶜ ⊆ t) (htm : MeasurableSet t) (htμ : μ t = 0), motive ⋯) → motive x