∀ (G : Type u) {α : Type w} {m : MeasurableSpace α} [inst : AddGroup G] [inst_1 : AddAction G α]
  {μ : MeasureTheory.Measure α} [MeasureTheory.VAddInvariantMeasure G α μ] [inst_3 : TopologicalSpace α]
  [ContinuousConstVAdd G α] [AddAction.IsMinimal G α] {U : Set α} [μ.Regular], μ ≠ 0 → IsOpen U → (μ U = 0 ↔ U = ∅)