∀ {G : Type u_1} [inst : Group G] [inst_1 : TopologicalSpace G] [inst_2 : MeasurableSpace G] [inst_3 : BorelSpace G]
  [inst_4 : IsTopologicalGroup G] [inst_5 : LocallyCompactSpace G] (φ : G ≃ₜ* G), 0 < MeasureTheory.mulEquivHaarChar φ