∀ {G : Type u_1} {X : Type u_2} [inst : MeasurableSpace X] {μ : MeasureTheory.Measure X} [inst_1 : Group G]
  [inst_2 : MulAction G X] {ι : Type u_3} {l : Filter ι} {F : ι → Set X},
  IsFoelner G μ l F → ∀ᶠ (i : ι) in l, MeasurableSet (F i)