∀ {α : Type u_1} {l : Filter α} {G : Type u_6} [inst : SubtractionMonoid G],
  Filter.Germ.instSubtractionMonoid =
    { toSubNegMonoid := Filter.Germ.subNegMonoid, neg_neg := ⋯, neg_add_rev := ⋯, neg_eq_of_add := ⋯ }