∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] {F G : CategoryTheory.Functor C C} {α β : F ⟶ G} (h : α = β),
  CategoryTheory.Endofunctor.Algebra.functorOfNatTransEq h = CategoryTheory.Endofunctor.Algebra.functorOfNatTransEq h