{C : Type u} →
  [inst : CategoryTheory.Category.{v, u} C] →
    {F₁ F₂ : CategoryTheory.Functor C (Type w)} →
      {A : CategoryTheory.Subfunctor F₁} →
        (f g : A.toFunctor ⟶ F₂) → (CategoryTheory.Subfunctor.equalizer f g).toFunctor ⟶ A.toFunctor