∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] {A F : CategoryTheory.Functor Cᵒᵖ (Type v)} (η : F ⟶ A)
  {X Y : (CategoryTheory.CostructuredArrow CategoryTheory.yoneda A)ᵒᵖ} (f : X ⟶ Y)
  (u : CategoryTheory.OverPresheafAux.OverArrows η (Opposite.unop X).hom),
  (CategoryTheory.OverPresheafAux.restrictedYonedaObj η).map f u = u.map₂ f.unop.left ⋯