∀ {C : Type u_1} [inst : CategoryTheory.Category.{u_2, u_1} C] {A : CategoryTheory.Functor Cᵒᵖ (Type u_2)} {X Y : C}
  {f : X ⟶ Y} {g g' : CategoryTheory.yoneda.obj Y ⟶ A},
  g = g' →
    Opposite.op
        (CategoryTheory.CostructuredArrow.mk (CategoryTheory.CategoryStruct.comp (CategoryTheory.yoneda.map f) g')) =
      Opposite.op
        (CategoryTheory.CostructuredArrow.mk (CategoryTheory.CategoryStruct.comp (CategoryTheory.yoneda.map f) g))