∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] (X : C) {X_1 Y : Cᵒᵖ} (f : X_1 ⟶ Y)
  (g : Opposite.unop X_1 ⟶ X), (CategoryTheory.yoneda.obj X).map f g = CategoryTheory.CategoryStruct.comp f.unop g