∀ {C : Type u_1} {D : Type u_2} [inst : CategoryTheory.Category.{u_3, u_1} C]
  [inst_1 : CategoryTheory.Category.{u_4, u_2} D] {P : CategoryTheory.MorphismProperty D}
  (Q : CategoryTheory.MorphismProperty C) {F : CategoryTheory.Functor C D} {X : D} {A : C} (f : F.obj A ⟶ X) (hf : P f),
  (CategoryTheory.MorphismProperty.CostructuredArrow.mk Q f hf).hom = f