{C : Type u_1} →
  [inst : CategoryTheory.Category.{v_1, u_1} C] →
    {W : CategoryTheory.MorphismProperty C} →
      {X Y : C} →
        {motive : W.LeftFraction₃ X Y → Sort u} →
          (t : W.LeftFraction₃ X Y) →
            ({Y' : C} →
                (f f' f'' : X ⟶ Y') →
                  (s : Y ⟶ Y') → (hs : W s) → motive { Y' := Y', f := f, f' := f', f'' := f'', s := s, hs := hs }) →
              motive t