∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] {J : Type u} [inst_1 : LinearOrder J]
  [inst_2 : SuccOrder J] {j : J} (hj : ¬IsMax j) (F : CategoryTheory.Functor (↑(Set.Iic j)) C) (X : C),
  CategoryTheory.SmallObject.SuccStruct.extendToSucc.objSuccIso hj F X = CategoryTheory.eqToIso ⋯