∀ {J : Type u_2} [inst : CategoryTheory.Category.{u_4, u_2} J] {C : Type u_3}
  [inst_1 : CategoryTheory.Category.{u_1, u_3} C] (F : CategoryTheory.Functor J C)
  (X : CategoryTheory.StructuredArrow F (CategoryTheory.Functor.const J)),
  { hom := (CategoryTheory.CategoryStruct.id X).right, w := ⋯ } =
    CategoryTheory.CategoryStruct.id { pt := X.right, ι := X.hom }