∀ {C : Type u_1} {D : Type u_2} [inst : CategoryTheory.Category.{u_4, u_1} C]
  [inst_1 : CategoryTheory.Category.{u_3, u_2} D] (F : CategoryTheory.Functor C D)
  (motive :
    Nonempty
        (CategoryTheory.Functor.LeftExtension.mk (CategoryTheory.Functor.id D)
            F.rightUnitor.inv).IsPointwiseLeftKanExtension →
      Prop)
  (x :
    Nonempty
      (CategoryTheory.Functor.LeftExtension.mk (CategoryTheory.Functor.id D)
          F.rightUnitor.inv).IsPointwiseLeftKanExtension),
  (∀
      (h :
        (CategoryTheory.Functor.LeftExtension.mk (CategoryTheory.Functor.id D)
            F.rightUnitor.inv).IsPointwiseLeftKanExtension),
      motive ⋯) →
    motive x