∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {J : Type w} [inst_1 : CategoryTheory.Category.{w', w} J]
  {X : C} {K : CategoryTheory.Functor J (CategoryTheory.Over X)}
  (t : CategoryTheory.Limits.Cone (CategoryTheory.WithTerminal.liftFromOver.obj K)),
  (CategoryTheory.WithTerminal.coneBack✝.obj t).pt = CategoryTheory.Over.mk (t.π.app CategoryTheory.WithTerminal.star)