∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] (X : Cᵒᵖ)
  (s : CategoryTheory.Limits.Cocone (CategoryTheory.coyoneda.obj X))
  (m : (CategoryTheory.Coyoneda.colimitCocone X).pt ⟶ s.pt),
  (∀ (j : C), CategoryTheory.CategoryStruct.comp ((CategoryTheory.Coyoneda.colimitCocone X).ι.app j) m = s.ι.app j) →
    m = fun x => s.ι.app (Opposite.unop X) (CategoryTheory.CategoryStruct.id (Opposite.unop X))