∀ {J : Type u_2} [inst : CategoryTheory.Category.{u_4, u_2} J] {C : Type u_1}
  [inst_1 : CategoryTheory.Category.{u_3, u_1} C] {F : CategoryTheory.Functor J C} {t : CategoryTheory.Limits.Cone F},
  Subsingleton (CategoryTheory.Limits.IsColimit t.op)