∀ {J : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} J] {C : Type u} [inst_1 : CategoryTheory.Category.{v, u} C]
  {F : CategoryTheory.Functor J C} [inst_2 : CategoryTheory.Limits.HasColimit F]
  (t : CategoryTheory.Limits.ColimitCocone F) (j : J),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.colimit.ι F j)
      (CategoryTheory.Limits.colimit.isoColimitCocone t).hom =
    t.cocone.ι.app j