∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] {J : CategoryTheory.Limits.MultispanShape}
  (I : CategoryTheory.Limits.MultispanIndex J C) [inst_1 : CategoryTheory.Limits.HasCoproduct I.left]
  [inst_2 : CategoryTheory.Limits.HasCoproduct I.right] (X : CategoryTheory.Limits.Multicofork I),
  (I.multicoforkEquivSigmaCofork.unitIso.hom.app X).hom = CategoryTheory.CategoryStruct.id X.pt