∀ {C : Type u_3} [inst : CategoryTheory.Category.{u_2, u_3} C] (X : C) (Y : CategoryTheory.Limits.FormalCoproduct C)
  (x : (i : Y.I) × (X ⟶ Y.obj i)),
  CategoryTheory.Limits.FormalCoproduct.Hom.asSigma (CategoryTheory.Limits.FormalCoproduct.Hom.fromIncl x.fst x.snd) =
    CategoryTheory.Limits.FormalCoproduct.Hom.asSigma (CategoryTheory.Limits.FormalCoproduct.Hom.fromIncl x.fst x.snd)