∀ {J : Type u_3} {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C]
  [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C] (f : J → C) [inst_2 : CategoryTheory.Limits.HasBiproduct f]
  {b : CategoryTheory.Limits.Bicone f} (hb : b.IsBilimit),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.biproduct.lift b.π)
      (CategoryTheory.Limits.biproduct.desc b.ι) =
    CategoryTheory.CategoryStruct.id b.pt