∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Limits.HasBinaryCoproducts C]
  [inst_2 : CategoryTheory.Limits.HasInitial C] (P : C),
  (CategoryTheory.Limits.coprod.rightUnitor P).hom =
    CategoryTheory.Limits.coprod.desc (CategoryTheory.CategoryStruct.id P) (CategoryTheory.Limits.initial.to P)