∀ {C : Type uC} [inst : CategoryTheory.Category.{uC', uC} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  {W X Y : C} [inst_2 : CategoryTheory.Limits.HasBinaryBiproduct X Y] (f : W ⟶ X) (g : W ⟶ Y),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.biprod.lift f g) CategoryTheory.Limits.biprod.fst = f