∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] {X Y Z : C} (f : X ⟶ Y) (g : X ⟶ Z)
  [inst_1 : CategoryTheory.Limits.HasPushout f g] [inst_2 : CategoryTheory.Limits.HasBinaryCoproduct Y Z],
  CategoryTheory.Epi
    (CategoryTheory.Limits.coprod.desc (CategoryTheory.Limits.pushout.inl f g) (CategoryTheory.Limits.pushout.inr f g))