∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Limits.HasZeroObject C]
  [inst_2 : CategoryTheory.Limits.HasZeroMorphisms C] (X Y : C) [inst_3 : CategoryTheory.Limits.HasBinaryCoproduct X Y],
  CategoryTheory.CategoryStruct.comp CategoryTheory.Limits.coprod.inr
      (CategoryTheory.Limits.pushoutZeroZeroIso X Y).inv =
    CategoryTheory.Limits.pushout.inr 0 0