∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Limits.HasInitial C]
  [inst_2 : CategoryTheory.Limits.HasPushouts C] (X Y : C) [inst_3 : CategoryTheory.Limits.HasBinaryCoproduct X Y]
  {Z : C} (h : X ⨿ Y ⟶ Z),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.Limits.pushout.inl (CategoryTheory.Limits.initial.to X) (CategoryTheory.Limits.initial.to Y))
      (CategoryTheory.CategoryStruct.comp (coprodIsoPushout X Y).inv h) =
    CategoryTheory.CategoryStruct.comp CategoryTheory.Limits.coprod.inl h