∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {X Y Z : Cᴹᵒᵖ} {f : X ⟶ Y} {g : Y ⟶ Z},
  CategoryTheory.CategoryStruct.comp f.unmop g.unmop = (CategoryTheory.CategoryStruct.comp f g).unmop