∀ {C : Type u₁} {inst : CategoryTheory.Category.{v₁, u₁} C} {inst_1 : CategoryTheory.MonoidalCategory C} {M N : C}
  {inst_2 : CategoryTheory.ComonObj M} {inst_3 : CategoryTheory.ComonObj N} (f : M ⟶ N)
  [self : CategoryTheory.IsComonHom f],
  CategoryTheory.CategoryStruct.comp f CategoryTheory.ComonObj.comul =
    CategoryTheory.CategoryStruct.comp CategoryTheory.ComonObj.comul
      (CategoryTheory.MonoidalCategoryStruct.tensorHom f f)