∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  {A B : CategoryTheory.Mon C} (self : Bimod A B) {Z : C} (h : self.X ⟶ Z),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategoryStruct.whiskerLeft self.X CategoryTheory.MonObj.one)
      (CategoryTheory.CategoryStruct.comp self.actRight h) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.rightUnitor self.X).hom h