∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  {D : Type u_4} [inst_2 : CategoryTheory.Category.{u_3, u_4} D] [inst_3 : CategoryTheory.MonoidalCategory D]
  (F : CategoryTheory.Functor C D) [inst_4 : CategoryTheory.BraidedCategory C]
  [inst_5 : CategoryTheory.BraidedCategory D] [inst_6 : F.LaxBraided] {X Y : CategoryTheory.Mon C}
  (X' : CategoryTheory.Mon C) (f : X ⟶ Y),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategoryStruct.whiskerLeft (F.mapMon.obj X') (F.mapMon.map f))
      { hom := CategoryTheory.Functor.LaxMonoidal.μ F X'.X Y.X, isMonHom_hom := ⋯ } =
    CategoryTheory.CategoryStruct.comp { hom := CategoryTheory.Functor.LaxMonoidal.μ F X'.X X.X, isMonHom_hom := ⋯ }
      (F.mapMon.map (CategoryTheory.MonoidalCategoryStruct.whiskerLeft X' f))