∀ {V : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} V] [inst_1 : CategoryTheory.MonoidalCategory V]
  {a b c : CategoryTheory.EnrichedCat V} (f : CategoryTheory.EnrichedFunctor V ↑a ↑b)
  {g h i : CategoryTheory.EnrichedFunctor V ↑b ↑c} (η : g ⟶ h) (θ : h ⟶ i),
  CategoryTheory.EnrichedCat.whiskerLeft f (CategoryTheory.CategoryStruct.comp η θ) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.EnrichedCat.whiskerLeft f η)
      (CategoryTheory.EnrichedCat.whiskerLeft f θ)