∀ {C : Type u_1} [inst : CategoryTheory.EnrichedCategory CategoryTheory.Cat C] {a b c d : CategoryTheory.CatEnriched C}
  {f f' : a ⟶ b} {g g' : b ⟶ c} {h h' : c ⟶ d} (η : f ⟶ f') (θ : g ⟶ g') (κ : h ⟶ h'),
  CategoryTheory.CatEnriched.hComp (CategoryTheory.CatEnriched.hComp η θ) κ =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.eqToHom ⋯)
      (CategoryTheory.CategoryStruct.comp (CategoryTheory.CatEnriched.hComp η (CategoryTheory.CatEnriched.hComp θ κ))
        (CategoryTheory.eqToHom ⋯))