∀ {B : Type u₁} [inst : CategoryTheory.Bicategory B] {C : Type u₂} [inst_1 : CategoryTheory.Bicategory C]
  {X Y Z : CategoryTheory.OplaxFunctor B C} (η : CategoryTheory.Oplax.OplaxTrans X Y)
  (θ : CategoryTheory.Oplax.OplaxTrans Y Z) (a : B),
  (CategoryTheory.CategoryStruct.comp η θ).app a = CategoryTheory.CategoryStruct.comp (η.app a) (θ.app a)