∀ {A : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} A] {B : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} B]
  {C : Type u₃} [inst_2 : CategoryTheory.Category.{v₃, u₃} C]
  (F : CategoryTheory.Functor A (CategoryTheory.Functor B C)) (a : A),
  F.flip.comp ((CategoryTheory.evaluation A C).obj a) = F.obj a