∀ {C : Type u_1} {H : Type u_3} {D : Type u_4} [inst : CategoryTheory.Category.{v_1, u_1} C]
  [inst_1 : CategoryTheory.Category.{v_3, u_3} H] [inst_2 : CategoryTheory.Category.{v_4, u_4} D]
  {L : CategoryTheory.Functor C D} {F : CategoryTheory.Functor C H} [inst_3 : L.HasRightKanExtension F]
  {G : CategoryTheory.Functor D H} {γ₁ γ₂ : G ⟶ L.rightKanExtension F},
  γ₁ = γ₂ ↔
    CategoryTheory.CategoryStruct.comp (L.whiskerLeft γ₁) (L.rightKanExtensionCounit F) =
      CategoryTheory.CategoryStruct.comp (L.whiskerLeft γ₂) (L.rightKanExtensionCounit F)