∀ {A : Type u₁} {B : Type u₂} {C : Type u₃} [inst : CategoryTheory.Category.{v₁, u₁} A]
  [inst_1 : CategoryTheory.Category.{v₂, u₂} B] [inst_2 : CategoryTheory.Category.{v₃, u₃} C]
  {F : CategoryTheory.Functor A B} {G : CategoryTheory.Functor C B}
  {x y : CategoryTheory.Limits.CategoricalPullback F G} (eₗ : x.fst ≅ y.fst) (eᵣ : x.snd ≅ y.snd)
  (w :
    autoParam
      (CategoryTheory.CategoryStruct.comp (F.map eₗ.hom) y.iso.hom =
        CategoryTheory.CategoryStruct.comp x.iso.hom (G.map eᵣ.hom))
      CategoryTheory.Limits.CategoricalPullback.mkIso._auto_1),
  (CategoryTheory.Limits.CategoricalPullback.mkIso eₗ eᵣ w).hom.fst = eₗ.hom