∀ {A : Type u_10} {B : Type u_6} {C : Type u_1} {A' : Type u_11} {B' : Type u_3} {C' : Type u_12}
  [inst : CategoryTheory.Category.{u_7, u_10} A] [inst_1 : CategoryTheory.Category.{u_5, u_6} B]
  [inst_2 : CategoryTheory.Category.{u_4, u_1} C] {F : CategoryTheory.Functor A B} {G : CategoryTheory.Functor C B}
  [inst_3 : CategoryTheory.Category.{u_8, u_11} A'] [inst_4 : CategoryTheory.Category.{u_2, u_3} B']
  [inst_5 : CategoryTheory.Category.{u_9, u_12} C'] {F' : CategoryTheory.Functor A' B'}
  {G' : CategoryTheory.Functor C' B'} (ψ : CategoryTheory.Limits.CatCospanTransform F G F' G'),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.CatCommSq.iso G ψ.right ψ.base G').hom
      (CategoryTheory.Functor.whiskerRight (CategoryTheory.CategoryStruct.id ψ.right) G') =
    CategoryTheory.CategoryStruct.comp (G.whiskerLeft (CategoryTheory.CategoryStruct.id ψ.base))
      (CategoryTheory.CatCommSq.iso G ψ.right ψ.base G').hom