∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Limits.HasPullbacks C] {X : C}
  {R S T : CategoryTheory.Over X} (f : S ⟶ T) {Z : C} (h : T.left ⟶ Z),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.whiskerRight f R).left
      (CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.pullback.fst T.hom R.hom) h) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.pullback.fst S.hom R.hom)
      (CategoryTheory.CategoryStruct.comp f.left h)