∀ (C : Type u) [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.LocallySmall.{w, v, u} C]
  {X Y Z : CategoryTheory.ShrinkHoms.{u} C} (f : Shrink.{w, v} (X.fromShrinkHoms ⟶ Y.fromShrinkHoms))
  (g : Shrink.{w, v} (Y.fromShrinkHoms ⟶ Z.fromShrinkHoms)),
  CategoryTheory.CategoryStruct.comp f g =
    (equivShrink (X.fromShrinkHoms ⟶ Z.fromShrinkHoms))
      (CategoryTheory.CategoryStruct.comp ((equivShrink (X.fromShrinkHoms ⟶ Y.fromShrinkHoms)).symm f)
        ((equivShrink (Y.fromShrinkHoms ⟶ Z.fromShrinkHoms)).symm g))