∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.MonoidalCategory C] (x y : C)
  [inst_2 : CategoryTheory.Closed x],
  CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.leftUnitor (x ⟹ y)).inv
      (CategoryTheory.CategoryStruct.comp
        (CategoryTheory.MonoidalCategoryStruct.whiskerRight (CategoryTheory.MonoidalClosed.id x) (x ⟹ y))
        (CategoryTheory.MonoidalClosed.comp x x y)) =
    CategoryTheory.CategoryStruct.id (x ⟹ y)