∀ (C : Type u_2) [𝒞 : CategoryTheory.EnrichedCategory (Type u_1) C] {X Y : C} (f : X ⟶[Type u_1] Y),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.leftUnitor (X ⟶[Type u_1] Y)).inv
      (CategoryTheory.CategoryStruct.comp
        (CategoryTheory.MonoidalCategoryStruct.whiskerRight (CategoryTheory.eId (Type u_1) X) (X ⟶[Type u_1] Y))
        (CategoryTheory.eComp (Type u_1) X X Y))
      f =
    CategoryTheory.CategoryStruct.id (X ⟶[Type u_1] Y) f