{J : Type w} →
  {motive : (a a_1 : CategoryTheory.Limits.WidePullbackShape J) → a.Hom a_1 → Sort u} →
    {a a_1 : CategoryTheory.Limits.WidePullbackShape J} →
      (t : a.Hom a_1) →
        t.ctorIdx = 0 →
          ((X : CategoryTheory.Limits.WidePullbackShape J) →
              motive X X (CategoryTheory.Limits.WidePullbackShape.Hom.id X)) →
            motive a a_1 t