{n : Q(ℕ)} →
  {motive : Mathlib.Meta.Nat.UnifyZeroOrSuccResult n → Sort u} →
    (t : Mathlib.Meta.Nat.UnifyZeroOrSuccResult n) →
      t.ctorIdx = 1 →
        ((n' : Q(ℕ)) → (pf : «$n» =Q «$n'».succ) → motive (Mathlib.Meta.Nat.UnifyZeroOrSuccResult.succ n' pf)) →
          motive t