{motive : BigOperators.FinsetResult✝ → Sort u} →
  (ctorIdx : ℕ) →
    (t : BigOperators.FinsetResult✝¹) →
      ctorIdx = BigOperators.FinsetResult.ctorIdx✝ t → BigOperators.FinsetResult.ctorElimType✝ ctorIdx → motive t