{v : Lean.Level} →
  {M : Q(Type v)} →
    {motive : Mathlib.Tactic.FieldSimp.Sign M → Sort u} →
      (t : Mathlib.Tactic.FieldSimp.Sign M) →
        t.ctorIdx = 1 → ((iM : Q(Field «$M»)) → motive (Mathlib.Tactic.FieldSimp.Sign.minus iM)) → motive t