{motive_2 : Lean.Meta.Grind.Arith.Linear.RingEqCnstrProof → Sort u} →
  (t : Lean.Meta.Grind.Arith.Linear.RingEqCnstrProof) →
    t.ctorIdx = 1 →
      ((c : Lean.Meta.Grind.Arith.Linear.RingEqCnstr) →
          motive_2 (Lean.Meta.Grind.Arith.Linear.RingEqCnstrProof.symm c)) →
        motive_2 t