{motive_2 : Lean.Meta.Grind.Arith.CommRing.EqCnstrProof → Sort u} →
  (t : Lean.Meta.Grind.Arith.CommRing.EqCnstrProof) →
    t.ctorIdx = 1 →
      ((a b : Lean.Expr) →
          (sa sb : Lean.Meta.Grind.Arith.CommRing.SemiringExpr) →
            (ra rb : Lean.Meta.Grind.Arith.CommRing.RingExpr) →
              motive_2 (Lean.Meta.Grind.Arith.CommRing.EqCnstrProof.coreS a b sa sb ra rb)) →
        motive_2 t