{P : Sort u} →
  {x : Int.Linear.Var} →
    {c₁ c₂ : Lean.Meta.Grind.Arith.Cutsat.EqCnstr} →
      {x' : Int.Linear.Var} →
        {c₁' c₂' : Lean.Meta.Grind.Arith.Cutsat.EqCnstr} →
          Lean.Meta.Grind.Arith.Cutsat.EqCnstrProof.subst x c₁ c₂ =
              Lean.Meta.Grind.Arith.Cutsat.EqCnstrProof.subst x' c₁' c₂' →
            (x = x' → c₁ = c₁' → c₂ = c₂' → P) → P