{P : Sort u} →
  {i : ℕ} →
    {type : Lean.IR.IRType} →
      {i' : ℕ} →
        {type' : Lean.IR.IRType} →
          Lean.IR.CtorFieldInfo.object i type = Lean.IR.CtorFieldInfo.object i' type' → (i = i' → type = type' → P) → P