Isabelle / HOL：对于类型的任意值，是否有简明的表示法？

Question

在Isabelle / HOL中，我可以用Console.Write("Row (1-3): "); int UserRowChoice = Convert.ToInt32(Console.ReadLine()); try { } catch (InvalidCastException e) { ThrowError("You typed a string instead of an integer. You've lost your turn."); Console.ReadKey(); RunGame(T1, CurrentPlayer, Winner); } if (UserRowChoice < 1 || UserRowChoice > 3) { ThrowError("You either typed a number that was less than 1 or greater than 3. You've lost your turn."); Console.ReadKey(); RunGame(T1, CurrentPlayer, Winner); } 表示任意类型的任意（但固定）值。对此有更简洁的表示法吗？

Answer 1

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（我希望我能写上面的内容，但答案必须超过9个字符。）