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@lexer::members {
  @Override
  public void reportError(RecognitionException e) {
    Thrower.sneakyThrow(e);
  }

  /**
   * See "Puzzle 43: Exceptionally Unsafe" from Bloch Gafter, <i>Java Puzzlers</i>. Addison Wesley 2005.
   */
  static class Thrower {
    private static Throwable t;
    private Thrower() throws Throwable {
      throw t;
    }
    public static synchronized void sneakyThrow(Throwable t) {
      Thrower.t = t;
      try {
        Thrower.class.newInstance();
      } catch (InstantiationException e) {
        throw new IllegalArgumentException(e);
      } catch (IllegalAccessException e) {
        throw new IllegalArgumentException(e);
      } finally {
        Thrower.t = null; // Avoid memory leak
      }
    }
  }
}