catch (Throwable t) { rethrow(t);
catch (RuntimeException e) { rethrow(e, RuntimeException.class); } catch (IOException e) { throw new QuercusException(e);
  public Value execute(Env env)    throws Throwable  {    try {      Value value = _expr.eval(env);      value.print(env);    }    catch (Throwable t) {      rethrow(t);    }    return null;  }