throws Throwable
throws IOException
  public static Value print_r(Env env,			      @ReadOnly Value v,			      @Optional Value isRet)    throws Throwable  {    // XXX: isRet is ignored    WriteStream out = env.getOut();    v.printR(env, out, 0, new IdentityHashMap<Value, String>());    return BooleanValue.FALSE;  }