srecord noeq TimeoutException(double timeoutSeconds,
  O function,
  Thread thread) extends RuntimeException {
  @Override
  public S getMessage() {
    ret "Timeout after " + iceil(timeoutSeconds) + "s by " + shorten_str(function);
  }
  
  cached S innerStackTrace() {
    ret renderStackTrace(thread.getStackTrace());
  }
  
  public Throwable getCause() {
    ret new Throwable("Still calculating") {
      public void fillInStackStrace() {
        stackTrace = innerStackTrace();
      }
    };
  }
}