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);
  }
  
  StackTraceElement[] innerStackTrace() {
    ret thread.getStackTrace();
  }
  
  public cached Throwable getCause() {
    Throwable cause = new("Still calculating");
    cause.setStackTrace(innerStackTrace());
    ret cause;
  }
}