report method
Log the error. Dox calls it for every error that is not an
IHttpException (those are normal answers like 404 or 422), and for
errors outside a request, like a future that nobody awaited.
The default prints the error and the stack with the logger.
Implementation
void report(Object error, StackTrace stackTrace) {
Logger.warn(error);
Logger.danger(stackTrace.toString());
}