code: func WithErrorHandler(value fab.ErrorHandler) coptions.Opt {
  	return func(p coptions.Params) {
  		logger.Debugf("Checking errHandlerSetter")
  		if setter, ok := p.(errHandlerSetter); ok {
  			logger.Debugf("... setting error handler")
  			setter.SetErrorHandler(value)
  		}
  	}
  }
docs: // WithErrorHandler sets the error handler