class IRB::Notifier::NoMsgNotifier

CompositeNotifier#notifiers, and will not output messages of any sort.
This notifier is used as the zero index, or level 0, for
when creating a new CompositeNotifier.
NoMsgNotifier is a LeveledNotifier that’s used as the default notifier

def initialize

Creates a new notifier that should not be used to output messages. 
def initialize
  @base_notifier = nil
  @level = 0
  @prefix = ""
end

def notify?

more information.
Ensures notifications are ignored, see AbstractNotifier#notify? for 
def notify?
  false
end