Support for the Ruby 2.4 series has ended. See here for reference.
NoMsgNotifier is a LeveledNotifier that's used as the default notifier when creating a new CompositeNotifier.
This notifier is used as the zero index, or level 0, for CompositeNotifier#notifiers, and will not output messages of any sort.
Ensures notifications are ignored, see AbstractNotifier#notify? for more information.
# File irb/notifier.rb, line 225
def notify?
false
end