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 IRB::Notifier::CompositeNotifier#notifiers,
and will not output messages of any sort.
Ensures notifications are ignored, see IRB::Notifier::AbstractNotifier#notify? for more information.
# File irb/notifier.rb, line 224
def notify?
false
end
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