You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: notifier.rb
    path of file: ./repos/powerstation/powerstation/lib/compiled-jruby/lib/ruby/stdlib/irb
    
    the code of the file until where you have to start completion: #
#   notifier.rb - output methods used by irb
#   	$Release Version: 0.9.6$
#   	$Revision$
#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#

require "e2mmap"
require "irb/output-method"

module IRB
  # An output formatte
    
      def level_notifier=(value)
        case value
        when AbstractNotifier
          @level_notifier = value
        when Integer
          l = @notifiers[value]
          Notifier.Raise ErrUndefinedNotifier, value unless l
          @level_notifier = l
        else
          Notifier.Raise ErrUnrecognizedLevel, value unless l
        end