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: configure_proxy.rb
    path of file: ./repos/fluentd/lib/fluent/config
    
    the code of the file until where you have to start completion: #
# Fluentd
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, softwar
    
      def merge_for_finalized(other)
        # list what subclass can do for finalized section
        #  * append params/defaults/sections which are missing in superclass
        #  * change default values of superclass
        #  * overwrite init to make it enable to instantiate section objects with added default values

        if other.final == false && overwrite?(other, :final)
          raise ConfigError, "BUG: subclass cannot overwrite finalized base class's config_section"
        end

        [:param_name, :required, :multi, :alias, :configured_in_section].each do |prohibited_name|
          if overwrite?(other, prohibited_name)
            raise ConfigError, "BUG: subclass cannot overwrite base class's config_section: #{prohibited_name}"
          end
        end