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: mutable_struct.rb
    path of file: ./repos/brew/Library/Homebrew/vendor/bundle-standalone/ruby/2.3.0/gems/concurrent-ruby-1.1.4/lib/concurrent
    
    the code of the file until where you have to start completion: require 'concurrent/synchronization/abstract_struct'
require 'concurrent/synchronization'

module Concurrent

  # An thread-safe variation of Ruby's standard `Struct`. Values can be set at
  # construction or safely changed at any time during the object's lifecycle.
  #
  # @see http://ruby-doc.org/core-2.2.0
    
      def define_struct(name, members, &block)
        synchronize do
          clazz = Synchronization::AbstractStruct.define_struct_class(MutableStruct, Synchronization::LockableObject, name, members, &block)
          members.each_with_index do |member, index|
            clazz.send :remove_method, member
            clazz.send(:define_method, member) do
              synchronize { @values[index] }
            end
            clazz.send(:define_method, "#{member}=") do |value|
              synchronize { @values[index] = value }
            end
          end
          clazz
        end
      end