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: cloneable.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/rake-12.0.0/lib/rake
    
    the code of the file until where you have to start completion: module Rake
  ##
  # Mixin for c
    
    def initialize_copy(source)
      super
      source.instance_variables.each do |var|
        src_value  = source.instance_variable_get(var)
        value = src_value.clone rescue src_value
        instance_variable_set(var, value)
      end
    end