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: method_space.rb
    path of file: ./repos/facets/lib/core/facets/module
    
    the code of the file until where you have to start completion: require 'facets/functor'
require 'facets/module/basename'

class Module

  # Create method namespaces, allowing for method
  # chains but still accessing the object's instance.
  #
  #   class A
  #     attr_writer :x
  #     method_space :inside d
    
  def method_space(name, mod=nil, &blk)

    ## If block is given then create a module, otherwise
    ## get the name of the module.
    if block_given?
      name = name.to_s
      raise ArgumentError if mod
      mod  = Module.new(&blk)
    else
      if Module === name
        mod = name
        name = mod.basename.downcase
      end