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: module_paths.rb
    path of file: ./repos/metasploit-framework/lib/msf/core/module_manager
    
    the code of the file until where you have to start completion: # -*- coding: binary -*-
#
# Gems
#
require 'active_support/concern'
require 'active_support/core_ext/hash'
require 'active_support/core_ext/module'

# Deals with module paths in the {Msf::ModuleManager}
module Msf::ModuleManager::ModulePaths
  extend ActiveSupport::Concern

  # Adds a path to be searched for new 
    
  def add_module_path(path, opts={}, recalculate: true)
    nested_paths = []

    # remove trailing file separator
    path_without_trailing_file_separator = path.sub(/#{File::SEPARATOR}$/, '')

    # Make the path completely canonical
    pathname = Pathname.new(path_without_trailing_file_separator).expand_path

    # Make sure the path is a valid directory
    unless pathname.directory?
      raise ArgumentError, "The path supplied is not a valid directory.", caller
    end