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: library.rb
    path of file: ./repos/truffleruby/lib/truffle/ffi
    
    the code of the file until where you have to start completion: #
# Copyright (C) 2008-2010 Wayne Meissner
#
# This file is part of ruby-ffi.
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice
#   this list of conditions and the followin
    
    def attached_variables
      (
        (@ffi_gsvars || {}).map do |name, gvar|
          [name, gvar.class]
        end +
        (@ffi_gvars || {}).map do |name, gvar|
          [name, gvar.layout[:gvar].type]
        end
      ).to_h
    end

    # Freeze all definitions of the module
    #
    # This freezes the module's definitions, so that it can be used in a Ractor.
    # No further methods or variables can be attached and no further enums or typedefs can be created in this module afterwards.
    def freeze
      instance_variables.each do |name|
        var = instance_variable_get(name)
        FFI.make_shareable(var)
      end
      nil
    end
  end