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: haskell.rb
    path of file: ./repos/brew/Library/Homebrew/language
    
    the code of the file until where you have to start completion: module Language
  module Haskell
    module Cabal
      def self.included(base)
        # use llvm-gcc on Lion or below, as when building GHC)
        base.fails_with(:clang) if MacOS.version <= :lion
      end

      def cabal_sandbox(options = {})
        pwd = Pathname.pwd
        home = options[:home] || pwd

        # pretend HOME is elsewhere, so that ~/.cabal is kept as untouched
        # as possible (except for ~/.cabal/setup-exe-cache)
        # https://github.com/haskell/cabal/issues/1234
        saved_home = ENV["HOME"]
        ENV["HOME"] = home

        system "cabal", "v1-sandbox", "init"
  
    
      def install_cabal_package(*args, **options)
        cabal_sandbox do
          cabal_install_tools(*options[:using]) if options[:using]

          # if we have build flags, we have to pass them to cabal install to resolve the necessary
          # dependencies, and call cabal configure afterwards to set the flags again for compile
          flags = "--flags=#{options[:flags].join(" ")}" if options[:flags]

          args_and_flags = args
          args_and_flags << flags unless flags.nil?

          # install dependencies in the sandbox
          cabal_install "--only-dependencies", *args_and_flags

          # call configure if build flags are set
          cabal_configure flags unless flags.nil?

          # install the main package in the destination dir
          cabal_install "--prefix=#{prefix}", *args

          yield if block_given?
        end
      end