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: gnu-which.rb
    path of file: ./repos/homebrew-core/Formula/g
    
    the code of the file until where you have to start completion: class GnuWhich < Formula
  desc "GNU implementation of which utility"
  # Previous homepage is dead. Have linked to the GNU Projects page for now.
  homepage "https://sav
    
  def caveats
    on_macos do
      <<~EOS
        GNU "which" has been installed as "gwhich".
        If you need to use it as "which", you can add a "gnubin" directory
        to your PATH from your bashrc like:

            PATH="#{opt_libexec}/gnubin:$PATH"
      EOS
    end
  end