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: demumble.rb
    path of file: ./repos/homebrew-core/Formula/d
    
    the code of the file until where you have to start completion: class Demumble < Formula
  desc "More powerful symbol demangler (a la c++filt)"
  homepage "https://github.com/nico/
    
  def install
    system "cmake", "-S", ".", "-B", "build", *std_cmake_args
    system "cmake", "--build", "build"

    # CMakeLists.txt does not contain install rules
    bin.install "build/demumble"
  end

  test do
    mangled = "__imp_?FLAGS_logtostderr@fLB@@3_NA"
    demangled = "__imp_bool fLB::FLAGS_logtostderr"
    assert_equal demangled, pipe_output(bin/"demumble", mangled)
  end
end