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: mqttui.rb
    path of file: ./repos/homebrew-core/Formula/m
    
    the code of the file until where you have to start completion: class Mqttui < Formula
  desc "Subscribe to a MQTT Topic or p
    
  def install
    system "cargo", "install", *std_cargo_args

    zsh_completion.install "target/completions/_mqttui"
    bash_completion.install "target/completions/mqttui.bash"
    fish_completion.install "target/completions/mqttui.fish"
  end