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: dtools.rb
    path of file: ./repos/homebrew-core/Formula/d
    
    the code of the file until where you have to start completion: class Dtools < Formula
  desc "D programming language tools"
  homepage "https://dlang.org/"
  url "https://github.com/dlang/
    
  def install
    # We only need the "public" tools, as listed at
    # https://github.com/dlang/tools/blob/master/README.md
    #
    # Skip building dman as it requires getting and building the DMD
    # and dlang.org source trees.
    tools = %w[ddemangle rdmd dustmite]
    system "dub", "add-local", buildpath

    tools.each do |tool|
      system "dub", "build", "--build=release", ":#{tool}"
      bin.install "dtools_#{tool}" => tool
    end

    man1.install "man/man1/rdmd.1"
  end