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: vulkan-volk.rb
    path of file: ./repos/homebrew-core/Formula/v
    
    the code of the file until where you have to start completion: class VulkanVolk < Formula
  desc "Meta loader for Vulkan API"
  homepage "https://github.com/zeux/volk"
  url "https:/
    
  def volk_static_defines
    res = ""
    on_macos do
      res = "VK_USE_PLATFORM_MACOS_MVK"
    end
    on_linux do
      res = "VK_USE_PLATFORM_XLIB_KHR"
    end
    res
  end