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: compilers.rb
    path of file: ./repos/brew/Library/Homebrew
    
    the code of the file until where you have to start completion: # @private
module CompilerConstants
  GNU_GCC_VERSIONS = %w[4.9 5 6 7 8].freeze
  GNU_GCC_REGEXP = /^gcc-(4\.9|[5-8])$/.freeze
  COMPILER_SYMBOL_MAP = {
    "gcc"        => :gcc,
    "gcc-4.2"    => :gcc_4
    
  def find_compiler
    compilers.each do |compiler|
      case compiler
      when :gnu
        gnu_gcc_versions.reverse_each do |v|
          name = "gcc-#{v}"
          version = compiler_version(name)
          yield Compiler.new(name, version) unless version.null?
        end
      when :llvm
        next # no-op. DSL supported, compiler is not.
      else
        version = compiler_version(compiler)
        yield Compiler.new(compiler, version) unless version.null?
      end
    end