gistfile1.txt

lambda do |fn|
  lambda { |x| x.call(x) }.call(
    lambda do |myself|
      lambda do |arg|
        fn.call(arg, myself.call(myself))
      end
    end
  )
end.call(

  # The lambda we wish to make recursive

  lambda do |arg, recurse|
    arg.kind_of?(Numeric) ? arg : arg.map { |item| recurse.call(item) }.inj\
ect(&:+)
  end

)