Ruby data inliner

__data__.rb

module Kernel
  def __DATA__
    s, m = "", false
  
    ::File.open caller.first.split(/:\d+:in/).first, "r" do |io|
      io.each_line do |line|
        next s << line if m
        m = line =~ /^__END__$/
      end
    end

    fail NameError, "uninitialized constant __DATA__" unless m

    s
  end
end

README.md

Usage

require "yaml"
require "__data__"

class Status
  REASONS = YAML.load __DATA__
end

__END__

200: OK
404: Not Found