gistfile1.txt

class Foo
  def self.macros(&block)
    mod = Module.new 
    mod.module_eval do
      ANSWER = 42
    end
    self.const_set(:Macros, mod)
    Macros.module_eval do
      module_eval &block
    end
  end

  macros do
    Point = Struct.new :x, :y
    Value = 5

    def self.bar 
      "bar"
    end

    def foo
      "foo"
    end
  end
end