00093.rb

$namespaces = []

def namespace(name, &blk)
  $namespaces << Namespace.new(name, &blk)
end

class Namespace
  def initialize(name, &blk)
    @name = name
    @thingies = []
    instance_eval(&blk)
  end

  def thingy(name)
    @thingies << name
  end
end

namespace :foo do
  thingy :bar
end

p $namespaces
# >> [#<Namespace:0x00000001ee9d40 @thingies=[:bar], @name=:foo>]