module RSpec::Core::Metadata::GroupMetadataHash

def container_stack
  @container_stack ||= begin
                         groups = [group = self]
                         while group.has_key?(:example_group)
                           groups << group[:example_group]
                           group = group[:example_group]
                         end
                         groups
                       end
end

def described_class
  container_stack.each do |g|
    return g[:described_class] if g.has_key?(:described_class)
    return g[:describes]       if g.has_key?(:describes)
  end
  container_stack.reverse.each do |g|
    candidate = g[:description_args].first
    return candidate unless String === candidate || Symbol === candidate
  end
  nil
end

def full_description
  build_description_from(*container_stack.reverse.map {|a| a[:description_args]}.flatten)
end