module RSpec::Core::Metadata::GroupMetadataHash

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