class Spec::Runner::Formatter::NestedTextFormatter

def add_example_group(example_group)
  super
  current_nested_example_groups = described_example_group_chain
  current_nested_example_groups.each_with_index do |nested_example_group, i|
    unless nested_example_group == previous_nested_example_groups[i]
      output.puts "#{'  ' * i}#{nested_example_group.description_args}"
    end
  end
  @previous_nested_example_groups = described_example_group_chain
end