class RSpec::Core::Formatters::ExceptionPresenter

def failure_lines
  @failure_lines ||= [].tap do |lines|
    lines.concat(failure_slash_error_lines)
    sections = [failure_slash_error_lines, exception_lines]
    if sections.any? { |section| section.size > 1 } && !exception_lines.first.empty?
      lines << ''
    end
    lines.concat(exception_lines)
    lines.concat(extra_failure_lines)
  end
end