class RSpec::Core::Formatters::ExceptionPresenter

def indent_lines(lines, failure_number)
  alignment_basis = ' ' * @indentation
  alignment_basis <<  "#{failure_number}) " if failure_number
  indentation = ' ' * alignment_basis.length
  lines.each_with_index.map do |line, index|
    if index == 0
      "#{alignment_basis}#{line}"
    elsif line.empty?
      line
    else
      "#{indentation}#{line}"
    end
  end
end