class Cucumber::Cli::Main

def enable_diffing
  if configuration.diff_enabled? && defined?(::Spec)
    begin
      require 'spec/runner/differs/default' # RSpec >=1.2.4
    rescue ::LoadError
      require 'spec/expectations/differs/default' # RSpec <=1.2.3
    end
    options = OpenStruct.new(:diff_format => :unified, :context_lines => 3)
    ::Spec::Expectations.differ = ::Spec::Expectations::Differs::Default.new(options)
  end
end