diff (Capistrano::Deploy::SCM::Accurev)

    # File lib/capistrano/recipes/deploy/scm/accurev.rb, line 95
            def diff(from, to=head)
              from = InternalRevision.parse(from)
              to = InternalRevision.parse(to)

              from_stream = "#{from.stream}-capistrano-diff-from"
              to_stream = "#{to.stream}-capistrano-diff-to"

              [
                change_or_create_stream(from_stream, from),
                change_or_create_stream(to_stream, to),
                scm(:diff, '-v', from_stream, '-V', to_stream, '-a')
              ].join(' && ')
            end