anchor.diff:  <%# Expects the ID of the current post, if any, to be passed in `id`.
       `bodies` causes the bodies of the posts to be displayed when true.
       Pass a hash generated by `.arrange`. `subthread` is internal-use
  -    only.  %>
  -<% subthread ||= false %>
  -<% for post, subthreads in thread do %>
  +  only.  %>
  +<% def render_thread(thread, subthread, bodies, id)
  +     for post, subthreads in thread do %>
     <% if bodies && post.poofed && !post.next_version %>
       <div class="poof-hider">
         <a href="#" style="font-weight: bold;" data-toggle="collapse" data-target="#thread-from-<%= post.id %>">
  
positive.code:     <% end %>
      <% if bodies && post.poofed && !post.next_version%></div> <% end %>
    <% end %>
  <% end %>
  
negative.code:       <% end %>
      </li>
      <ul class="subthread list-unstyled">
        <%= render_thread(subthreads, true, bodies, id) %>
      </ul>
  
      <% unless subthread %>
          </div>
  