link_to_unless and link_to_unless_current deprecation warnings

I'm using HAML as my template engine. When using either link_to_unless or link_to_unless_current:

  - link_to_unless(controller.controller_name == 'home', 'Dashboard', root_path) do 
    %span Dashboard

I get a deprecation warning about starting with a minus. Fair enough:

  DEPRECATION WARNING: - style block helpers are deprecated. Please use =. 
  (called from  _render_template_2471452342752540530_2154256720__1773247589947495410 
  at /Users/rob/Sites/my_app/app/views/layouts/application.html.haml:37)

So, I switch to using the equals version, however now I get the number 6 output after my span!

http://skitch.com/cannikin/dpeim/active-trainer-2-the-return
http://skitch.com/cannikin/dpeip/source-of-http-localhost-3000

Happens every time, no matter the length of the text in the block. If I switch filters to :erb and then write the code, and do NOT use equals, I don't get the deprecation warning and everything outputs okay:

  :erb
    <% link_to_unless(controller.controller_name == 'home', 'Dashboard', 
root_path) do %>
      <span>Dashboard</span>
    <% end %>

If I use the = version I get an error!

  /Users/rob/Sites/my_app/app/views/layouts/application.html.haml: 
35: syntax error, unexpected ')' 
  ...), 'Dashboard', root_path) do ).to_s); _erbout.concat "\n   ... 
  ...                               ^ 
  /Users/rob/Sites/my_app/app/views/layouts/application.html.haml: 
49: syntax error, unexpected keyword_end, expecting ')' 
  end;_hamlout.push_text("    #{_h... 
     ^ 
  /Users/rob/Sites/my_app/app/views/layouts/application.html.haml: 
65: syntax error, unexpected keyword_ensure, expecting ')' 
  ...:Util.html_safe(_erbout);ensure;@haml_buffer = @haml_buffer.... 
  ...                               ^ 
  /Users/rob/Sites/my_app/app/views/layouts/application.html.haml: 
65: syntax error, unexpected keyword_end, expecting ')' 
  ...buffer = @haml_buffer.upper;end; 
  ...                               ^ 
  /Users/rob/Sites/my_app/app/views/layouts/application.html.haml: 
68: syntax error, unexpected keyword_end, expecting ')'

I posted this issue over at the HAML Google Group and Nathan (the author) says it's a Rails bug, not HAML: http://groups.google.com/group/haml/browse_thread/thread/b01da24f0d...

Thanks,
Rob