Can before_filter using Proc and specify block ?

Hi,

I see from this post

http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/97e333daab05b725/8252c90cb9c36f6d?lnk=gst&q=passing+parameter+before_filter#8252c90cb9c36f6d

it can specify the Proc in the before_filter function, but when
specify when action apply this filter, it raise an syntax error, such
as rthe following code

before_filter {|controller| c.send(:catalog_access,
[current_user])}, :only=>[:manage_catalog]

Will raise an syntax error

app/controllers/catalogs_controller.rb:7: syntax error, unexpected
',', expecting kEND
before_filter {|controller| c.send(:catalog_access,
[current_user])}, :only=>[:manage_catalog]

Is before_filter using Proc can specify which action to filtering
with ?

Thank,
Patrick