render :layout does not work as per the documentation

If you pass arguments to “yield” then this will be passed to the block. One way to use this is to pass an array to layout and treat it as an enumerable.

<%# app/views/users/_user.html.erb &>
<div class="user">
  Budget: $<%= user.budget %>
  <%= yield user %>
</div>

<%# app/views/users/index.html.erb &>
<%= render :layout => @users do |user| %>
  Title: <%= user.title %>
<% end %>

This will render the layout for each user and yield to the block, passing the user, each time.

You can also yield multiple times in one layout and use block arguments to differentiate the sections.

<%# app/views/users/_user.html.erb &>
<div class="user">
  <%= yield user, :header %>
  Budget: $<%= user.budget %>
  <%= yield user, :footer %>
</div>

<%# app/views/users/index.html.erb &>
<%= render :layout => @users do |user, section| %>
  <%- case section when :header -%>
     Title: <%= user.title %>
  <%- when :footer -%>
    Deadline: <%= user.deadline %>
  <%- end -%>
<% end %>

I am trying out above scenarios on Rails 3.0.1 and it does not work. I get a error saying that no
block given.

Is the documentation missing something ??