rails 3.1, simple_form, mit haml?

Wie würde ich dies Schreibe simple_form in haml:

<%= simple_form_for (@quiz) do |f| %>
<%= f.error_notification %>
  <div class="inputs">
    <%= f.input :body %>
    <%= f.fields_for :quiz_choices do |builder| %>
         <%= render "quiz_choice_fields", :f => builder %>
    <% end %>
    <p><%= link_to_add_association  "Add a choice",f, :quiz_choices %></p>
  </div>

  <div class="actions">
    <%= f.button :submit %>
  </div>
<% end %>

Hier ist mein Versuch:

- simple_form_for (@quiz) do |f|
- f.error_notification
  .inputs
    = f.input :body
    - f.fields_for :quiz_choices do |builder|
    = render "quiz_choice_fields", :f => builder

    %p= link_to_add_association  "Add a choice",f, :quiz_choices
  .actions
    = f.button :submit

Hier ist der Fehler:

Extrahiert Quelle (um Zeile #12):

9:   .actions
10:     = f.button :submit