ruby--ruby/lib/rdoc/generator/template/darkfish/_sidebar_parent.rhtml

<% if klass.type == 'class' then %>
<div id="parent-class-section" class="nav-section">
  <h3>Parent</h3>

  <% if klass.superclass and not String === klass.superclass then %>
  <p class="link"><a href="<%= klass.aref_to klass.superclass.path %>"><%= klass.superclass.full_name %></a>
  <% else %>
  <p class="link"><%= klass.superclass %>
  <% end %>
</div>
<% end %>