anchor.diff:  <% end %>
   <% unless section.constants.empty? %>
   .Ss Constants
  -.Bl -tag
  +\&
   <% section.constants.each do |constant| %>
  -.It Dv <%= constant.name %> Li = <%= escape constant.value %>
  +.Ss Dv <%= constant.name %> Li = <%= escape constant.value %>
   <% if constant.described? %>
   <%= constant.description %>
   <% else %>
  
positive.code: .Pp
  <% end %>
  <% end %>
  .El
  <% end %>
  <% section.class.method_types.each do |type| %>
  <% unless section.methods_of_type(type).empty? %>
  .Ss <%= type.capitalize %> Methods
  .Bl -tag
  <% section.methods_of_type(type).each do |method| %>
  .It Fn "<%= escape method.visibility %> <%= escape method.name %>" <%=
  method.parameters.map { |p| quote(escape(p)) }.join(" ") %>
  <% if method.has_invocation_examples? %>
  .Bd -literal
  
negative.code: .El
  <% end %>
  <% end %>
  <% end %>
  <% end %>
  <% end %>
  