anchor.diff:      <tr>
         <td></td>
         <td>[new building]</td>
  -      <td>
  +      <td class="input_col">
           <form action="/tribes/<%= @tribe.slug %>/buildings" method="post">
             <select name="building_name">
               <% @buildings.each do |building| %>
  
positive.code:   <tr>
      <td>Priests:</td>
      <td><%= @tribe.priests %></td>
      <td>
        <% if @tribe.has_building?("temple") %>
          <form action="/tribes/<%= @tribe.slug %>/priests" method="post">
            <input type="hidden" name="_method" value="patch">
  
negative.code:   <tr>
      <td>Total population:</td>
      <td><%= @tribe.population.total %></td>
      <td class="input_col"></td>
    </tr>
    <tr>
      <td>Population density:</td>
      <td><%= @tribe.population.density %>/mi<sup>2</sup></td>
      <td class="input_col"></td>
    </tr>
    <tr>
      <td>Warriors:</td>
      <td><%= @tribe.warriors %></td>
      <td class="input_col">
        <% if @tribe.has_building?("barracks") %>
          <form action="/tribes/<%= @tribe.slug %>/warriors" method="post">
            <input type="hidden" name="_method" value="patch">
  