anchor.diff:  
     <%= body.gsub(/^/, '  ') %>
   <% end %>
  -
  -
   <% if exception.respond_to?(:backtrace)  %>
   <% if exception.backtrace.present?  %>
     ===================================================================
  
positive.code: A <%= exception.class.to_s %> occured: <%= exception.message.to_s %>
  
  
  <% if body = extract_body(@env) %>
  
    ===================================================================
  
negative.code: 
    <%= exception.backtrace.join("\n  ") %>
  <% end %>
  <% if exception.cause.present?  %>
    ===================================================================
    Cause:
  