<%= content_for :footer %> is mentioned in the docs (capture_helper.rb:
121), but is not valid at this point. I provided a simple patch below,
but there should probably be some discussion.
Any thoughts on how these two instances should be treated differently?
<% content_for :footer, @footer_content %> vs.
<%= content_for :footer, @footer_content %>
I have a more thorough exploration in the ticket.