yeah we'd have to use a different syntax for placeholders with no default content. I'm not sure I'd do anything with the "default" content, if I was looking at a template and saw something like this:

```html
<% block head %>
  some stuff
<% endblock %>

some other content here

<% block content %>
  some stuff
<% endblock %>
```

I wouldn't really expect much out of the content in-between, at least it wouldn't be clear where it's going anyway, especially when it spans multiple blocks that are otherwise unrelated