Variable assignment within templates

After updating to 0.4.0 I am no longer able to assign variables within templates.
e.g.

```
<% var listItem = list[0]; %><%= listItem.library %>
```

In this example `listItem` is undefined when trying to access the library property.

See jsfiddles:
Using 0.3.2:  http://jsfiddle.net/joshvermaire/gf84m
Using 0.4.0: http://jsfiddle.net/joshvermaire/gf84m/1
