yesodweb/yesodweb.com-content — pull request #65 by bergmark (2013-08-22 13:02:13+00:00)
Title: persistent: first example needs EmptyDataDecls

```
src/Main.hs:12:1:
`Unique' has no constructors (-XEmptyDataDecls permits this)
In the data type instance declaration for `Unique'
In the instance declaration for `PersistEntity (BlogPostGeneric backend)'

src/Main.hs:12:1:
`Unique' has no constructors (-XEmptyDataDecls permits this)
In the data type instance declaration for `Unique'
In the instance declaration for `PersistEntity (PersonGeneric backend)'
```