When you want to add an empty `interface` as a parameter to a `func` it does not show that item in the autocomplete box. <img width="592" alt="screen shot 1394-05-22 at 8 18 58 pm" src="https://cloud.githubusercontent.com/assets/1999772/9254618/c3ba781e-41f9-11e5-8857-d368086126aa.png">