Pinging @soc: Since you've done a lot of refactoring in the compiler, would you be willing to help with cleaning up the `-Xlint` warnings in the compiler/library code? I can also help, but I'm fully booked until the beginning of august.
```
[quick.library] 12 warnings found
[quick.reflect] 9 warnings found
[quick.compiler] 28 warnings found
[quick.repl] 7 warnings found
[quick.actors] 8 warnings found
[quick.scalap] four warnings found
[quick.partest] 10 warnings found
[quick.scaladoc] four warnings found
[quick.interactive] two warnings found
[quick.plugins] one warning found
```