Here's a couple of minor code cleanups.
2 patches for repository http://darcs.net:
Sat Mar 20 17:11:20 GMT 2010 Ganesh Sittampalam <ganesh@earth.li>
* change test to not remove directories afterwards
Sun Mar 21 23:48:17 GMT 2010 Ganesh Sittampalam <ganesh@earth.li>
* replace 'assert' function with equivalent 'guard' from Control.Monad