[Xmonad] darcs patch: XPrompt: fixes a nasty bug in getLastWord

[Donald Bruce Stewart]

mailing_list:
> 
> New patches:
> 
> [XPrompt: fixes a nasty bug in getLastWord
> Andrea Rossato <andrea.rossato at unibz.it>**20070815163457
>  This patch fixes a nasty bug in getLastWord, a bug that causes XMonad
>  to crash as soon as the command line consists of only 2 empty spaces.
>  *PLEASE UPDATE* if you are running XPrompt.

Applied. 

The instability in this module is a little concerning: any way you can
write some tests for it? (Perhaps use QC to generate strings or
something?). 

Proper QuickCheck tests for the pure code would be welcome, and reassure
users. I can give some examples, if you're unsure with QuickCheck.

-- Don