How do I use the Tango LineIterator.scan()?

[Robert Kosek]

Hi all,

I'm working on Kata 9 of <codekata.pragprog.com>; thus far there have 
been interesting problems, but now I need scan functionality.

How does Tango's LineIterator.scan() work?  I'm still very new to D, so 
I realize this is a template function and object, but I have no idea how 
to actually use the function in this case.  Can someone give me an 
exemplary snippet or explanation on how it works?

Thanks,
Robert