[Xmonad] darcs patch: Introduce NonEmptyStack.

[David Roundy]

Hi all,

Here's a patch implementing a NonEmptyStack type that is our
zipper without the Empty possibility.  I like this change, but
haven't cleaned up the comments as it's not clear that others
will like it.  I made modify accept a function that will only
modify NonEmptyStacks, which covers all the possibilities but
delete.

Actually, I think I'll implement a clean:q



Fri May 25 19:18:04 PDT 2007  David Roundy <droundy at darcs.net>
  * Introduce NonEmptyStack.

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