[Xmonad] darcs patch: add pureMessage.

[David Roundy]

Dons suggested this, and it sounded like a nice idea to me.
Alas, only one user in core, but several contrib modules could
use it.  I'm not sure how useful this will be for quickchecking,
as we'll need to create an Arbitrary instance for an existential
type, which means we'd need some sort of trickery to create tests
relevant to each layout.

David

Fri Oct  5 10:05:53 EDT 2007  David Roundy <droundy at darcs.net>
  * add pureMessage.

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