safe wrappers for some base functions
Partial functions from the base library, such as @head@ and @!!@,
modified to return more descriptive error messages, programmer
defined error messages, `Maybe' wrapped results and default values.
These functions can be used to reduce the number of unsafe pattern
matches in your code.

Maintainer: Matthias Kilian <kili@openbsd.org>

WWW: http://community.haskell.org/~ndm/safe/
