patch applied (cabal): Switch a few debug Show instances to use derived Show

[Duncan Coutts]

Mon Mar 24 19:27:03 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Switch a few debug Show instances to use derived Show
  The pretty printer version should be using Text but I've left them as
  comments for the moment as they do not have corresponding parsers yet.

    M ./Distribution/PackageDescription.hs -39 +30

View patch online:

  http://darcs.haskell.org/cabal/_darcs/patches/20080325022703-adfee-d93274311412aff7b33c9f1c3d00340640f536b6.gz