patch applied (cabal-install): Have Constraints.constrain report the excluded packages

[Duncan Coutts]

Sat Oct  4 16:50:06 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Have Constraints.constrain report the excluded packages
  Each time we apply a constraint we can end up excluding some
  extra package. Report that list of packages because it is
  quite interesting information to get insight into what the
  resolver is actually doing.

    M ./Distribution/Client/Dependency/TopDown.hs -17 +22
    M ./Distribution/Client/Dependency/TopDown/Constraints.hs -4 +5

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20081004235006-adfee-707eb2c39e75346f6d1a01430c86022f5647608d.gz