patch applied (cabal-install): Improve InstallPlan error checking and reporting

Tue May 6 20:34:38 EDT 2008

Sun May  4 13:18:57 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Improve InstallPlan error checking and reporting
  Instead of just reporting that a plan is invalid, produce a
  detailed list of reasons why it is invalid.
  This should be useful for people debugging dependency resolvers.
  Also rename the complete property to closed, since the property
  is about the set being closed under the dependency relation.
  Also re-use the PackageIndex functions for checking the validity
  conditions rather than re-implementing the checks locally.

    M ./Hackage/InstallPlan.hs -105 +234

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20080504201857-adfee-87a10bfc726b382c6bec4fbc58ef5a9770b51e58.gz