patch applied (cabal-install): Take nub by package id when making a dep graph

Tue Feb 26 18:17:06 PST 2008 Duncan Coutts * Take nub by package id when making a dep graph and give more detailed error messages for internal error conditions. Fixes a problem where installing a set of packages where several depended on the same package would give us a ResolvedDependency list containing multiple copies of that package. The DepGraph was expecting unique packages. Resolving package deps and generating install plans needs more thought and better specified invariants. M ./Hackage/DepGraph.hs -6 +19 View patch online: http://darcs.haskell.org/cabal-install/_darcs/patches/20080227021706-adfee-5...