patch applied (cabal-install): Take nub by package id when making a
duncan.coutts at worc.ox.ac.uk
Tue Feb 26 21:24:55 EST 2008
Tue Feb 26 18:17:06 PST 2008 Duncan Coutts <duncan at haskell.org>
* 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
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