patch applied (cabal-branches/cabal-1.4): Check invariant on every construction and elide on lookups

Wed May 14 08:41:04 PDT 2008 Duncan Coutts * Check invariant on every construction and elide on lookups M ./Distribution/Simple/PackageIndex.hs -10 +12 View patch online: http://darcs.haskell.org/cabal-branches/cabal-1.4/_darcs/patches/20080514154...