
Some general purpose tools in haskell-packages.nix have no GHC version string baked in their name, i.e. alex, haddock, and happy. "nix-env -u" prefers the first match it finds. Thus, if haskellPackages_ghc6104 et al would have the same priority as haskellPackages, then nix-env would choose those the old variants of these tools, because they are listed first. svn path=/nixpkgs/trunk/; revision=28433
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