7 Jan
2011
7 Jan
'11
4:31 p.m.
ghc-pkg doesn't list mtl as a dependency of parsec. I didn't think I had mtl-1 installed (it's not in my .cabal directory), but now I see that it's part of the haskell base install. So now I'm wondering why cabal felt that it needed to install mtl-2 for hslogger, when I apparently already had mtl-1 installed, and hslogger doesn't list a version for its mtl dep. Is it because hslogger depends on base >= 4, while json depends on base >= 3? Does that sound like a probable cause?
I think that was the problem. I just did a new "cabal install json", and it installed it linking against mtl-2 instead of mtl-1, and the warning went away. So, I'm happy now, and I learned some new tools. yay!