{cabal}: cabal.mkDerivation (self : { pname = "mtl"; version = "1.1.0.2"; # Haskell Platform 2009.0.0 sha256 = "a225aaf2b1e337f40c31e5c42f95eec9a4608322b0e4c135d2b31b8421a58d36"; meta = { description = "Monad transformer library"; }; })