trifecta: override dependency versions

"jailbreak" did not work for this package
Also, I force a downgrade for "hashable" to make stuff work with our current haskell platform. If you don't like running things "below spec", you can add the following to packageOverrides:

haskellPackages_ghc763 = pkgs.haskellPackages_ghc763.override {
  extraPrefs = self: {
    hashable = self.hashable_1_2_1_0;
  };
};

pkgs/development/libraries/haskell/trifecta/default.nix

@@ -14,6 +14,12 @@ cabal.mkDerivation (self: {
     reducers semigroups transformers unorderedContainers utf8String
   ];
   testDepends = [ doctest filepath ];
+  postPatch = ''
+    substituteInPlace trifecta.cabal \
+      --replace "blaze-html           >= 0.5     && < 0.6," "blaze-html           >= 0.5     && < 0.7," \
+      --replace "hashable             >= 1.2     && < 1.3," "hashable             >= 1.1     && < 1.3," \
+      --replace "fingertree           >= 0.0.1   && < 0.1," "fingertree           >= 0.0.1   && < 0.2,"
+  '';
   meta = {
     homepage = "http://github.com/ekmett/trifecta/";
     description = "A modern parser combinator library with convenient diagnostics";