Min constraint on mtl breaks LTS Haskell and causes cabal hell

[mwu-tow]

The change resulting from #14 broke my builds.
I use stack and lts-2.22 resolver (latest available for GHC 7.8.4). The lts-2.22 contains:
MonadRandom 0.3.0.2
mtl 2.1.3.1

Overriding mtl requires bumping transformers as well (GHC 7.8.4 ships 0.3.0.0) and that breaks compilation of ghc-mtl-1.2.1.0 and causes warnings about packages depending on multiple version of the same package and that things will likely explode. Well, I haven't been able to fix this on my side.

Please consider reverting the mtl constraint at least on MonadRandom 0.3.0.2 to fix the LTS.

[byorgey]

Yikes, I'm so sorry. I was convinced that MonadRandom would not actually build with mtl-2.1. When I relax the lower bound on mtl and try to build with mtl-2.1, this is what I get:

$ cabal install --dry-run --constraint='mtl < 2.2'
Resolving dependencies...
cabal: Could not resolve dependencies:
trying: MonadRandom-0.4 (user goal)
next goal: mtl (dependency of MonadRandom-0.4)
rejecting: mtl-2.2.1, 2.2.0.1, 2.2 (global constraint requires <2.2)
trying: mtl-2.1.3.1
trying: transformers-compat-0.4.0.4 (dependency of MonadRandom-0.4)
next goal: transformers (dependency of MonadRandom-0.4)
rejecting: transformers-0.4.2.0/installed-c1a..., 0.4.3.0, 0.4.2.0, 0.4.1.0
(conflict: mtl => transformers==0.3.*)
rejecting: transformers-0.3.0.0 (conflict: transformers-compat-0.4.0.4:three
=> transformers>=0.4.1 && <0.5)
rejecting: transformers-0.2.2.1, 0.2.2.0, 0.2.1.0, 0.2.0.0, 0.1.4.0, 0.1.3.0,
0.1.1.0, 0.1.0.1, 0.1.0.0, 0.0.1.0, 0.0.0.0 (conflict: MonadRandom =>
transformers>=0.3 && <0.5)
rejecting: transformers-0.4.0.0 (conflict: mtl => transformers==0.3.*)
Dependency tree exhaustively searched.

Now I am really confused.

[byorgey]

Hmm, but you're right that it does work with mtl-2.1 when building with stack on lts-2.22. I will revise the lower bound to include mtl-2.1.

[byorgey]

New revisions with mtl-2.1 as a lower bound are now published. Let me know if this fixes things for you.

[mwu-tow]

Yes, it fixes my issues. Thank you for the prompt reaction.

[byorgey]

Great, no problem.