Hi, trying to install haskeline together with other packages using cabal-install-0.14.0 resulted in a failure due to a too restrictive constraint.
cabal install mtl haskeline --dry-run Resolving dependencies... In order, the following would be installed (use -v for more details): haskeline-0.4
# because mtl-2.1.1 is already installed This installation of haskeline-0.4 fails!
cabal install transformers haskeline --dry-run Resolving dependencies... In order, the following would be installed (use -v for more details): mtl-1.1.1.1 haskeline-0.6.4.6
cabal install haskeline --dry-run Resolving dependencies... In order, the following would be installed (use -v for more details):
# transformers-0.3.0.0 is already installed transformers-0.2.2.0 mtl-2.0.1.0 haskeline-0.6.4.6 Cheers Christian