[Haskell-cafe] How to cabal fetch mtl==18.104.22.168?
ia at stryx.demon.co.uk
Thu Nov 25 02:52:09 CET 2010
F:\Util\Haskell>cabal fetch mtl==22.214.171.124
cabal: internal error: could not construct a valid install plan.
The proposed (invalid) plan contained the following problems:
The following packages are involved in a dependency cycle transformers-0.2.2.0,
cabal-install version 0.8.2
using version 126.96.36.199 of the Cabal library
Could someone please remind me of the correct incantation to make this work.
(I observe that transformers-0.1.4.0 optionally (by cabal flag) depends on
special-functors, and special-functors-1.0 depends on mtl. So given that mtl-2
no doubt depends on transformers, I can see the potential for confusion, but
there presumably must be a way of breaking the (apparent) loop.)
Iain Alexander ia at stryx.demon.co.uk
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