mtl library in HEAD?
dons at galois.com
Thu Sep 2 03:44:39 EDT 2010
>> The library installs fine with earlier versions of Haskell. Is there
>> something wrong with my installation, or is this a new
>> incompatibility? If the latter, is a corrected version of the mtl
>> library going to be available soon? Alternatively, how can I fix it?
> Yes, this is a new incompatibility. The instance in question recently
> moved from the mtl package to the base package, after discussion on this
> Until the next release of ghc/base/mtl, it will be necessary to use the
> HEAD versions of all of them (not merely the HEAD of ghc).
And indeed ,the inverse patch has been applied to mtl,
Fri Jul 30 17:40:34 CEST 2010 Ross Paterson <ross at soi.city.ac.uk>
* move Monad and MonadFix instances for Either to base (proposal #4159)
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