Ah, so this happens because GHC HEAD has Cabal-1.23.0.0 bundled with it. I see. And as Cabal master is also 1.23.0.0 they don’t really work together (i.e. cabal-install uses system Cabal).
Ok, maybe we can wait till GHC’s Cabal reference-commit will be bumped, if not already. Thanks for the explanation. - Oleg > On 19 Aug 2015, at 19:19, Edward Z. Yang <[email protected]> wrote: > > Oh, this is irritating. > > The problem is we recently updated Cabal the library to get rid of > InstalledPackageInfo_ (so there is only InstalledPackageInfo now) > but it looks like in some situations cabal-install can be compiled > with an old version of Cabal (as is happening to you). I suppose > an appropriate remedy is to bump the Cabal library dependency in > cabal-install so we don't attempt to use the old Cabal; alternately > we could preprocessor macro to make it work in both cases. > > Edward > > Excerpts from Oleg Grenrus's message of 2015-08-19 07:46:56 -0700: >> I tried to fix compilation of Cabal using Cabal HEAD. It’s trivial patch: >> >> https://github.com/phadej/cabal/commit/525e0680505c74f42a321e55b357a27222790628 >> >> but it breaks build on every other released GHC: >> >> https://travis-ci.org/phadej/cabal/builds/76288656 >> >> — >> >> The original issue GHC-7.11 complained was: >> >> Distribution/Client/Types.hs:71:10: error: >> Illegal instance declaration for >> ‘PackageFixedDeps InstalledPackageInfo’ >> (All instance types must be of the form (T t1 ... tn) >> where T is not a synonym. >> Use TypeSynonymInstances if you want to disable this.) >> In the instance declaration for >> ‘PackageFixedDeps InstalledPackageInfo’ >> >> So I had to add TypeSynonymInstances and FlexibleInstances >> >> And also had to change import of InstalledPackageInfo(exposed) in Haddock >> module. >> >> — >> >> At this point I’m really confused. I cannot find ‘InstalledPackageInfo_’ >> symbol anywhere. Can someone explain what happens? >
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