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Configuring lord-2.20131220...
Building lord-2.20131220...
Failed to install lord-2.20131220
Build log ( /home/builder/.cabal/logs/lord-2.20131220.log ):
cabal: Entering directory '/tmp/cabal-tmp-30331/lord-2.20131220'
Configuring lord-2.20131220...
Building lord-2.20131220...
Preprocessing executable 'lord' for lord-2.20131220...
[1 of 9] Compiling Radio.EightTracks.User ( Radio/EightTracks/User.hs, dist/build/lord/lord-tmp/Radio/EightTracks/User.o )
[2 of 9] Compiling Radio.EightTracks.Explore ( Radio/EightTracks/Explore.hs, dist/build/lord/lord-tmp/Radio/EightTracks/Explore.o )
[3 of 9] Compiling Radio            ( Radio.hs, dist/build/lord/lord-tmp/Radio.o )

Radio.hs:201:5: error:
    • Constraint ‘FromJSON (Config a)’ in the type of ‘readToken’
        constrains only the class type variables
      Use ConstrainedClassMethods to allow it
    • When checking the class method:
        readToken :: forall a.
                     (NeedLogin a, FromJSON (Config a)) =>
                     (Config a -> Param a) -> String -> IO (Maybe (Param a))
      In the class declaration for ‘NeedLogin’
cabal: Leaving directory '/tmp/cabal-tmp-30331/lord-2.20131220'
cabal: Error: some packages failed to install:
lord-2.20131220 failed during the building phase. The exception was:
ExitFailure 1