Resolving dependencies...
Configuring thrist-0.0...
Building thrist-0.0...
Failed to install thrist-0.0
Build log ( /home/builder/.cabal/logs/thrist-0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-21784/thrist-0.0'
Configuring thrist-0.0...
Building thrist-0.0...
Preprocessing library thrist-0.0...
[1 of 1] Compiling Data.Thrist      ( Data/Thrist.hs, dist/build/Data/Thrist.o )

Data/Thrist.hs:11:29: error:
    Illegal symbol '.' in type
    Perhaps you intended to use RankNTypes or a similar language
    extension to enable explicit-forall syntax: forall <tvs>. <type>
cabal: Leaving directory '/tmp/cabal-tmp-21784/thrist-0.0'
cabal: Error: some packages failed to install:
thrist-0.0 failed during the building phase. The exception was:
ExitFailure 1