Resolving dependencies...
Downloading open-union-0.1.0.0...
Configuring open-union-0.1.0.0...
Building open-union-0.1.0.0...
Failed to install open-union-0.1.0.0
Build log ( /home/builder/.cabal/logs/open-union-0.1.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-8494/open-union-0.1.0.0'
Configuring open-union-0.1.0.0...
Building open-union-0.1.0.0...
Preprocessing library open-union-0.1.0.0...

Data/OpenUnion.hs:5:1: error: parse error on input ‘<<<<<<<’
cabal: Leaving directory '/tmp/cabal-tmp-8494/open-union-0.1.0.0'
cabal: Error: some packages failed to install:
open-union-0.1.0.0 failed during the building phase. The exception was:
ExitFailure 1