Resolving dependencies...
Downloading open-union-0.1.0...
Configuring open-union-0.1.0...
Building open-union-0.1.0...
Preprocessing library open-union-0.1.0...

Data/OpenUnion.hs:5:1: parse error on input `<<<<<<<'
Failed to install open-union-0.1.0
cabal: Error: some packages failed to install:
open-union-0.1.0 failed during the building phase. The exception was:
ExitFailure 1