Resolving dependencies...
Configuring data-category-0.3.1...
Building data-category-0.3.1...
Failed to install data-category-0.3.1
Build log ( /home/builder/.cabal/logs/data-category-0.3.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-7155/data-category-0.3.1'
Configuring data-category-0.3.1...
Building data-category-0.3.1...
Preprocessing library data-category-0.3.1...
[ 1 of 17] Compiling Data.Category    ( Data/Category.hs, dist/build/Data/Category.o )

Data/Category.hs:30:10: error:
    Unexpected type ‘(~>)’
    In the type declaration for ‘Obj’
    A type declaration should have form
      type Obj a b = ...
cabal: Leaving directory '/tmp/cabal-tmp-7155/data-category-0.3.1'
cabal: Error: some packages failed to install:
data-category-0.3.1 failed during the building phase. The exception was:
ExitFailure 1