Resolving dependencies...
Configuring HMap-0.902...
Building HMap-0.902...
Failed to install HMap-0.902
Build log ( /home/builder/.cabal/logs/HMap-0.902.log ):
cabal: Entering directory '/tmp/cabal-tmp-13092/HMap-0.902'
Configuring HMap-0.902...
Building HMap-0.902...
Preprocessing library HMap-0.902...
[1 of 1] Compiling Data.HMap        ( Data/HMap.hs, dist/build/Data/HMap.o )

Data/HMap.hs:171:1: error:
    • ‘T’ has no constructors (EmptyDataDecls permits this)
    • In the data declaration for ‘T’
cabal: Leaving directory '/tmp/cabal-tmp-13092/HMap-0.902'
cabal: Error: some packages failed to install:
HMap-0.902 failed during the building phase. The exception was:
ExitFailure 1