Resolving dependencies...
Configuring dimensional-0.7.2...
Building dimensional-0.7.2...
Failed to install dimensional-0.7.2
Build log ( /home/builder/.cabal/logs/dimensional-0.7.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-20474/dimensional-0.7.2'
[1 of 1] Compiling Main             ( /tmp/cabal-tmp-20474/dimensional-0.7.2/dist/setup/setup.hs, /tmp/cabal-tmp-20474/dimensional-0.7.2/dist/setup/Main.o )
Linking /tmp/cabal-tmp-20474/dimensional-0.7.2/dist/setup/setup ...
Configuring dimensional-0.7.2...
Warning: No 'build-type' specified. If you do not need a custom Setup.hs or
./configure script then use 'build-type: Simple'.
Building dimensional-0.7.2...
Preprocessing library dimensional-0.7.2...
[1 of 8] Compiling Numeric.NumType  ( Numeric/NumType.lhs, dist/build/Numeric/NumType.o )

Numeric/NumType.lhs:240:12: error:
    • Illegal instance declaration for ‘Sum a b c’
        The liberal coverage condition fails in class ‘Sum’
          for functional dependency: ‘a c -> b’
        Reason: lhs types ‘a’, ‘c’ do not jointly determine rhs type ‘b’
        Un-determined variable: b
    • In the instance declaration for ‘Sum a b c’
cabal: Leaving directory '/tmp/cabal-tmp-20474/dimensional-0.7.2'
cabal: Error: some packages failed to install:
dimensional-0.7.2 failed during the building phase. The exception was:
ExitFailure 1