Resolving dependencies...
Configuring mtl-2.2.1...
Building mtl-2.2.1...
Installed mtl-2.2.1
Configuring STMonadTrans-0.3.4...
Building STMonadTrans-0.3.4...
Installed STMonadTrans-0.3.4
Downloading equivalence-0.1...
Configuring equivalence-0.1...
Building equivalence-0.1...
Failed to install equivalence-0.1
Build log ( /home/builder/.cabal/logs/equivalence-0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-21949/equivalence-0.1'
Configuring equivalence-0.1...
Building equivalence-0.1...
Preprocessing library equivalence-0.1...
[1 of 2] Compiling Data.Equivalence.STT ( src/Data/Equivalence/STT.hs, dist/build/Data/Equivalence/STT.o )
[2 of 2] Compiling Data.Equivalence.Monad ( src/Data/Equivalence/Monad.hs, dist/build/Data/Equivalence/Monad.o )

src/Data/Equivalence/Monad.hs:64:10: error:
    • Could not deduce (Applicative (EquivT s c v m))
        arising from the superclasses of an instance declaration
      from the context: Monad m
        bound by the instance declaration
        at src/Data/Equivalence/Monad.hs:64:10-44
    • In the instance declaration for ‘Monad (EquivT s c v m)’
cabal: Leaving directory '/tmp/cabal-tmp-21949/equivalence-0.1'
cabal: Error: some packages failed to install:
equivalence-0.1 failed during the building phase. The exception was:
ExitFailure 1