Resolving dependencies...
Configuring validity-0.4.0.2...
Building validity-0.4.0.2...
Installed validity-0.4.0.2
Configuring genvalidity-0.4.0.3...
Building genvalidity-0.4.0.3...
Failed to install genvalidity-0.4.0.3
Build log ( /home/builder/.cabal/logs/ghc-8.2.2/genvalidity-0.4.0.3-JcaOgW0rMPxKf8SaHJCy9h.log ):
cabal: Entering directory '/tmp/cabal-tmp-12016/genvalidity-0.4.0.3'
Configuring genvalidity-0.4.0.3...
Preprocessing library for genvalidity-0.4.0.3..
Building library for genvalidity-0.4.0.3..
[1 of 3] Compiling Data.GenValidity ( src/Data/GenValidity.hs, dist/build/Data/GenValidity.o )

src/Data/GenValidity.hs:421:10: error:
    • Could not deduce (Validity (Ratio a))
        arising from the superclasses of an instance declaration
      from the context: (Integral a, Num a, Ord a, GenValid a)
        bound by the instance declaration
        at src/Data/GenValidity.hs:421:10-69
    • In the instance declaration for ‘GenValid (Ratio a)’
    |
421 | instance (Integral a, Num a, Ord a, GenValid a) => GenValid (Ratio a)
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-12016/genvalidity-0.4.0.3'
cabal: Error: some packages failed to install:
genvalidity-0.4.0.3-JcaOgW0rMPxKf8SaHJCy9h failed during the building phase.
The exception was:
ExitFailure 1