Resolving dependencies...
Configuring primitive-0.6.2.0...
Configuring random-1.1...
Building primitive-0.6.2.0...
Building random-1.1...
Configuring validity-0.3.0.4...
Installed random-1.1
Building validity-0.3.0.4...
Installed validity-0.3.0.4
Installed primitive-0.6.2.0
Configuring tf-random-0.5...
Building tf-random-0.5...
Installed tf-random-0.5
Configuring QuickCheck-2.9.2...
Building QuickCheck-2.9.2...
Installed QuickCheck-2.9.2
Configuring genvalidity-0.2.0.4...
Building genvalidity-0.2.0.4...
Installed genvalidity-0.2.0.4
Configuring genvalidity-containers-0.1.0.1...
Building genvalidity-containers-0.1.0.1...
Failed to install genvalidity-containers-0.1.0.1
Build log ( /home/builder/.cabal/logs/genvalidity-containers-0.1.0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-7872/genvalidity-containers-0.1.0.1'
Configuring genvalidity-containers-0.1.0.1...
Building genvalidity-containers-0.1.0.1...
Preprocessing library genvalidity-containers-0.1.0.1...
[1 of 2] Compiling Data.GenValidity.Tree ( src/Data/GenValidity/Tree.hs, dist/build/Data/GenValidity/Tree.o )

src/Data/GenValidity/Tree.hs:9:10: error:
    • Could not deduce (Validity (Tree a))
        arising from the superclasses of an instance declaration
      from the context: GenValidity a
        bound by the instance declaration
        at src/Data/GenValidity/Tree.hs:9:10-46
    • In the instance declaration for ‘GenValidity (Tree a)’
cabal: Leaving directory '/tmp/cabal-tmp-7872/genvalidity-containers-0.1.0.1'
cabal: Error: some packages failed to install:
genvalidity-containers-0.1.0.1 failed during the building phase. The exception
was:
ExitFailure 1