Resolving dependencies...
Configuring colour-2.3.3...
Configuring data-ordlist-0.4.7.0...
Building colour-2.3.3...
Building data-ordlist-0.4.7.0...
Installed data-ordlist-0.4.7.0
Configuring primitive-0.6.2.0...
Building primitive-0.6.2.0...
Configuring random-1.1...
Installed colour-2.3.3
Building random-1.1...
Configuring transformers-compat-0.5.1.4...
Installed primitive-0.6.2.0
Configuring text-1.2.2.2...
Installed random-1.1
Building transformers-compat-0.5.1.4...
Building text-1.2.2.2...
Installed transformers-compat-0.5.1.4
Configuring ansi-terminal-0.7.1.1...
Building ansi-terminal-0.7.1.1...
Configuring vector-0.12.0.1...
Installed ansi-terminal-0.7.1.1
Building vector-0.12.0.1...
Installed text-1.2.2.2
Configuring ansi-wl-pprint-0.6.8.1...
Building ansi-wl-pprint-0.6.8.1...
Installed ansi-wl-pprint-0.6.8.1
Configuring hashable-1.2.6.1...
Building hashable-1.2.6.1...
Configuring optparse-applicative-0.14.0.0...
Installed hashable-1.2.6.1
Building optparse-applicative-0.14.0.0...
Installed optparse-applicative-0.14.0.0
Configuring unordered-containers-0.2.8.0...
Building unordered-containers-0.2.8.0...
Installed vector-0.12.0.1
Installed unordered-containers-0.2.8.0
Configuring perfect-hash-generator-0.1.0.1...
Building perfect-hash-generator-0.1.0.1...
Failed to install perfect-hash-generator-0.1.0.1
Build log ( /home/builder/.cabal/logs/perfect-hash-generator-0.1.0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-8371/perfect-hash-generator-0.1.0.1'
Configuring perfect-hash-generator-0.1.0.1...
Building perfect-hash-generator-0.1.0.1...
Preprocessing library perfect-hash-generator-0.1.0.1...
[1 of 3] Compiling Data.PerfectHash.Hashing ( src/Data/PerfectHash/Hashing.hs, dist/build/Data/PerfectHash/Hashing.o )
[2 of 3] Compiling Data.PerfectHash.Lookup ( src/Data/PerfectHash/Lookup.hs, dist/build/Data/PerfectHash/Lookup.o )
[3 of 3] Compiling Data.PerfectHash.Construction ( src/Data/PerfectHash/Construction.hs, dist/build/Data/PerfectHash/Construction.o )
Preprocessing executable 'hash-perfectly-ints-demo' for
perfect-hash-generator-0.1.0.1...
[1 of 2] Compiling Exercise         ( test/Exercise.hs, dist/build/hash-perfectly-ints-demo/hash-perfectly-ints-demo-tmp/Exercise.o )
[2 of 2] Compiling IntsDemo         ( demo/IntsDemo.hs, dist/build/hash-perfectly-ints-demo/hash-perfectly-ints-demo-tmp/IntsDemo.o )

<no location info>: error:
    output was redirected with -o, but no output will be generated
because there is no Main module.
cabal: Leaving directory '/tmp/cabal-tmp-8371/perfect-hash-generator-0.1.0.1'
cabal: Error: some packages failed to install:
perfect-hash-generator-0.1.0.1 failed during the building phase. The exception
was:
ExitFailure 1