Resolving dependencies...
Configuring ansi-terminal-0.6.2.3...
Configuring text-1.2.2.1...
Building ansi-terminal-0.6.2.3...
Building text-1.2.2.1...
Installed ansi-terminal-0.6.2.3
Installed text-1.2.2.1
Configuring hashable-1.2.4.0...
Building hashable-1.2.4.0...
Installed hashable-1.2.4.0
Configuring hashmap-1.3.2...
Building hashmap-1.3.2...
Installed hashmap-1.3.2
Configuring wordsetdiff-0.0.2...
Building wordsetdiff-0.0.2...
Failed to install wordsetdiff-0.0.2
Build log ( /home/builder/.cabal/logs/wordsetdiff-0.0.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-1858/wordsetdiff-0.0.2'
Configuring wordsetdiff-0.0.2...
Building wordsetdiff-0.0.2...
Preprocessing executable 'wordsetdiff' for wordsetdiff-0.0.2...

Text/WordSetDiff/Main.hs:76:2: error:
     warning: #warning "Using HashMap instead of Data.Map" [-Wcpp]
     #warning "Using HashMap instead of Data.Map"
      ^
[1 of 1] Compiling Main             ( Text/WordSetDiff/Main.hs, dist/build/wordsetdiff/wordsetdiff-tmp/Main.o )

Text/WordSetDiff/Main.hs:162:31: error:
    Ambiguous occurrence ‘toStrict’
    It could refer to either ‘BC.toStrict’,
                             imported from ‘Data.ByteString.Lazy.Char8’ at Text/WordSetDiff/Main.hs:49:1-39
                             (and originally defined in ‘Data.ByteString.Lazy’)
                          or ‘Main.toStrict’, defined at Text/WordSetDiff/Main.hs:92:1
cabal: Leaving directory '/tmp/cabal-tmp-1858/wordsetdiff-0.0.2'
cabal: Error: some packages failed to install:
wordsetdiff-0.0.2 failed during the building phase. The exception was:
ExitFailure 1