Resolving dependencies...
Configuring random-1.1...
Building random-1.1...
Installed random-1.1
Configuring ip6addr-0.3.1...
Building ip6addr-0.3.1...
Failed to install ip6addr-0.3.1
Build log ( /home/builder/.cabal/logs/ip6addr-0.3.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-22028/ip6addr-0.3.1'
Configuring ip6addr-0.3.1...
Building ip6addr-0.3.1...
Preprocessing executable 'ip6addrcan' for ip6addr-0.3.1...
[1 of 3] Compiling IPv6Addr         ( src/IPv6Addr.hs, dist/build/ip6addrcan/ip6addrcan-tmp/IPv6Addr.o )

src/IPv6Addr.hs:217:36: error:
    • Could not deduce (Eq b) arising from an operator section
      from the context: Num b
        bound by the type signature for:
                   firstLongestZerosRunIndex :: Num b => [(Bool, b)] -> b -> b
        at src/IPv6Addr.hs:215:1-61
      Possible fix:
        add (Eq b) to the context of
          the type signature for:
            firstLongestZerosRunIndex :: Num b => [(Bool, b)] -> b -> b
    • In the first argument of ‘takeWhile’, namely ‘(/= (True, y))’
      In the second argument of ‘($)’, namely
        ‘takeWhile (/= (True, y)) x’
      In the expression: sum . snd . unzip $ takeWhile (/= (True, y)) x
cabal: Leaving directory '/tmp/cabal-tmp-22028/ip6addr-0.3.1'
cabal: Error: some packages failed to install:
ip6addr-0.3.1 failed during the building phase. The exception was:
ExitFailure 1