Resolving dependencies...
Configuring random-1.1...
Building random-1.1...
Installed random-1.1
Configuring combinat-0.2.7.1...
Building combinat-0.2.7.1...
Failed to install combinat-0.2.7.1
Build log ( /home/builder/.cabal/logs/combinat-0.2.7.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-1918/combinat-0.2.7.1'
Configuring combinat-0.2.7.1...
Building combinat-0.2.7.1...
Preprocessing library combinat-0.2.7.1...
[ 1 of 32] Compiling Math.Combinat.Trees.Nary[boot] ( Math/Combinat/Trees/Nary.hs-boot, dist/build/Math/Combinat/Trees/Nary.o-boot )
[ 2 of 32] Compiling Math.Combinat.Trees.Binary[boot] ( Math/Combinat/Trees/Binary.hs-boot, dist/build/Math/Combinat/Trees/Binary.o-boot )

Math/Combinat/Trees/Binary.hs-boot:7:1: warning: [-Wdodgy-imports]
    The import item ‘Forest(..)’ suggests that
    ‘Forest’ has (in-scope) constructors or class methods,
    but it has none

Math/Combinat/Trees/Binary.hs-boot:7:1: warning: [-Wunused-imports]
    The import of ‘Data.Tree’ is redundant
      except perhaps to import instances from ‘Data.Tree’
    To import instances alone, use: import Data.Tree()
[ 3 of 32] Compiling Math.Combinat.Trees.Graphviz ( Math/Combinat/Trees/Graphviz.hs, dist/build/Math/Combinat/Trees/Graphviz.o )

Math/Combinat/Trees/Graphviz.hs:17:1: warning: [-Wunused-imports]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()

Math/Combinat/Trees/Graphviz.hs:27:21: warning: [-Wname-shadowing]
    This binding for ‘lines’ shadows the existing binding
      imported from ‘Prelude’ at Math/Combinat/Trees/Graphviz.hs:4:8-35
      (and originally defined in ‘base-4.9.0.0:Data.OldList’)

Math/Combinat/Trees/Graphviz.hs:44:3: warning: [-Wname-shadowing]
    This binding for ‘lines’ shadows the existing binding
      imported from ‘Prelude’ at Math/Combinat/Trees/Graphviz.hs:4:8-35
      (and originally defined in ‘base-4.9.0.0:Data.OldList’)

Math/Combinat/Trees/Graphviz.hs:59:3: warning: [-Wname-shadowing]
    This binding for ‘lines’ shadows the existing binding
      imported from ‘Prelude’ at Math/Combinat/Trees/Graphviz.hs:4:8-35
      (and originally defined in ‘base-4.9.0.0:Data.OldList’)

Math/Combinat/Trees/Graphviz.hs:85:3: warning: [-Wname-shadowing]
    This binding for ‘lines’ shadows the existing binding
      imported from ‘Prelude’ at Math/Combinat/Trees/Graphviz.hs:4:8-35
      (and originally defined in ‘base-4.9.0.0:Data.OldList’)

Math/Combinat/Trees/Graphviz.hs:106:3: warning: [-Wname-shadowing]
    This binding for ‘lines’ shadows the existing binding
      imported from ‘Prelude’ at Math/Combinat/Trees/Graphviz.hs:4:8-35
      (and originally defined in ‘base-4.9.0.0:Data.OldList’)
[ 4 of 32] Compiling Math.Combinat.Sign ( Math/Combinat/Sign.hs, dist/build/Math/Combinat/Sign.o )

Math/Combinat/Sign.hs:9:1: warning: [-Wunused-imports]
    The import of ‘Data.Monoid’ is redundant
      except perhaps to import instances from ‘Data.Monoid’
    To import instances alone, use: import Data.Monoid()
[ 5 of 32] Compiling Math.Combinat.Partitions.Vector ( Math/Combinat/Partitions/Vector.hs, dist/build/Math/Combinat/Partitions/Vector.o )

Math/Combinat/Partitions/Vector.hs:13:1: warning: [-Wunused-imports]
    The import of ‘Data.List’ is redundant
      except perhaps to import instances from ‘Data.List’
    To import instances alone, use: import Data.List()

Math/Combinat/Partitions/Vector.hs:39:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘worker’: Patterns not matched: []

Math/Combinat/Partitions/Vector.hs:39:17: warning: [-Wname-shadowing]
    This binding for ‘last’ shadows the existing binding
      imported from ‘Data.List’ at Math/Combinat/Partitions/Vector.hs:13:1-16
      (and originally defined in ‘GHC.List’)

Math/Combinat/Partitions/Vector.hs:47:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘decrease’: Patterns not matched: []

Math/Combinat/Partitions/Vector.hs:47:13: warning: [-Wname-shadowing]
    This binding for ‘last’ shadows the existing binding
      imported from ‘Data.List’ at Math/Combinat/Partitions/Vector.hs:13:1-16
      (and originally defined in ‘GHC.List’)

Math/Combinat/Partitions/Vector.hs:56:24: warning: [-Wname-shadowing]
    This binding for ‘c’ shadows the existing binding
      bound at Math/Combinat/Partitions/Vector.hs:52:19

Math/Combinat/Partitions/Vector.hs:56:26: warning: [-Wname-shadowing]
    This binding for ‘u’ shadows the existing binding
      bound at Math/Combinat/Partitions/Vector.hs:52:21

Math/Combinat/Partitions/Vector.hs:63:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘subtract_rec’: Patterns not matched: []

Math/Combinat/Partitions/Vector.hs:63:16: warning: [-Wname-shadowing]
    This binding for ‘all’ shadows the existing binding
      imported from ‘Data.List’ at Math/Combinat/Partitions/Vector.hs:13:1-16
      (and originally defined in ‘Data.Foldable’)

Math/Combinat/Partitions/Vector.hs:63:21: warning: [-Wname-shadowing]
    This binding for ‘last’ shadows the existing binding
      imported from ‘Data.List’ at Math/Combinat/Partitions/Vector.hs:13:1-16
      (and originally defined in ‘GHC.List’)

Math/Combinat/Partitions/Vector.hs:68:3: warning: [-Wname-shadowing]
    This binding for ‘subtract’ shadows the existing binding
      imported from ‘Prelude’ at Math/Combinat/Partitions/Vector.hs:8:8-38
      (and originally defined in ‘GHC.Num’)
[ 6 of 32] Compiling Math.Combinat.Partitions.Multiset ( Math/Combinat/Partitions/Multiset.hs, dist/build/Math/Combinat/Partitions/Multiset.o )
[ 7 of 32] Compiling Math.Combinat.Numbers.Primes ( Math/Combinat/Numbers/Primes.hs, dist/build/Math/Combinat/Numbers/Primes.o )

Math/Combinat/Numbers/Primes.hs:47:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘sieve’: Patterns not matched: _ [] _

Math/Combinat/Numbers/Primes.hs:57:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘fold3t’:
        Patterns not matched:
            []
            ([]:_)

Math/Combinat/Numbers/Primes.hs:59:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘pairs’:
        Patterns not matched:
            []
            ([]:_)
            [(_:_)]

Math/Combinat/Numbers/Primes.hs:62:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘gaps’: Patterns not matched: _ [] _

Math/Combinat/Numbers/Primes.hs:65:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘roll’: Patterns not matched: _ [] _

Math/Combinat/Numbers/Primes.hs:69:3: warning: [-Wunused-local-binds]
    Defined but not used: ‘minus’

Math/Combinat/Numbers/Primes.hs:99:14: warning: [-Wname-shadowing]
    This binding for ‘k’ shadows the existing binding
      bound at Math/Combinat/Numbers/Primes.hs:98:11

Math/Combinat/Numbers/Primes.hs:100:22: warning: [-Wname-shadowing]
    This binding for ‘k’ shadows the existing binding
      bound at Math/Combinat/Numbers/Primes.hs:98:11

Math/Combinat/Numbers/Primes.hs:223:11: warning: [-Wname-shadowing]
    This binding for ‘bs’ shadows the existing binding
      bound at Math/Combinat/Numbers/Primes.hs:215:3
[ 8 of 32] Compiling Math.Combinat.Helper ( Math/Combinat/Helper.hs, dist/build/Math/Combinat/Helper.o )

Math/Combinat/Helper.hs:8:1: warning: [-Wunused-imports]
    The import of ‘Control.Monad’ is redundant
      except perhaps to import instances from ‘Control.Monad’
    To import instances alone, use: import Control.Monad()

Math/Combinat/Helper.hs:13:1: warning: [-Wunused-imports]
    The import of ‘Data.Set’ is redundant
      except perhaps to import instances from ‘Data.Set’
    To import instances alone, use: import Data.Set()

Math/Combinat/Helper.hs:14:1: warning: [-Wunused-imports]
    The import of ‘Data.Map’ is redundant
      except perhaps to import instances from ‘Data.Map’
    To import instances alone, use: import Data.Map()

Math/Combinat/Helper.hs:27:1: warning:
    SPECIALISE pragma for non-overloaded function ‘swap’

Math/Combinat/Helper.hs:28:1: warning:
    SPECIALISE pragma for non-overloaded function ‘swap’

Math/Combinat/Helper.hs:83:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘go’: Patterns not matched: []

Math/Combinat/Helper.hs:88:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘go’: Patterns not matched: _ []

Math/Combinat/Helper.hs:92:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘go’: Patterns not matched: _ []

Math/Combinat/Helper.hs:171:10: warning: [-Wname-shadowing]
    This binding for ‘y’ shadows the existing binding
      bound at Math/Combinat/Helper.hs:169:16
[ 9 of 32] Compiling Math.Combinat.Numbers ( Math/Combinat/Numbers.hs, dist/build/Math/Combinat/Numbers.o )

Math/Combinat/Numbers.hs:164:5: warning: [-Wname-shadowing]
    This binding for ‘n’ shadows the existing binding
      bound at Math/Combinat/Numbers.hs:162:3
[10 of 32] Compiling Math.Combinat.Permutations ( Math/Combinat/Permutations.hs, dist/build/Math/Combinat/Permutations.o )

Math/Combinat/Permutations.hs:75:1: warning: [-Wunused-imports]
    The import of ‘binomial’
    from module ‘Math.Combinat.Numbers’ is redundant

Math/Combinat/Permutations.hs:139:3: warning: [-Wincomplete-patterns]
    Pattern match(es) are non-exhaustive
    In an equation for ‘pairs’: Patterns not matched: []

Math/Combinat/Permutations.hs:225:1: warning: [-Wunused-top-binds]
    Defined but not used: ‘signValueOfPermutation’

Math/Combinat/Permutations.hs:277:1: warning: [-Wtabs]
    Tab character found here, and in two further locations.
    Please use spaces instead.
[11 of 32] Compiling Math.Combinat.Sets ( Math/Combinat/Sets.hs, dist/build/Math/Combinat/Sets.o )

Math/Combinat/Sets.hs:31:1: warning: [-Wunused-imports]
    The import of ‘Data.Array.MArray’ is redundant
      except perhaps to import instances from ‘Data.Array.MArray’
    To import instances alone, use: import Data.Array.MArray()

Math/Combinat/Sets.hs:159:1: warning: [-Wunused-top-binds]
    Defined but not used: ‘makeChoiceFromIndicesNaive’
[12 of 32] Compiling Math.Combinat.Tuples ( Math/Combinat/Tuples.hs, dist/build/Math/Combinat/Tuples.o )
[13 of 32] Compiling Math.Combinat.FreeGroups ( Math/Combinat/FreeGroups.hs, dist/build/Math/Combinat/FreeGroups.o )

Math/Combinat/FreeGroups.hs:46:13: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:65:16: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:65:26: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:73:7: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:86:7: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:118:12: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:127:12: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:139:25: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:139:35: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:139:45: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:146:27: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:146:37: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:153:25: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:153:42: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:202:23: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:202:33: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:202:43: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:206:23: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:206:33: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:206:43: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:210:30: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:210:40: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:210:50: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:217:25: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:217:35: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:223:25: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:223:42: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:235:25: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:235:35: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:241:25: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:241:42: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:255:32: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:255:42: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:264:25: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:264:42: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:274:33: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:274:55: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:280:29: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1

Math/Combinat/FreeGroups.hs:280:45: error:
    Ambiguous occurrence ‘Word’
    It could refer to either ‘Prelude.Word’,
                             imported from ‘Prelude’ at Math/Combinat/FreeGroups.hs:6:8-31
                             (and originally defined in ‘ghc-prim-0.5.0.0:GHC.Types’)
                          or ‘Math.Combinat.FreeGroups.Word’,
                             defined at Math/Combinat/FreeGroups.hs:36:1
cabal: Leaving directory '/tmp/cabal-tmp-1918/combinat-0.2.7.1'
cabal: Error: some packages failed to install:
combinat-0.2.7.1 failed during the building phase. The exception was:
ExitFailure 1