Resolving dependencies...
Warning: bool-extras.cabal: A package using 'cabal-version: >=1.6' must use
section syntax. See the Cabal user guide for details.
Configuring bool-extras-0.3.0...
Building bool-extras-0.3.0...
Preprocessing library bool-extras-0.3.0...
[1 of 1] Compiling Data.Bool.Extras ( src/Data/Bool/Extras.hs, dist/build/Data/Bool/Extras.o )

src/Data/Bool/Extras.hs:50:9:
    Ambiguous occurrence ‘bool’
    It could refer to either ‘Data.Bool.Extras.bool’,
                             defined at src/Data/Bool/Extras.hs:39:1
                          or ‘Data.Bool.bool’,
                             imported from ‘Data.Bool’ at src/Data/Bool/Extras.hs:27:1-16

src/Data/Bool/Extras.hs:57:10:
    Ambiguous occurrence ‘bool’
    It could refer to either ‘Data.Bool.Extras.bool’,
                             defined at src/Data/Bool/Extras.hs:39:1
                          or ‘Data.Bool.bool’,
                             imported from ‘Data.Bool’ at src/Data/Bool/Extras.hs:27:1-16

src/Data/Bool/Extras.hs:64:9:
    Ambiguous occurrence ‘bool’
    It could refer to either ‘Data.Bool.Extras.bool’,
                             defined at src/Data/Bool/Extras.hs:39:1
                          or ‘Data.Bool.bool’,
                             imported from ‘Data.Bool’ at src/Data/Bool/Extras.hs:27:1-16

src/Data/Bool/Extras.hs:71:9:
    Ambiguous occurrence ‘bool’
    It could refer to either ‘Data.Bool.Extras.bool’,
                             defined at src/Data/Bool/Extras.hs:39:1
                          or ‘Data.Bool.bool’,
                             imported from ‘Data.Bool’ at src/Data/Bool/Extras.hs:27:1-16

src/Data/Bool/Extras.hs:83:9:
    Ambiguous occurrence ‘bool’
    It could refer to either ‘Data.Bool.Extras.bool’,
                             defined at src/Data/Bool/Extras.hs:39:1
                          or ‘Data.Bool.bool’,
                             imported from ‘Data.Bool’ at src/Data/Bool/Extras.hs:27:1-16
Failed to install bool-extras-0.3.0
cabal: Error: some packages failed to install:
bool-extras-0.3.0 failed during the building phase. The exception was:
ExitFailure 1
language-cil-0.2.0 depends on bool-extras-0.3.0 which failed to install.