Resolving dependencies...
Configuring lca-0.1...
Building lca-0.1...
Preprocessing library lca-0.1...
[1 of 2] Compiling Data.LCA.Online.Naive ( src/Data/LCA/Online/Naive.hs, dist/build/Data/LCA/Online/Naive.o )

src/Data/LCA/Online/Naive.hs:91:11:
    Ambiguous occurrence ‘length’
    It could refer to either ‘Data.LCA.Online.Naive.length’,
                             defined at src/Data/LCA/Online/Naive.hs:62:1
                          or ‘Prelude.length’,
                             imported from ‘Data.Foldable’ at src/Data/LCA/Online/Naive.hs:30:1-36

src/Data/LCA/Online/Naive.hs:92:11:
    Ambiguous occurrence ‘length’
    It could refer to either ‘Data.LCA.Online.Naive.length’,
                             defined at src/Data/LCA/Online/Naive.hs:62:1
                          or ‘Prelude.length’,
                             imported from ‘Data.Foldable’ at src/Data/LCA/Online/Naive.hs:30:1-36

src/Data/LCA/Online/Naive.hs:103:34:
    Ambiguous occurrence ‘length’
    It could refer to either ‘Data.LCA.Online.Naive.length’,
                             defined at src/Data/LCA/Online/Naive.hs:62:1
                          or ‘Prelude.length’,
                             imported from ‘Data.Foldable’ at src/Data/LCA/Online/Naive.hs:30:1-36
Failed to install lca-0.1
cabal: Error: some packages failed to install:
lca-0.1 failed during the building phase. The exception was:
ExitFailure 1