Resolving dependencies... Configuring data-inttrie-0.1.2... Configuring mtl-2.2.1... Building data-inttrie-0.1.2... Building mtl-2.2.1... Configuring primitive-0.6.1.0... Installed data-inttrie-0.1.2 Downloading data-memocombinators-0.4.3... Building primitive-0.6.1.0... Configuring data-memocombinators-0.4.3... Installed mtl-2.2.1 Building data-memocombinators-0.4.3... Failed to install data-memocombinators-0.4.3 Build log ( /home/builder/.cabal/logs/data-memocombinators-0.4.3.log ): cabal: Entering directory '/tmp/cabal-tmp-26133/data-memocombinators-0.4.3' Configuring data-memocombinators-0.4.3... Building data-memocombinators-0.4.3... Preprocessing library data-memocombinators-0.4.3... [1 of 1] Compiling Data.MemoCombinators ( Data/MemoCombinators.hs, dist/build/Data/MemoCombinators.o ) Data/MemoCombinators.hs:119:10: error: • Could not deduce (Num a) arising from a use of ‘IntTrie.apply’ from the context: (Ord a, Bits a) bound by the type signature for: bits :: (Ord a, Bits a) => Memo a at Data/MemoCombinators.hs:118:1-33 Possible fix: add (Num a) to the context of the type signature for: bits :: (a -> r) -> a -> r or the type signature for: bits :: (Ord a, Bits a) => Memo a • In the expression: IntTrie.apply (fmap f IntTrie.identity) In an equation for ‘bits’: bits f = IntTrie.apply (fmap f IntTrie.identity) cabal: Leaving directory '/tmp/cabal-tmp-26133/data-memocombinators-0.4.3' Installed primitive-0.6.1.0 Configuring vector-0.11.0.0... Building vector-0.11.0.0... Installed vector-0.11.0.0 cabal: Error: some packages failed to install: data-memocombinators-0.4.3 failed during the building phase. The exception was: ExitFailure 1 monad-ox-0.1.0 depends on data-memocombinators-0.4.3 which failed to install.