Resolving dependencies... Configuring MonadRandom-0.1.12... Building MonadRandom-0.1.12... Preprocessing library MonadRandom-0.1.12... [1 of 2] Compiling Control.Monad.Random.Class ( Control/Monad/Random/Class.hs, dist/build/Control/Monad/Random/Class.o ) [2 of 2] Compiling Control.Monad.Random ( Control/Monad/Random.hs, dist/build/Control/Monad/Random.o ) In-place registering MonadRandom-0.1.12... Running Haddock for MonadRandom-0.1.12... Running hscolour for MonadRandom-0.1.12... Preprocessing library MonadRandom-0.1.12... Preprocessing library MonadRandom-0.1.12... Haddock coverage: Warning: Control.Monad.Random.Class: getRandom is exported separately but will be documented under MonadRandom. Consider exporting it together with its parent(s) for code clarity. Warning: Control.Monad.Random.Class: getRandomR is exported separately but will be documented under MonadRandom. Consider exporting it together with its parent(s) for code clarity. Warning: Control.Monad.Random.Class: getRandoms is exported separately but will be documented under MonadRandom. Consider exporting it together with its parent(s) for code clarity. Warning: Control.Monad.Random.Class: getRandomRs is exported separately but will be documented under MonadRandom. Consider exporting it together with its parent(s) for code clarity. Warning: Control.Monad.Random.Class: getSplit is exported separately but will be documented under MonadSplit. Consider exporting it together with its parent(s) for code clarity. 100% ( 3 / 3) in 'Control.Monad.Random.Class' 100% ( 16 / 16) in 'Control.Monad.Random' Documentation created: dist/doc/html/MonadRandom/index.html Installing library in /srv/hackage/var/build/tmp-install/lib/x86_64-linux-ghc-7.6.3/MonadRandom-0.1.12 Registering MonadRandom-0.1.12... Installed MonadRandom-0.1.12 Downloading valid-names-0.1.0.1... Configuring valid-names-0.1.0.1... Building valid-names-0.1.0.1... Preprocessing library valid-names-0.1.0.1... [1 of 3] Compiling Language.Valid.Private ( src/Language/Valid/Private.hs, dist/build/Language/Valid/Private.o ) [2 of 3] Compiling Language.Valid.Random ( src/Language/Valid/Random.hs, dist/build/Language/Valid/Random.o ) src/Language/Valid/Random.hs:10:18: Module `Data.Set' does not export `elemAt' Failed to install valid-names-0.1.0.1 cabal: Error: some packages failed to install: valid-names-0.1.0.1 failed during the building phase. The exception was: ExitFailure 1