Resolving dependencies... Downloading hood2-0.2.1... Configuring hood2-0.2.1... Building hood2-0.2.1... Preprocessing library hood2-0.2.1... [1 of 1] Compiling Debug.Hood.Observe ( Debug/Hood/Observe.lhs, dist/build/Debug/Hood/Observe.o ) Debug/Hood/Observe.lhs:380:10: Not in scope: type constructor or class ‘Applicative’ Failed to install hood2-0.2.1 cabal: Error: some packages failed to install: hood2-0.2.1 failed during the building phase. The exception was: ExitFailure 1