Resolving dependencies... Starting microlens-0.4.11.2 Starting exceptions-0.10.4 Starting primitive-0.7.1.0 Starting hashable-1.3.0.0 Building microlens-0.4.11.2 Building exceptions-0.10.4 Building primitive-0.7.1.0 Building hashable-1.3.0.0 Completed microlens-0.4.11.2 Starting transformers-compat-0.6.5 Completed hashable-1.3.0.0 Starting unliftio-core-0.2.0.1 Building transformers-compat-0.6.5 Completed exceptions-0.10.4 Starting unordered-containers-0.2.12.0 Building unliftio-core-0.2.0.1 Building unordered-containers-0.2.12.0 Completed unliftio-core-0.2.0.1 Starting async-2.2.2 Building async-2.2.2 Completed transformers-compat-0.6.5 Starting microlens-mtl-0.2.0.1 Building microlens-mtl-0.2.0.1 Completed async-2.2.2 Starting unliftio-0.2.13 Building unliftio-0.2.13 Completed microlens-mtl-0.2.0.1 Completed primitive-0.7.1.0 Starting resourcet-1.2.4.2 Building resourcet-1.2.4.2 Completed unordered-containers-0.2.12.0 Completed resourcet-1.2.4.2 Starting little-rio-0.2.1 Building little-rio-0.2.1 Failed to install little-rio-0.2.1 Build log ( /home/builder/.cabal/logs/ghc-8.6.3/little-rio-0.2.1-8Nw2LUp2S3W5XPGLK5JBhJ.log ): cabal: Entering directory '/tmp/cabal-tmp-21777/little-rio-0.2.1' Configuring little-rio-0.2.1... Preprocessing library for little-rio-0.2.1.. Building library for little-rio-0.2.1.. [1 of 2] Compiling LittleRIO ( src/LittleRIO.hs, dist/build/LittleRIO.o ) src/LittleRIO.hs:60:80: error: Not in scope: type constructor or class ‘MonadFail’ | 60 | deriving (Functor, Applicative, Monad, MonadReader env, MonadIO, MonadThrow, MonadFail, MonadCatch, MonadMask, MonadUnliftIO) | ^^^^^^^^^ cabal: Leaving directory '/tmp/cabal-tmp-21777/little-rio-0.2.1' Completed unliftio-0.2.13 cabal: Error: some packages failed to install: little-rio-0.2.1-8Nw2LUp2S3W5XPGLK5JBhJ failed during the building phase. The exception was: ExitFailure 1 ref-extras-0.2.0-DIn4wE5qNaJbcluzquGfh depends on ref-extras-0.2.0 which failed to install.