Resolving dependencies... Configuring mtl-2.2.1... Configuring network-2.6.3.1... Building mtl-2.2.1... Building network-2.6.3.1... Configuring text-1.2.2.1... Installed mtl-2.2.1 Building text-1.2.2.1... Installed network-2.6.3.1 Installed text-1.2.2.1 Configuring parsec-3.1.11... Building parsec-3.1.11... Installed parsec-3.1.11 Downloading lambdaBase-0.0.2.0... Configuring lambdaBase-0.0.2.0... Building lambdaBase-0.0.2.0... Failed to install lambdaBase-0.0.2.0 Build log ( /home/builder/.cabal/logs/lambdaBase-0.0.2.0.log ): cabal: Entering directory '/tmp/cabal-tmp-27631/lambdaBase-0.0.2.0' Configuring lambdaBase-0.0.2.0... Building lambdaBase-0.0.2.0... Preprocessing library lambdaBase-0.0.2.0... [1 of 3] Compiling Language.LambdaBase.Core ( Language/LambdaBase/Core.hs, dist/build/Language/LambdaBase/Core.o ) [2 of 3] Compiling Language.LambdaBase.Parser ( Language/LambdaBase/Parser.hs, dist/build/Language/LambdaBase/Parser.o ) Language/LambdaBase/Parser.hs:104:1: error: • Non type-variable argument in the constraint: Text.Parsec.Prim.Stream s m Char (Use FlexibleContexts to permit this) • When checking the inferred type notNakedName :: forall a (m :: * -> *) u s. Text.Parsec.Prim.Stream s m Char => String -> [Char] -> Text.Parsec.Prim.ParsecT s u m (Expr a) cabal: Leaving directory '/tmp/cabal-tmp-27631/lambdaBase-0.0.2.0' cabal: Error: some packages failed to install: lambdaBase-0.0.2.0 failed during the building phase. The exception was: ExitFailure 1 lambdaLit-0.1.1.0 depends on lambdaBase-0.0.2.0 which failed to install.