Resolving dependencies... Configuring dlist-0.8.0.2... Configuring base-compat-0.9.1... Building base-compat-0.9.1... Building dlist-0.8.0.2... Installed dlist-0.8.0.2 Configuring mtl-2.2.1... Building mtl-2.2.1... Configuring random-1.1... Installed base-compat-0.9.1 Building random-1.1... Configuring semigroups-0.18.2... Installed random-1.1 Configuring primitive-0.6.1.0... Installed mtl-2.2.1 Building semigroups-0.18.2... Building primitive-0.6.1.0... Configuring stm-2.4.4.1... Installed semigroups-0.18.2 Building stm-2.4.4.1... Configuring time-locale-compat-0.1.1.3... Installed stm-2.4.4.1 Configuring transformers-compat-0.5.1.4... Installed primitive-0.6.1.0 Building time-locale-compat-0.1.1.3... Building transformers-compat-0.5.1.4... Configuring text-1.2.2.1... Installed time-locale-compat-0.1.1.3 Building text-1.2.2.1... Installed transformers-compat-0.5.1.4 Configuring tf-random-0.5... Building tf-random-0.5... Installed tf-random-0.5 Configuring vector-0.11.0.0... Building vector-0.11.0.0... Installed text-1.2.2.1 Configuring exceptions-0.8.3... Building exceptions-0.8.3... Configuring tagged-0.8.5... Installed exceptions-0.8.3 Building tagged-0.8.5... Configuring QuickCheck-2.9.2... Installed tagged-0.8.5 Building QuickCheck-2.9.2... Configuring hashable-1.2.4.0... Installed vector-0.11.0.0 Building hashable-1.2.4.0... Installed hashable-1.2.4.0 Configuring unordered-containers-0.2.7.1... Building unordered-containers-0.2.7.1... Configuring scientific-0.3.4.9... Installed QuickCheck-2.9.2 Installed unordered-containers-0.2.7.1 Building scientific-0.3.4.9... Installed scientific-0.3.4.9 Configuring megaparsec-5.1.2... Configuring attoparsec-0.13.1.0... Building megaparsec-5.1.2... Building attoparsec-0.13.1.0... Installed attoparsec-0.13.1.0 Configuring aeson-1.0.2.1... Building aeson-1.0.2.1... Installed megaparsec-5.1.2 Installed aeson-1.0.2.1 Configuring language-conf-0.2.2.0... Building language-conf-0.2.2.0... Failed to install language-conf-0.2.2.0 Build log ( /home/builder/.cabal/logs/language-conf-0.2.2.0.log ): cabal: Entering directory '/tmp/cabal-tmp-9326/language-conf-0.2.2.0' Configuring language-conf-0.2.2.0... Building language-conf-0.2.2.0... Preprocessing library language-conf-0.2.2.0... [1 of 5] Compiling Data.Conf.Types ( src/Data/Conf/Types.hs, dist/build/Data/Conf/Types.o ) [2 of 5] Compiling Data.Conf.PrettyPrint ( src/Data/Conf/PrettyPrint.hs, dist/build/Data/Conf/PrettyPrint.o ) [3 of 5] Compiling Data.Conf.Internal ( src/Data/Conf/Internal.hs, dist/build/Data/Conf/Internal.o ) [4 of 5] Compiling Data.Conf.Aeson ( src/Data/Conf/Aeson.hs, dist/build/Data/Conf/Aeson.o ) src/Data/Conf/Aeson.hs:21:14: error: • Overlapping instances for FromJSON Conf arising from a use of ‘fromJSON’ Matching instances: instance FromJSON a => FromJSON [a] -- Defined in ‘aeson-1.0.2.1:Data.Aeson.Types.FromJSON’ instance FromJSON Conf -- Defined at src/Data/Conf/Aeson.hs:23:10 • In the first argument of ‘(.)’, namely ‘fromJSON’ In the expression: fromJSON . toJSON In an equation for ‘fromToJSON’: fromToJSON = fromJSON . toJSON src/Data/Conf/Aeson.hs:23:10: error: • Overlapping instances for FromJSON Conf arising from a use of ‘aeson-1.0.2.1:Data.Aeson.Types.FromJSON.$dmparseJSONList’ Matching instances: instance FromJSON a => FromJSON [a] -- Defined in ‘aeson-1.0.2.1:Data.Aeson.Types.FromJSON’ instance FromJSON Conf -- Defined at src/Data/Conf/Aeson.hs:23:10 • In the expression: aeson-1.0.2.1:Data.Aeson.Types.FromJSON.$dmparseJSONList @Conf In an equation for ‘parseJSONList’: parseJSONList = aeson-1.0.2.1:Data.Aeson.Types.FromJSON.$dmparseJSONList @Conf In the instance declaration for ‘FromJSON Conf’ src/Data/Conf/Aeson.hs:29:27: error: • Overlapping instances for FromJSON [ConfStatement] arising from a use of ‘parseJSON’ Matching instances: instance FromJSON a => FromJSON [a] -- Defined in ‘aeson-1.0.2.1:Data.Aeson.Types.FromJSON’ instance FromJSON Conf -- Defined at src/Data/Conf/Aeson.hs:23:10 • In a stmt of a 'do' block: cs <- parseJSON o In the expression: do { cs <- parseJSON o; return $ ConfStatementBlock (Block (Text.words k) cs) } In a case alternative: o@(Object _) -> do { cs <- parseJSON o; return $ ConfStatementBlock (Block (Text.words k) cs) } src/Data/Conf/Aeson.hs:46:10: error: • Overlapping instances for ToJSON Conf arising from a use of ‘aeson-1.0.2.1:Data.Aeson.Types.ToJSON.$dmtoEncoding’ Matching instances: instance ToJSON a => ToJSON [a] -- Defined in ‘aeson-1.0.2.1:Data.Aeson.Types.ToJSON’ instance ToJSON Conf -- Defined at src/Data/Conf/Aeson.hs:46:10 • In the expression: aeson-1.0.2.1:Data.Aeson.Types.ToJSON.$dmtoEncoding @Conf In an equation for ‘toEncoding’: toEncoding = aeson-1.0.2.1:Data.Aeson.Types.ToJSON.$dmtoEncoding @Conf In the instance declaration for ‘ToJSON Conf’ src/Data/Conf/Aeson.hs:46:10: error: • Overlapping instances for ToJSON Conf arising from a use of ‘aeson-1.0.2.1:Data.Aeson.Types.ToJSON.$dmtoJSONList’ Matching instances: instance ToJSON a => ToJSON [a] -- Defined in ‘aeson-1.0.2.1:Data.Aeson.Types.ToJSON’ instance ToJSON Conf -- Defined at src/Data/Conf/Aeson.hs:46:10 • In the expression: aeson-1.0.2.1:Data.Aeson.Types.ToJSON.$dmtoJSONList @Conf In an equation for ‘toJSONList’: toJSONList = aeson-1.0.2.1:Data.Aeson.Types.ToJSON.$dmtoJSONList @Conf In the instance declaration for ‘ToJSON Conf’ src/Data/Conf/Aeson.hs:46:10: error: • Overlapping instances for ToJSON Conf arising from a use of ‘aeson-1.0.2.1:Data.Aeson.Types.ToJSON.$dmtoEncodingList’ Matching instances: instance ToJSON a => ToJSON [a] -- Defined in ‘aeson-1.0.2.1:Data.Aeson.Types.ToJSON’ instance ToJSON Conf -- Defined at src/Data/Conf/Aeson.hs:46:10 • In the expression: aeson-1.0.2.1:Data.Aeson.Types.ToJSON.$dmtoEncodingList @Conf In an equation for ‘toEncodingList’: toEncodingList = aeson-1.0.2.1:Data.Aeson.Types.ToJSON.$dmtoEncodingList @Conf In the instance declaration for ‘ToJSON Conf’ src/Data/Conf/Aeson.hs:52:62: error: • Overlapping instances for ToJSON [ConfStatement] arising from a use of ‘toJSON’ Matching instances: instance ToJSON a => ToJSON [a] -- Defined in ‘aeson-1.0.2.1:Data.Aeson.Types.ToJSON’ instance ToJSON Conf -- Defined at src/Data/Conf/Aeson.hs:46:10 • In the second argument of ‘(.=)’, namely ‘toJSON css’ In the expression: k .= toJSON css In the expression: [k .= toJSON css] cabal: Leaving directory '/tmp/cabal-tmp-9326/language-conf-0.2.2.0' cabal: Error: some packages failed to install: language-conf-0.2.2.0 failed during the building phase. The exception was: ExitFailure 1