Resolving dependencies... Configuring cabal-doctest-1.0.6... Configuring base-orphans-0.8... Building base-orphans-0.8... Building cabal-doctest-1.0.6... Installed cabal-doctest-1.0.6 Configuring call-stack-0.1.0... Building call-stack-0.1.0... Installed base-orphans-0.8 Configuring hashable-1.2.7.0... Building hashable-1.2.7.0... Installed call-stack-0.1.0 Configuring integer-logarithms-1.0.2.2... Building integer-logarithms-1.0.2.2... Installed integer-logarithms-1.0.2.2 Configuring parallel-3.2.2.0... Building parallel-3.2.2.0... Installed hashable-1.2.7.0 Configuring primitive-0.6.4.0... Building primitive-0.6.4.0... Installed parallel-3.2.2.0 Configuring reflection-2.1.4... Building reflection-2.1.4... Installed reflection-2.1.4 Configuring semigroups-0.18.5... Building semigroups-0.18.5... Installed semigroups-0.18.5 Configuring stm-2.5.0.0... Building stm-2.5.0.0... Installed primitive-0.6.4.0 Configuring tagged-0.8.6... Building tagged-0.8.6... Installed stm-2.5.0.0 Configuring th-abstraction-0.2.8.0... Building th-abstraction-0.2.8.0... Installed tagged-0.8.6 Configuring transformers-compat-0.6.2... Building transformers-compat-0.6.2... Installed th-abstraction-0.2.8.0 Configuring void-0.7.2... Building void-0.7.2... Installed void-0.7.2 Configuring unordered-containers-0.2.9.0... Installed transformers-compat-0.6.2 Configuring vector-0.12.0.1... Building unordered-containers-0.2.9.0... Building vector-0.12.0.1... Installed unordered-containers-0.2.9.0 Configuring scientific-0.3.6.2... Building scientific-0.3.6.2... Installed scientific-0.3.6.2 Configuring StateVar-1.1.1.1... Building StateVar-1.1.1.1... Installed StateVar-1.1.1.1 Configuring distributive-0.6... Building distributive-0.6... Installed distributive-0.6 Configuring transformers-base-0.4.5.2... Building transformers-base-0.4.5.2... Installed transformers-base-0.4.5.2 Configuring exceptions-0.10.0... Building exceptions-0.10.0... Installed exceptions-0.10.0 Configuring attoparsec-0.13.2.2... Building attoparsec-0.13.2.2... Installed vector-0.12.0.1 Configuring contravariant-1.5... Building contravariant-1.5... Installed contravariant-1.5 Configuring comonad-5.0.4... Building comonad-5.0.4... Installed attoparsec-0.13.2.2 Installed comonad-5.0.4 Configuring bifunctors-5.5.3... Building bifunctors-5.5.3... Installed bifunctors-5.5.3 Configuring profunctors-5.3... Configuring semigroupoids-5.3.1... Building profunctors-5.3... Building semigroupoids-5.3.1... Installed profunctors-5.3 Configuring invariant-0.5.1... Building invariant-0.5.1... Installed semigroupoids-5.3.1 Configuring free-5.1... Building free-5.1... Installed invariant-0.5.1 Installed free-5.1 Configuring adjunctions-4.4... Building adjunctions-4.4... Installed adjunctions-4.4 Configuring kan-extensions-5.2... Building kan-extensions-5.2... Installed kan-extensions-5.2 Configuring lens-4.17... Building lens-4.17... Installed lens-4.17 Configuring yak-0.1.0.0... Building yak-0.1.0.0... Failed to install yak-0.1.0.0 Build log ( /home/builder/.cabal/logs/ghc-8.4.3/yak-0.1.0.0-32Gmq9KsamTEuP7L0JAyRd.log ): cabal: Entering directory '/tmp/cabal-tmp-23012/yak-0.1.0.0' Configuring yak-0.1.0.0... Preprocessing library for yak-0.1.0.0.. Building library for yak-0.1.0.0.. [1 of 7] Compiling Network.Yak.Modes ( src/Network/Yak/Modes.hs, dist/build/Network/Yak/Modes.o ) src/Network/Yak/Modes.hs:85:1: warning: [-Wunused-imports] The import of ‘Data.Semigroup’ is redundant except perhaps to import instances from ‘Data.Semigroup’ To import instances alone, use: import Data.Semigroup() | 85 | import Data.Semigroup | ^^^^^^^^^^^^^^^^^^^^^ [2 of 7] Compiling Network.Yak.TH ( src/Network/Yak/TH.hs, dist/build/Network/Yak/TH.o ) [3 of 7] Compiling Network.Yak.Types ( src/Network/Yak/Types.hs, dist/build/Network/Yak/Types.o ) src/Network/Yak/Types.hs:254:28: error: • No instance for (Semigroup (SList a)) arising from the 'deriving' clause of a data type declaration Possible fix: use a standalone 'deriving instance' declaration, so you can specify the instance context yourself • When deriving the instance for (Monoid (SList a)) | 254 | Traversable, Monoid, Alternative, Generic) | ^^^^^^ src/Network/Yak/Types.hs:275:28: error: • No instance for (Semigroup (CList a)) arising from the 'deriving' clause of a data type declaration Possible fix: use a standalone 'deriving instance' declaration, so you can specify the instance context yourself • When deriving the instance for (Monoid (CList a)) | 275 | Traversable, Monoid, Alternative, Generic) | ^^^^^^ cabal: Leaving directory '/tmp/cabal-tmp-23012/yak-0.1.0.0' cabal: Error: some packages failed to install: yak-0.1.0.0-32Gmq9KsamTEuP7L0JAyRd failed during the building phase. The exception was: ExitFailure 1