Resolving dependencies... Configuring OneTuple-0.2.2... Configuring StateVar-1.1.1.0... Building OneTuple-0.2.2... Building StateVar-1.1.1.0... Installed StateVar-1.1.1.0 Configuring base-compat-0.10.3... Installed OneTuple-0.2.2 Configuring base-orphans-0.8... Building base-compat-0.10.3... Building base-orphans-0.8... Installed base-orphans-0.8 Configuring base16-bytestring-0.1.1.6... Building base16-bytestring-0.1.1.6... Installed base16-bytestring-0.1.1.6 Configuring base64-bytestring-1.0.0.1... Building base64-bytestring-1.0.0.1... Installed base-compat-0.10.3 Configuring blaze-builder-0.4.1.0... Building blaze-builder-0.4.1.0... Installed base64-bytestring-1.0.0.1 Configuring cabal-doctest-1.0.6... Building cabal-doctest-1.0.6... Installed blaze-builder-0.4.1.0 Configuring call-stack-0.1.0... Building call-stack-0.1.0... Installed cabal-doctest-1.0.6 Configuring data-default-class-0.1.2.0... Installed call-stack-0.1.0 Configuring dlist-0.8.0.4... Building data-default-class-0.1.2.0... Building dlist-0.8.0.4... Installed data-default-class-0.1.2.0 Configuring fail-4.9.0.0... Building fail-4.9.0.0... Installed fail-4.9.0.0 Configuring hashable-1.2.7.0... Installed dlist-0.8.0.4 Configuring integer-logarithms-1.0.2.1... Building hashable-1.2.7.0... Building integer-logarithms-1.0.2.1... Installed integer-logarithms-1.0.2.1 Configuring network-uri-2.6.1.0... Building network-uri-2.6.1.0... Installed hashable-1.2.7.0 Configuring old-locale-1.0.0.7... Building old-locale-1.0.0.7... Installed old-locale-1.0.0.7 Configuring parallel-3.2.1.1... Building parallel-3.2.1.1... Installed network-uri-2.6.1.0 Configuring primitive-0.6.4.0... Building primitive-0.6.4.0... Installed parallel-3.2.1.1 Configuring random-1.1... Building random-1.1... Installed random-1.1 Configuring reflection-2.1.4... Building reflection-2.1.4... Installed reflection-2.1.4 Configuring safe-0.3.17... Installed primitive-0.6.4.0 Configuring say-0.1.0.0... Building safe-0.3.17... Building say-0.1.0.0... Installed say-0.1.0.0 Configuring semigroups-0.18.5... Building semigroups-0.18.5... Installed safe-0.3.17 Configuring split-0.2.3.3... Installed semigroups-0.18.5 Configuring stm-chans-3.0.0.4... Building split-0.2.3.3... Installed split-0.2.3.3 Configuring tagged-0.8.6... Building stm-chans-3.0.0.4... Building tagged-0.8.6... Installed stm-chans-3.0.0.4 Configuring th-abstraction-0.2.8.0... Installed tagged-0.8.6 Configuring time-locale-compat-0.1.1.4... Building th-abstraction-0.2.8.0... Building time-locale-compat-0.1.1.4... Installed time-locale-compat-0.1.1.4 Configuring time-units-1.0.0... Building time-units-1.0.0... Installed th-abstraction-0.2.8.0 Configuring transformers-compat-0.6.2... Building transformers-compat-0.6.2... Installed time-units-1.0.0 Configuring unliftio-core-0.1.1.0... Building unliftio-core-0.1.1.0... Installed unliftio-core-0.1.1.0 Configuring void-0.7.2... Installed transformers-compat-0.6.2 Configuring contravariant-1.5... Building void-0.7.2... Building contravariant-1.5... Installed void-0.7.2 Configuring tuple-0.3.0.2... Building tuple-0.3.0.2... Installed contravariant-1.5 Configuring data-default-instances-containers-0.0.1... Building data-default-instances-containers-0.0.1... Installed data-default-instances-containers-0.0.1 Configuring data-default-instances-dlist-0.0.1... Building data-default-instances-dlist-0.0.1... Installed data-default-instances-dlist-0.0.1 Configuring unordered-containers-0.2.9.0... Building unordered-containers-0.2.9.0... Installed unordered-containers-0.2.9.0 Configuring case-insensitive-1.2.0.11... Building case-insensitive-1.2.0.11... Installed case-insensitive-1.2.0.11 Configuring async-2.2.1... Building async-2.2.1... Installed tuple-0.3.0.2 Configuring data-default-instances-old-locale-0.0.1... Installed async-2.2.1 Configuring uuid-types-1.0.3... Building data-default-instances-old-locale-0.0.1... Building uuid-types-1.0.3... Installed data-default-instances-old-locale-0.0.1 Configuring vector-0.12.0.1... Building vector-0.12.0.1... Installed uuid-types-1.0.3 Configuring scientific-0.3.6.2... Building scientific-0.3.6.2... Installed scientific-0.3.6.2 Configuring dlist-instances-0.1.1.1... Building dlist-instances-0.1.1.1... Installed dlist-instances-0.1.1.1 Configuring distributive-0.6... Building distributive-0.6... Installed distributive-0.6 Configuring th-lift-0.7.10... Building th-lift-0.7.10... Installed th-lift-0.7.10 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 http-types-0.12.1... Building http-types-0.12.1... Installed http-types-0.12.1 Configuring unliftio-0.2.7.0... Building unliftio-0.2.7.0... Installed vector-0.12.0.1 Configuring data-default-0.7.1.1... Building data-default-0.7.1.1... Installed data-default-0.7.1.1 Configuring attoparsec-0.13.2.2... Building attoparsec-0.13.2.2... Installed unliftio-0.2.7.0 Configuring comonad-5.0.4... Building comonad-5.0.4... Installed attoparsec-0.13.2.2 Configuring monad-control-1.0.2.3... Building monad-control-1.0.2.3... Installed comonad-5.0.4 Configuring errors-2.3.0... Building errors-2.3.0... Installed monad-control-1.0.2.3 Configuring vector-algorithms-0.7.0.1... Building vector-algorithms-0.7.0.1... Installed errors-2.3.0 Configuring th-lift-instances-0.1.11... Building th-lift-instances-0.1.11... Installed th-lift-instances-0.1.11 Configuring chunked-data-0.3.1... Building chunked-data-0.3.1... Installed chunked-data-0.3.1 Configuring basic-prelude-0.7.0... Building basic-prelude-0.7.0... Installed vector-algorithms-0.7.0.1 Configuring attoparsec-iso8601-1.0.0.0... Building attoparsec-iso8601-1.0.0.0... Installed attoparsec-iso8601-1.0.0.0 Configuring aeson-1.4.0.0... Building aeson-1.4.0.0... Installed basic-prelude-0.7.0 Configuring bifunctors-5.5.2... Building bifunctors-5.5.2... Installed bifunctors-5.5.2 Configuring text-conversions-0.3.0... Building text-conversions-0.3.0... Installed text-conversions-0.3.0 Configuring uri-bytestring-0.3.2.0... Building uri-bytestring-0.3.2.0... Installed uri-bytestring-0.3.2.0 Configuring mono-traversable-1.0.8.1... Building mono-traversable-1.0.8.1... Installed aeson-1.4.0.0 Configuring semigroupoids-5.3.1... Building semigroupoids-5.3.1... Installed mono-traversable-1.0.8.1 Configuring profunctors-5.3... Building profunctors-5.3... Installed semigroupoids-5.3.1 Configuring http-api-data-0.3.8.1... Building http-api-data-0.3.8.1... Installed profunctors-5.3 Configuring mutable-containers-0.3.4... Building mutable-containers-0.3.4... Installed http-api-data-0.3.8.1 Configuring free-5.0.2... Building free-5.0.2... Installed mutable-containers-0.3.4 Installed free-5.0.2 Configuring keys-3.12... Configuring adjunctions-4.4... Building adjunctions-4.4... Building keys-3.12... Installed adjunctions-4.4 Configuring kan-extensions-5.1... Installed keys-3.12 Building kan-extensions-5.1... Installed kan-extensions-5.1 Configuring pointed-5.0.1... Configuring lens-4.16.1... Building pointed-5.0.1... Building lens-4.16.1... Installed pointed-5.0.1 Configuring vector-instances-3.4... Building vector-instances-3.4... Installed vector-instances-3.4 Configuring mono-traversable-instances-0.1.0.0... Building mono-traversable-instances-0.1.0.0... Installed mono-traversable-instances-0.1.0.0 Configuring classy-prelude-1.4.0... Building classy-prelude-1.4.0... Installed classy-prelude-1.4.0 Installed lens-4.16.1 Configuring rfc-prelude-0.0.0.2... Building rfc-prelude-0.0.0.2... Failed to install rfc-prelude-0.0.0.2 Build log ( /home/builder/.cabal/logs/ghc-8.4.3/rfc-prelude-0.0.0.2-7bJCMqfik9w5XWRqGNZ5CM.log ): cabal: Entering directory '/tmp/cabal-tmp-3253/rfc-prelude-0.0.0.2' Configuring rfc-prelude-0.0.0.2... Preprocessing library for rfc-prelude-0.0.0.2.. Building library for rfc-prelude-0.0.0.2.. [1 of 8] Compiling Paths_rfc_prelude ( dist/build/autogen/Paths_rfc_prelude.hs, dist/build/Paths_rfc_prelude.o ) [2 of 8] Compiling RFC.Prelude.Concurrent ( src/RFC/Prelude/Concurrent.hs, dist/build/RFC/Prelude/Concurrent.o ) src/RFC/Prelude/Concurrent.hs:38:1: error: [-Wredundant-constraints, -Werror=redundant-constraints] • Redundant constraint: Semigroup (t a) • In the type signature for: filterConcurrently :: forall (t :: * -> *) a (m :: * -> *). (Traversable t, Applicative t, Semigroup (t a), Monoid (t a), MonadUnliftIO m) => (a -> Bool) -> t (m a) -> m (t a) | 38 | filterConcurrently :: (Traversable t, Applicative t, Semigroup (t a), Monoid (t a), MonadUnliftIO m) => (a -> Bool) -> t (m a) -> m (t a) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [3 of 8] Compiling RFC.Prelude.Instances ( src/RFC/Prelude/Instances.hs, dist/build/RFC/Prelude/Instances.o ) [4 of 8] Compiling RFC.Prelude.String ( src/RFC/Prelude/String.hs, dist/build/RFC/Prelude/String.o ) [5 of 8] Compiling RFC.Prelude.JSON ( src/RFC/Prelude/JSON.hs, dist/build/RFC/Prelude/JSON.o ) [6 of 8] Compiling RFC.Data.UUID ( src/RFC/Data/UUID.hs, dist/build/RFC/Data/UUID.o ) cabal: Leaving directory '/tmp/cabal-tmp-3253/rfc-prelude-0.0.0.2' cabal: Error: some packages failed to install: rfc-prelude-0.0.0.2-7bJCMqfik9w5XWRqGNZ5CM failed during the building phase. The exception was: ExitFailure 1