Warning: The install command is a part of the legacy v1 style of cabal usage. Please switch to using either the new project style and the new-install command or the legacy v1-install alias as new-style projects will become the default in the next version of cabal-install. Please file a bug if you cannot replicate a working v1- use case with the new-style commands. For more information, see: https://wiki.haskell.org/Cabal/NewBuild Resolving dependencies... Starting base-orphans-0.8.1 Starting cabal-doctest-1.0.6 Starting StateVar-1.1.1.1 Starting basement-0.0.10 Building StateVar-1.1.1.1 Building cabal-doctest-1.0.6 Building base-orphans-0.8.1 Building basement-0.0.10 Completed base-orphans-0.8.1 Starting call-stack-0.1.0 Completed StateVar-1.1.1.1 Starting cereal-0.5.8.0 Building call-stack-0.1.0 Building cereal-0.5.8.0 Completed cabal-doctest-1.0.6 Starting data-default-class-0.1.2.0 Building data-default-class-0.1.2.0 Completed call-stack-0.1.0 Starting hashable-1.2.7.0 Building hashable-1.2.7.0 Completed data-default-class-0.1.2.0 Starting hourglass-0.2.12 Building hourglass-0.2.12 Completed hashable-1.2.7.0 Starting lens-family-core-1.2.3 Building lens-family-core-1.2.3 Completed cereal-0.5.8.0 Starting network-2.8.0.0 Completed lens-family-core-1.2.3 Starting network-byte-order-0.0.0.0 Building network-byte-order-0.0.0.0 Building network-2.8.0.0 Completed hourglass-0.2.12 Starting parallel-3.2.2.0 Building parallel-3.2.2.0 Completed network-byte-order-0.0.0.0 Starting primitive-0.6.4.0 Building primitive-0.6.4.0 Completed parallel-3.2.2.0 Starting reflection-2.1.4 Building reflection-2.1.4 Completed network-2.8.0.0 Starting semigroups-0.18.5 Completed reflection-2.1.4 Starting tagged-0.8.6 Building semigroups-0.18.5 Building tagged-0.8.6 Completed semigroups-0.18.5 Starting th-abstraction-0.2.11.0 Building th-abstraction-0.2.11.0 Completed tagged-0.8.6 Starting transformers-compat-0.6.3 Building transformers-compat-0.6.3 Failed to install transformers-compat-0.6.3 Build log ( /home/builder/.cabal/logs/ghc-8.6.3/transformers-compat-0.6.3-8J5sQDqjcykKMT9EWJuWmO.log ): cabal: Entering directory '/tmp/cabal-tmp-32280/transformers-compat-0.6.3' Configuring transformers-compat-0.6.3... Preprocessing library for transformers-compat-0.6.3.. Building library for transformers-compat-0.6.3.. [1 of 4] Compiling Control.Monad.Trans.Instances ( src/Control/Monad/Trans/Instances.hs, dist/build/Control/Monad/Trans/Instances.o ) src/Control/Monad/Trans/Instances.hs:610:10: error: Duplicate instance declarations: instance MonadFix m => MonadFix (ListT m) -- Defined at src/Control/Monad/Trans/Instances.hs:610:10 instance [safe] MonadFix m => MonadFix (ListT m) -- Defined in ‘Control.Monad.Trans.List’ | 610 | instance (MonadFix m) => MonadFix (ListT m) where | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cabal: Leaving directory '/tmp/cabal-tmp-32280/transformers-compat-0.6.3' Starting void-0.7.2 Building void-0.7.2 Completed primitive-0.6.4.0 Completed void-0.7.2 Completed th-abstraction-0.2.11.0 Completed basement-0.0.10 cabal: Error: some packages failed to install: adjunctions-4.4-6rIsiWE8kPfDWVrMJBk2NV depends on adjunctions-4.4 which failed to install. bifunctors-5.5.3-7ypOJJuRiyTIXXC5seKRKh depends on bifunctors-5.5.3 which failed to install. comonad-5.0.4-1PGHt9eYrA4BrPWH2Q760 depends on comonad-5.0.4 which failed to install. exceptions-0.10.1-LJQK6tPYLpA2GwdrZBxobP depends on exceptions-0.10.1 which failed to install. free-5.1-8MYGFPJMLDiJWGdGHtY1Yr depends on free-5.1 which failed to install. http2-client-grpc-0.6.0.0-DnaaSW2ggpOAHJUqWylKga depends on http2-client-grpc-0.6.0.0 which failed to install. http2-grpc-types-0.4.0.0-2I6rEGWltnI2c32ct4CFH4 depends on http2-grpc-types-0.4.0.0 which failed to install. invariant-0.5.1-CMQOtbM31qhAXyTA28AUKR depends on invariant-0.5.1 which failed to install. kan-extensions-5.2-F6jGBnlZ9ZZ6ZmOBLugUoK depends on kan-extensions-5.2 which failed to install. lens-4.17-IEsks0FDkfnFTCwXbnyzD2 depends on lens-4.17 which failed to install. profunctors-5.3-qXv5dUOfqq1f96GD3xAOm depends on profunctors-5.3 which failed to install. proto-lens-0.5.0.0-84lUHCFw3WiDvcjhHd4qBM depends on proto-lens-0.5.0.0 which failed to install. semigroupoids-5.3.2-8Ihc6E5I5xqH8eYcekW9rO depends on semigroupoids-5.3.2 which failed to install. transformers-base-0.4.5.2-GlJ8ZErq7lWLBZaohbo02f depends on transformers-base-0.4.5.2 which failed to install. transformers-compat-0.6.3-8J5sQDqjcykKMT9EWJuWmO failed during the building phase. The exception was: ExitFailure 1