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 auto-update-0.1.4.1 Starting cabal-doctest-1.0.6 Starting base-orphans-0.8.1 Starting base-compat-0.10.5 Building auto-update-0.1.4.1 Building cabal-doctest-1.0.6 Building base-orphans-0.8.1 Building base-compat-0.10.5 Completed base-orphans-0.8.1 Starting clock-0.7.2 Completed auto-update-0.1.4.1 Starting data-default-class-0.1.2.0 Building clock-0.7.2 Building data-default-class-0.1.2.0 Completed cabal-doctest-1.0.6 Starting dlist-0.8.0.6 Building dlist-0.8.0.6 Completed data-default-class-0.1.2.0 Starting easy-file-0.2.2 Completed clock-0.7.2 Starting hashable-1.2.7.0 Building easy-file-0.2.2 Building hashable-1.2.7.0 Completed dlist-0.8.0.6 Starting integer-logarithms-1.0.2.2 Completed base-compat-0.10.5 Starting monad-loops-0.4.3 Building integer-logarithms-1.0.2.2 Building monad-loops-0.4.3 Completed easy-file-0.2.2 Starting mtl-compat-0.2.1.3 Building mtl-compat-0.2.1.3 Completed mtl-compat-0.2.1.3 Starting network-3.0.1.1 Completed integer-logarithms-1.0.2.2 Starting old-locale-1.0.0.7 Completed hashable-1.2.7.0 Starting primitive-0.6.4.0 Completed monad-loops-0.4.3 Starting random-1.1 Building old-locale-1.0.0.7 Building primitive-0.6.4.0 Building random-1.1 Completed old-locale-1.0.0.7 Starting semigroups-0.18.5 Building semigroups-0.18.5 Building network-3.0.1.1 Completed semigroups-0.18.5 Starting split-0.2.3.3 Building split-0.2.3.3 Completed random-1.1 Starting stm-chans-3.0.0.4 Completed split-0.2.3.3 Starting tagged-0.8.6 Building tagged-0.8.6 Building stm-chans-3.0.0.4 Completed stm-chans-3.0.0.4 Starting th-abstraction-0.2.11.0 Completed tagged-0.8.6 Starting time-locale-compat-0.1.1.5 Building th-abstraction-0.2.11.0 Building time-locale-compat-0.1.1.5 Completed network-3.0.1.1 Starting transformers-compat-0.6.3 Completed time-locale-compat-0.1.1.5 Starting unix-compat-0.5.1 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-24914/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-24914/transformers-compat-0.6.3' Starting unliftio-core-0.1.2.0 Building unix-compat-0.5.1 Building unliftio-core-0.1.2.0 Completed primitive-0.6.4.0 Completed unliftio-core-0.1.2.0 Completed unix-compat-0.5.1 Completed th-abstraction-0.2.11.0 cabal: Error: some packages failed to install: conduit-1.3.1.1-BqJ4MznSKgh5HEnNxzQPxI depends on conduit-1.3.1.1 which failed to install. conduit-extra-1.3.1.1-JGPAahoKAHCGhrjAx0mnB0 depends on conduit-extra-1.3.1.1 which failed to install. exceptions-0.10.1-LJQK6tPYLpA2GwdrZBxobP depends on exceptions-0.10.1 which failed to install. lifted-base-0.2.3.12-7DC58dW6Ssi4Wn1ISrqI1y depends on lifted-base-0.2.3.12 which failed to install. monad-control-1.0.2.3-8BHBbAYBTFTA2W3hiaPuHm depends on monad-control-1.0.2.3 which failed to install. monad-logger-0.3.30-7s7HdqWdoVC7bceBfwkTUl depends on monad-logger-0.3.30 which failed to install. protolude-0.2.3-9uUu2FmGClOGb0l8menM4l depends on protolude-0.2.3 which failed to install. resourcet-1.2.2-6SDTFhVwwqh77JL7liyTkt depends on resourcet-1.2.2 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 webby-0.1.0.1-3oO9942MXU057rbAEUeN1F depends on webby-0.1.0.1 which failed to install.