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     StateVar-1.1.1.1
Starting     cabal-doctest-1.0.6
Starting     hashable-1.2.7.0
Starting     base-orphans-0.8.1
Building     StateVar-1.1.1.1
Building     hashable-1.2.7.0
Building     base-orphans-0.8.1
Building     cabal-doctest-1.0.6
Completed    base-orphans-0.8.1
Starting     mtl-compat-0.2.1.3
Completed    StateVar-1.1.1.1
Starting     primitive-0.6.4.0
Building     mtl-compat-0.2.1.3
Building     primitive-0.6.4.0
Completed    mtl-compat-0.2.1.3
Starting     semigroups-0.18.5
Completed    cabal-doctest-1.0.6
Starting     tagged-0.8.6
Building     semigroups-0.18.5
Building     tagged-0.8.6
Completed    hashable-1.2.7.0
Starting     th-abstraction-0.2.11.0
Building     th-abstraction-0.2.11.0
Completed    semigroups-0.18.5
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-30654/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-30654/transformers-compat-0.6.3'
Starting     unliftio-core-0.1.2.0
Building     unliftio-core-0.1.2.0
Completed    tagged-0.8.6
Completed    unliftio-core-0.1.2.0
Completed    th-abstraction-0.2.11.0
Completed    primitive-0.6.4.0
cabal: Error: some packages 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.
protolude-0.2.3-9uUu2FmGClOGb0l8menM4l depends on protolude-0.2.3 which failed
to install.
registry-0.1.3.1-K47YP2qyNyq9EnskzFpczq depends on registry-0.1.3.1 which
failed to install.
resourcet-1.2.2-6SDTFhVwwqh77JL7liyTkt depends on resourcet-1.2.2 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