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-1.2
Starting     cabal-doctest-1.0.8
Starting     base-orphans-0.8.2
Starting     hashable-1.3.0.0
Building     StateVar-1.2
Building     cabal-doctest-1.0.8
Building     base-orphans-0.8.2
Building     hashable-1.3.0.0
Completed    StateVar-1.2
Starting     mtl-2.2.1
Building     mtl-2.2.1
Completed    cabal-doctest-1.0.8
Starting     tagged-0.8.6
Building     tagged-0.8.6
Completed    hashable-1.3.0.0
Starting     th-abstraction-0.3.2.0
Completed    base-orphans-0.8.2
Starting     transformers-compat-0.6.5
Building     th-abstraction-0.3.2.0
Building     transformers-compat-0.6.5
Completed    mtl-2.2.1
Starting     contravariant-1.5.2
Completed    tagged-0.8.6
Starting     unordered-containers-0.2.10.0
Building     contravariant-1.5.2
Building     unordered-containers-0.2.10.0
Completed    transformers-compat-0.6.5
Starting     distributive-0.6.2
Completed    th-abstraction-0.3.2.0
Completed    contravariant-1.5.2
Building     distributive-0.6.2
Completed    distributive-0.6.2
Starting     comonad-5.0.6
Building     comonad-5.0.6
Completed    unordered-containers-0.2.10.0
Completed    comonad-5.0.6
Starting     bifunctors-5.5.7
Building     bifunctors-5.5.7
Completed    bifunctors-5.5.7
Starting     semigroupoids-5.3.4
Starting     profunctors-5.5.2
Building     profunctors-5.5.2
Building     semigroupoids-5.3.4
Completed    profunctors-5.5.2
Completed    semigroupoids-5.3.4
Starting     either-5.0.1.1
Building     either-5.0.1.1
Completed    either-5.0.1.1
Starting     oref-0.0.3
Building     oref-0.0.3
Failed to install oref-0.0.3
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/oref-0.0.3-GMy2aMe8ush696p90vh3lO.log ):
cabal: Entering directory '/tmp/cabal-tmp-30354/oref-0.0.3'
Configuring oref-0.0.3...
Preprocessing library for oref-0.0.3..
Building library for oref-0.0.3..
[1 of 3] Compiling Data.ORef.Internal ( src/Data/ORef/Internal.hs, dist/build/Data/ORef/Internal.o )

src/Data/ORef/Internal.hs:34:1: error:
    Could not find module ‘Control.Monad.Trans.Either’
    Perhaps you meant
      Control.Monad.Trans.Writer (from transformers-0.5.5.0)
      Control.Monad.Trans.Error (from transformers-0.5.5.0)
      Control.Monad.Trans.Reader (from transformers-0.5.5.0)
    Use -v to see a list of the files searched for.
   |
34 | import Control.Monad.Trans.Either
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-30354/oref-0.0.3'
cabal: Error: some packages failed to install:
oref-0.0.3-GMy2aMe8ush696p90vh3lO failed during the building phase. The
exception was:
ExitFailure 1