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...
Warning: The following packages are likely to be broken by the reinstalls:
parsec-3.1.13.0
Cabal-2.4.0.1
Continuing even though the plan contains dangerous reinstalls.
Starting     cabal-doctest-1.0.8
Starting     random-1.1
Starting     hashable-1.3.0.0
Starting     base-orphans-0.8.2
Building     hashable-1.3.0.0
Building     random-1.1
Building     cabal-doctest-1.0.8
Building     base-orphans-0.8.2
Completed    cabal-doctest-1.0.8
Starting     th-abstraction-0.3.2.0
Building     th-abstraction-0.3.2.0
Completed    random-1.1
Starting     transformers-0.5.6.2
Completed    hashable-1.3.0.0
Starting     unordered-containers-0.2.10.0
Building     transformers-0.5.6.2
Building     unordered-containers-0.2.10.0
Completed    base-orphans-0.8.2
Completed    th-abstraction-0.3.2.0
Completed    unordered-containers-0.2.10.0
Completed    transformers-0.5.6.2
Starting     tagged-0.8.6
Starting     mtl-2.2.2
Starting     transformers-compat-0.6.5
Starting     primitive-0.7.0.1
Building     tagged-0.8.6
Building     mtl-2.2.2
Building     transformers-compat-0.6.5
Building     primitive-0.7.0.1
Completed    tagged-0.8.6
Starting     StateVar-1.2
Completed    transformers-compat-0.6.5
Starting     distributive-0.6.1
Building     StateVar-1.2
Completed    mtl-2.2.2
Completed    StateVar-1.2
Starting     contravariant-1.5.2
Building     distributive-0.6.1
Building     contravariant-1.5.2
Completed    distributive-0.6.1
Starting     comonad-5.0.6
Completed    contravariant-1.5.2
Building     comonad-5.0.6
Completed    primitive-0.7.0.1
Starting     MonadRandom-0.5.1.2
Building     MonadRandom-0.5.1.2
Completed    comonad-5.0.6
Starting     bifunctors-5.5.7
Building     bifunctors-5.5.7
Completed    MonadRandom-0.5.1.2
Completed    bifunctors-5.5.7
Starting     profunctors-5.5.2
Building     profunctors-5.5.2
Completed    profunctors-5.5.2
Starting     invariant-0.5.3
Building     invariant-0.5.3
Completed    invariant-0.5.3
Starting     monad-choice-0.1.0.0
Building     monad-choice-0.1.0.0
Completed    monad-choice-0.1.0.0