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     semigroups-0.19
Starting     tagged-0.8.6
Starting     cabal-doctest-1.0.6
Building     base-orphans-0.8.1
Building     semigroups-0.19
Building     tagged-0.8.6
Building     cabal-doctest-1.0.6
Completed    semigroups-0.19
Starting     th-abstraction-0.3.1.0
Completed    base-orphans-0.8.1
Starting     transformers-compat-0.6.5
Building     th-abstraction-0.3.1.0
Building     transformers-compat-0.6.5
Completed    cabal-doctest-1.0.6
Completed    tagged-0.8.6
Starting     distributive-0.6
Completed    transformers-compat-0.6.5
Building     distributive-0.6
Completed    th-abstraction-0.3.1.0
Completed    distributive-0.6
Starting     comonad-5.0.5
Building     comonad-5.0.5
Completed    comonad-5.0.5
Starting     bifunctors-5.5.4
Building     bifunctors-5.5.4
Completed    bifunctors-5.5.4
Downloading  ditto-0.0.1.1
Downloaded   ditto-0.0.1.1
Starting     ditto-0.0.1.1
Building     ditto-0.0.1.1
Completed    ditto-0.0.1.1