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     code-page-0.2
Starting     ghc-paths-0.1.0.12
Starting     syb-0.7.1
Starting     base-compat-0.10.5
Building     code-page-0.2
Building     syb-0.7.1
Building     base-compat-0.10.5
Completed    code-page-0.2
Building     ghc-paths-0.1.0.12
Completed    syb-0.7.1
Completed    ghc-paths-0.1.0.12
Completed    base-compat-0.10.5
Downloading  doctest-0.16.2
Downloaded   doctest-0.16.2
Starting     doctest-0.16.2
Building     doctest-0.16.2
Completed    doctest-0.16.2