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     semigroups-0.19.1
Starting     base-prelude-1.3
Starting     tuple-th-0.2.5
Building     base-prelude-1.3
Building     StateVar-1.2
Building     semigroups-0.19.1
Building     tuple-th-0.2.5
Completed    semigroups-0.19.1
Completed    StateVar-1.2
Starting     contravariant-1.5.2
Building     contravariant-1.5.2
Completed    tuple-th-0.2.5
Completed    contravariant-1.5.2
Completed    base-prelude-1.3
Downloading  contravariant-extras-0.3.5
Downloaded   contravariant-extras-0.3.5
Starting     contravariant-extras-0.3.5
Building     contravariant-extras-0.3.5
Completed    contravariant-extras-0.3.5