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     extensible-exceptions-0.1.1.4
Starting     random-1.1
Building     random-1.1
Building     extensible-exceptions-0.1.1.4
Completed    extensible-exceptions-0.1.1.4
Completed    random-1.1
Starting     parallel-io-0.3.3
Building     parallel-io-0.3.3
Completed    parallel-io-0.3.3
Starting     par-traverse-0.2.0.0
Building     par-traverse-0.2.0.0
Completed    par-traverse-0.2.0.0