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     wl-pprint-1.2.1
Starting     hashable-1.3.0.0
Building     wl-pprint-1.2.1
Building     hashable-1.3.0.0
Completed    wl-pprint-1.2.1
Completed    hashable-1.3.0.0
Starting     unordered-containers-0.2.10.0
Building     unordered-containers-0.2.10.0
Completed    unordered-containers-0.2.10.0
Downloading  expresso-0.1.2.3
Downloaded   expresso-0.1.2.3
Starting     expresso-0.1.2.3
Building     expresso-0.1.2.3
Completed    expresso-0.1.2.3