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     hashable-1.3.0.0
Starting     random-1.1
Starting     primitive-0.7.0.0
Building     random-1.1
Building     hashable-1.3.0.0
Building     primitive-0.7.0.0
Completed    random-1.1
Completed    hashable-1.3.0.0
Starting     async-2.2.2
Building     async-2.2.2
Completed    async-2.2.2
Completed    primitive-0.7.0.0
Starting     atomic-primops-0.8.3
Starting     vector-0.12.0.3
Building     atomic-primops-0.8.3
Building     vector-0.12.0.3
Completed    atomic-primops-0.8.3
Completed    vector-0.12.0.3
Downloading  concurrent-hashtable-0.1.8
Downloaded   concurrent-hashtable-0.1.8
Starting     concurrent-hashtable-0.1.8
Building     concurrent-hashtable-0.1.8
Completed    concurrent-hashtable-0.1.8