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-1.2.7.0
Building     hashable-1.2.7.0
Completed    hashable-1.2.7.0
Starting     async-2.2.1
Building     async-2.2.1
Completed    async-2.2.1
Downloading  chan-0.0.4.1
Downloaded   chan-0.0.4.1
Starting     chan-0.0.4.1
Building     chan-0.0.4.1
Completed    chan-0.0.4.1