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     dependent-sum-0.5
Starting     mtl-compat-0.2.2
Starting     th-abstraction-0.3.1.0
Starting     hashable-1.2.7.0
Building     dependent-sum-0.5
Building     mtl-compat-0.2.2
Building     th-abstraction-0.3.1.0
Building     hashable-1.2.7.0
Completed    mtl-compat-0.2.2
Starting     transformers-compat-0.6.5
Building     transformers-compat-0.6.5
Completed    dependent-sum-0.5
Starting     dependent-map-0.2.4.0
Building     dependent-map-0.2.4.0
Completed    hashable-1.2.7.0
Starting     async-2.2.2
Completed    transformers-compat-0.6.5
Building     async-2.2.2
Completed    th-abstraction-0.3.1.0
Starting     deriving-compat-0.5.6
Building     deriving-compat-0.5.6
Completed    dependent-map-0.2.4.0
Completed    async-2.2.2
Starting     protolude-0.2.3
Building     protolude-0.2.3
Completed    deriving-compat-0.5.6
Completed    protolude-0.2.3
Downloading  rock-0.1.0.1
Downloaded   rock-0.1.0.1
Starting     rock-0.1.0.1
Building     rock-0.1.0.1
Completed    rock-0.1.0.1