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     ref-tf-0.4.0.2
Starting     hashable-1.3.0.0
Starting     primitive-0.7.0.0
Building     ref-tf-0.4.0.2
Building     hashable-1.3.0.0
Building     primitive-0.7.0.0
Completed    ref-tf-0.4.0.2
Completed    hashable-1.3.0.0
Completed    primitive-0.7.0.0
Downloading  monad-primitive-0.1
Starting     vector-0.12.0.3
Downloaded   monad-primitive-0.1
Starting     monad-primitive-0.1
Building     vector-0.12.0.3
Building     monad-primitive-0.1
Completed    monad-primitive-0.1
Completed    vector-0.12.0.3
Downloading  haggle-0.1.0.0
Downloaded   haggle-0.1.0.0
Starting     haggle-0.1.0.0
Building     haggle-0.1.0.0
Completed    haggle-0.1.0.0