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     base-noprelude-4.12.0.0
Starting     primitive-0.6.4.0
Starting     hashable-1.2.7.0
Building     base-noprelude-4.12.0.0
Building     primitive-0.6.4.0
Building     hashable-1.2.7.0
Completed    base-noprelude-4.12.0.0
Completed    hashable-1.2.7.0
Starting     unordered-containers-0.2.10.0
Building     unordered-containers-0.2.10.0
Completed    primitive-0.6.4.0
Starting     vector-0.12.0.2
Building     vector-0.12.0.2
Completed    unordered-containers-0.2.10.0
Completed    vector-0.12.0.2
Starting     semirings-0.3.1.1
Building     semirings-0.3.1.1
Completed    semirings-0.3.1.1
Downloading  fib-0.1
Downloaded   fib-0.1
Starting     fib-0.1
Building     fib-0.1
Completed    fib-0.1