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     torsor-0.1
Starting     semigroups-0.19
Building     torsor-0.1
Building     semigroups-0.19
Completed    semigroups-0.19
Completed    torsor-0.1
Downloading  ditto-0.4
Downloaded   ditto-0.4
Starting     ditto-0.4
Building     ditto-0.4
Completed    ditto-0.4