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...
Downloading  STMonadTrans-0.4.3
Starting     fail-4.9.0.0
Starting     transformers-compat-0.6.2
Downloaded   STMonadTrans-0.4.3
Starting     STMonadTrans-0.4.3
Building     fail-4.9.0.0
Building     transformers-compat-0.6.2
Building     STMonadTrans-0.4.3
Completed    fail-4.9.0.0
Completed    STMonadTrans-0.4.3
Completed    transformers-compat-0.6.2
Downloading  equivalence-0.3.4
Downloaded   equivalence-0.3.4
Starting     equivalence-0.3.4
Building     equivalence-0.3.4
Completed    equivalence-0.3.4