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     fail-4.9.0.0
Starting     extensible-exceptions-0.1.1.4
Building     fail-4.9.0.0
Building     extensible-exceptions-0.1.1.4
Completed    fail-4.9.0.0
Completed    extensible-exceptions-0.1.1.4
Starting     monad-peel-0.2.1.2
Building     monad-peel-0.2.1.2
Completed    monad-peel-0.2.1.2
Downloading  mstate-0.2.8
Downloaded   mstate-0.2.8
Starting     mstate-0.2.8
Building     mstate-0.2.8
Completed    mstate-0.2.8