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     ghc-lib-parser-0.20190523
Building     ghc-lib-parser-0.20190523
Completed    ghc-lib-parser-0.20190523
Downloading  ghc-lib-0.20190523.1
Downloaded   ghc-lib-0.20190523.1
Starting     ghc-lib-0.20190523.1
Building     ghc-lib-0.20190523.1
Completed    ghc-lib-0.20190523.1