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     integer-logarithms-1.0.3
Starting     hashable-1.3.0.0
Starting     parser-combinators-1.2.1
Starting     primitive-0.7.0.1
Building     parser-combinators-1.2.1
Building     integer-logarithms-1.0.3
Building     hashable-1.3.0.0
Building     primitive-0.7.0.1
Completed    integer-logarithms-1.0.3
Starting     selective-0.4
Building     selective-0.4
Completed    parser-combinators-1.2.1
Completed    hashable-1.3.0.0
Starting     case-insensitive-1.2.1.0
Building     case-insensitive-1.2.1.0
Completed    selective-0.4
Completed    case-insensitive-1.2.1.0
Completed    primitive-0.7.0.1
Starting     scientific-0.3.6.2
Building     scientific-0.3.6.2
Completed    scientific-0.3.6.2
Starting     megaparsec-8.0.0
Building     megaparsec-8.0.0
Completed    megaparsec-8.0.0
Downloading  headed-megaparsec-0.1.0.3
Downloaded   headed-megaparsec-0.1.0.3
Starting     headed-megaparsec-0.1.0.3
Building     headed-megaparsec-0.1.0.3
Completed    headed-megaparsec-0.1.0.3