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     dlist-0.8.0.5
Starting     hashable-1.2.7.0
Starting     primitive-0.6.4.0
Building     dlist-0.8.0.5
Building     hashable-1.2.7.0
Building     primitive-0.6.4.0
Completed    dlist-0.8.0.5
Completed    hashable-1.2.7.0
Starting     case-insensitive-1.2.0.11
Building     case-insensitive-1.2.0.11
Completed    case-insensitive-1.2.0.11
Completed    primitive-0.6.4.0
Starting     vector-0.12.0.2
Building     vector-0.12.0.2
Completed    vector-0.12.0.2
Downloading  qrcode-core-0.9.0
Downloaded   qrcode-core-0.9.0
Starting     qrcode-core-0.9.0
Building     qrcode-core-0.9.0
Completed    qrcode-core-0.9.0