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...
Warning: The following packages are likely to be broken by the reinstalls:
parsec-3.1.13.0
Cabal-2.4.0.1
libiserv-8.6.1
ghci-8.6.1
ghc-8.6.1
ghc-boot-8.6.1
Continuing even though the plan contains dangerous reinstalls.
Starting     bv-0.5
Starting     containers-0.5.11.0
Building     bv-0.5
Building     containers-0.5.11.0
Completed    bv-0.5
Starting     primitive-0.6.4.0
Building     primitive-0.6.4.0
Completed    primitive-0.6.4.0
Starting     vector-0.12.0.2
Building     vector-0.12.0.2
Completed    containers-0.5.11.0
Starting     multiset-0.3.4.1
Building     multiset-0.3.4.1
Completed    multiset-0.3.4.1
Starting     binary-0.8.6.0
Building     binary-0.8.6.0
Completed    vector-0.12.0.2
Completed    binary-0.8.6.0
Starting     text-1.2.3.1
Building     text-1.2.3.1
Completed    text-1.2.3.1
Starting     funcons-values-0.1.0.5
Building     funcons-values-0.1.0.5
Completed    funcons-values-0.1.0.5