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     Diff-0.4.0
Starting     hashable-1.3.0.0
Starting     haskell-lexer-1.1
Starting     colour-2.3.5
Building     Diff-0.4.0
Building     haskell-lexer-1.1
Building     colour-2.3.5
Building     hashable-1.3.0.0
Completed    Diff-0.4.0
Starting     integer-logarithms-1.0.3
Building     integer-logarithms-1.0.3
Completed    hashable-1.3.0.0
Starting     primitive-0.7.0.1
Building     primitive-0.7.0.1
Completed    integer-logarithms-1.0.3
Starting     transformers-compat-0.6.5
Building     transformers-compat-0.6.5
Completed    colour-2.3.5
Starting     ansi-terminal-0.10.3
Building     ansi-terminal-0.10.3
Completed    transformers-compat-0.6.5
Completed    ansi-terminal-0.10.3
Starting     ansi-wl-pprint-0.6.9
Building     ansi-wl-pprint-0.6.9
Completed    ansi-wl-pprint-0.6.9
Starting     optparse-applicative-0.15.1.0
Building     optparse-applicative-0.15.1.0
Completed    primitive-0.7.0.1
Starting     scientific-0.3.6.2
Starting     vector-0.12.1.2
Building     scientific-0.3.6.2
Building     vector-0.12.1.2
Completed    scientific-0.3.6.2
Starting     attoparsec-0.13.2.4
Building     attoparsec-0.13.2.4
Completed    optparse-applicative-0.15.1.0
Completed    haskell-lexer-1.1
Starting     pretty-show-1.10
Building     pretty-show-1.10
Completed    attoparsec-0.13.2.4
Completed    pretty-show-1.10
Completed    vector-0.12.1.2
Starting     nix-derivation-1.1.0
Building     nix-derivation-1.1.0
Completed    nix-derivation-1.1.0
Starting     nix-diff-1.0.10
Building     nix-diff-1.0.10
Completed    nix-diff-1.0.10