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     cabal-doctest-1.0.8
Starting     call-stack-0.2.0
Starting     dual-0.1.1.1
Starting     base-orphans-0.8.1
Building     dual-0.1.1.1
Building     call-stack-0.2.0
Building     cabal-doctest-1.0.8
Building     base-orphans-0.8.1
Completed    call-stack-0.2.0
Starting     primitive-0.7.0.0
Completed    base-orphans-0.8.1
Starting     tagged-0.8.6
Completed    dual-0.1.1.1
Starting     util-0.1.17.0
Building     primitive-0.7.0.0
Building     tagged-0.8.6
Building     util-0.1.17.0
Completed    cabal-doctest-1.0.8
Completed    util-0.1.17.0
Starting     foldable1-0.1.0.0
Completed    tagged-0.8.6
Starting     hs-functors-0.1.6.0
Building     foldable1-0.1.0.0
Building     hs-functors-0.1.6.0
Completed    foldable1-0.1.0.0
Completed    hs-functors-0.1.6.0
Completed    primitive-0.7.0.0
Starting     vector-0.12.0.3
Building     vector-0.12.0.3
Completed    vector-0.12.0.3
Starting     lens-core-0.1.0.2
Building     lens-core-0.1.0.2
Failed to install lens-core-0.1.0.2
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/lens-core-0.1.0.2-qSqlRlD8kf4pmXMmlj1Sf.log ):
cabal: Entering directory '/tmp/cabal-tmp-23500/lens-core-0.1.0.2'
[1 of 1] Compiling Main             ( /tmp/cabal-tmp-23500/lens-core-0.1.0.2/dist/setup/setup.hs, /tmp/cabal-tmp-23500/lens-core-0.1.0.2/dist/setup/Main.o )
Linking /tmp/cabal-tmp-23500/lens-core-0.1.0.2/dist/setup/setup ...
Configuring lens-core-0.1.0.2...
Preprocessing library for lens-core-0.1.0.2..
Building library for lens-core-0.1.0.2..
[ 1 of 56] Compiling Control.Lens.Internal.CTypes ( src/Control/Lens/Internal/CTypes.hs, dist/build/Control/Lens/Internal/CTypes.o )
[ 2 of 56] Compiling Control.Lens.Internal.Coerce ( src/Control/Lens/Internal/Coerce.hs, dist/build/Control/Lens/Internal/Coerce.o )
[ 3 of 56] Compiling Control.Lens.Internal.Instances ( src/Control/Lens/Internal/Instances.hs, dist/build/Control/Lens/Internal/Instances.o )
[ 4 of 56] Compiling Control.Lens.Internal.Iso ( src/Control/Lens/Internal/Iso.hs, dist/build/Control/Lens/Internal/Iso.o )
[ 5 of 56] Compiling Control.Lens.Internal.Level ( src/Control/Lens/Internal/Level.hs, dist/build/Control/Lens/Internal/Level.o )
[ 6 of 56] Compiling Control.Lens.Internal.List ( src/Control/Lens/Internal/List.hs, dist/build/Control/Lens/Internal/List.o )
[ 7 of 56] Compiling Control.Lens.Internal.Prelude ( src/Control/Lens/Internal/Prelude.hs, dist/build/Control/Lens/Internal/Prelude.o )
[ 8 of 56] Compiling Control.Lens.Internal.Prism ( src/Control/Lens/Internal/Prism.hs, dist/build/Control/Lens/Internal/Prism.o )
[ 9 of 56] Compiling Control.Lens.Internal.Review ( src/Control/Lens/Internal/Review.hs, dist/build/Control/Lens/Internal/Review.o )
[10 of 56] Compiling Control.Lens.Internal.Setter ( src/Control/Lens/Internal/Setter.hs, dist/build/Control/Lens/Internal/Setter.o )

src/Control/Lens/Internal/Setter.hs:29:1: error:
    Could not find module ‘Data.Profunctor.Unsafe’
    Use -v to see a list of the files searched for.
   |
29 | import Data.Profunctor.Unsafe
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-23500/lens-core-0.1.0.2'
cabal: Error: some packages failed to install:
lens-core-0.1.0.2-qSqlRlD8kf4pmXMmlj1Sf failed during the building phase. The
exception was:
ExitFailure 1