The build is unreachable.

Build log

> /tmp/stackage-build2455$ stack unpack hourglass-0.2.12@sha256:e083f5e030dfebe432e30a9c0fa07a99a54eac992f622442646be561fd7a44e8
Unpacked hourglass-0.2.12 to /tmp/stackage-build2455/hourglass-0.2.12/
> /tmp/stackage-build2455/hourglass-0.2.12$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
[1 of 1] Compiling Main             ( Setup.hs, Setup.o )
Linking Setup ...
> /tmp/stackage-build2455/hourglass-0.2.12$ ./Setup configure --package-db=clear --package-db=global --package-db=/home/circleci/project/builds/nightly/pkgdb --libdir=/home/circleci/project/builds/nightly/lib --bindir=/home/circleci/project/builds/nightly/bin --datadir=/home/circleci/project/builds/nightly/share --libexecdir=/home/circleci/project/builds/nightly/libexec --sysconfdir=/home/circleci/project/builds/nightly/etc --docdir=/home/circleci/project/builds/nightly/doc/hourglass-0.2.12 --htmldir=/home/circleci/project/builds/nightly/doc/hourglass-0.2.12 --haddockdir=/home/circleci/project/builds/nightly/doc/hourglass-0.2.12
Configuring hourglass-0.2.12...
> /tmp/stackage-build2455/hourglass-0.2.12$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2455/hourglass-0.2.12$ ./Setup build
Preprocessing library for hourglass-0.2.12..
Building library for hourglass-0.2.12..
[ 1 of 17] Compiling Data.Hourglass.Utils ( Data/Hourglass/Utils.hs, dist/build/Data/Hourglass/Utils.o )
[ 2 of 17] Compiling Data.Hourglass.Zone ( Data/Hourglass/Zone.hs, dist/build/Data/Hourglass/Zone.o )
[ 3 of 17] Compiling Time.Types       ( Time/Types.hs, dist/build/Time/Types.o )
[ 4 of 17] Compiling Data.Hourglass.Types ( Data/Hourglass/Types.hs, dist/build/Data/Hourglass/Types.o )
[ 5 of 17] Compiling Data.Hourglass.Internal.Unix ( Data/Hourglass/Internal/Unix.hs, dist/build/Data/Hourglass/Internal/Unix.o )

Data/Hourglass/Internal/Unix.hs:24:1: warning: [-Wunused-imports]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()
   |
24 | import Control.Applicative
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[ 6 of 17] Compiling Data.Hourglass.Internal ( Data/Hourglass/Internal.hs, dist/build/Data/Hourglass/Internal.o )
[ 7 of 17] Compiling Data.Hourglass.Calendar ( Data/Hourglass/Calendar.hs, dist/build/Data/Hourglass/Calendar.o )
[ 8 of 17] Compiling Data.Hourglass.Diff ( Data/Hourglass/Diff.hs, dist/build/Data/Hourglass/Diff.o )

Data/Hourglass/Diff.hs:23:1: warning: [-Wunused-imports]
    The import of ‘Data.Monoid’ is redundant
      except perhaps to import instances from ‘Data.Monoid’
    To import instances alone, use: import Data.Monoid()
   |
23 | import Data.Monoid
   | ^^^^^^^^^^^^^^^^^^
[ 9 of 17] Compiling Data.Hourglass.Time ( Data/Hourglass/Time.hs, dist/build/Data/Hourglass/Time.o )
[10 of 17] Compiling Data.Hourglass.Epoch ( Data/Hourglass/Epoch.hs, dist/build/Data/Hourglass/Epoch.o )
[11 of 17] Compiling Data.Hourglass.Local ( Data/Hourglass/Local.hs, dist/build/Data/Hourglass/Local.o )
[12 of 17] Compiling Time.System      ( Time/System.hs, dist/build/Time/System.o )

Time/System.hs:23:1: warning: [-Wunused-imports]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()
   |
23 | import Control.Applicative
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[13 of 17] Compiling System.Hourglass ( System/Hourglass.hs, dist/build/System/Hourglass.o )
[14 of 17] Compiling Data.Hourglass.Format ( Data/Hourglass/Format.hs, dist/build/Data/Hourglass/Format.o )
[15 of 17] Compiling Data.Hourglass   ( Data/Hourglass.hs, dist/build/Data/Hourglass.o )
[16 of 17] Compiling Time.Compat      ( Time/Compat.hs, dist/build/Time/Compat.o )
[17 of 17] Compiling Data.Hourglass.Compat ( Data/Hourglass/Compat.hs, dist/build/Data/Hourglass/Compat.o )
> /tmp/stackage-build2455/hourglass-0.2.12$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2455/hourglass-0.2.12$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181122/hourglass-0.2.12-333qxqQQ3eK9Jo0nKcpgW5
> /tmp/stackage-build2455/hourglass-0.2.12$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2455/hourglass-0.2.12$ ./Setup register
Registering library for hourglass-0.2.12..