The build is unreachable.
Build log
> /tmp/stackage-build2453$ stack unpack hspec-discover-2.5.5@sha256:9fe08300140653ab0dfcf7892bac8eafc5a03980e41148c16fde374cf7cbd8fa
Unpacked hspec-discover-2.5.5 to /tmp/stackage-build2453/hspec-discover-2.5.5/
> /tmp/stackage-build2453/hspec-discover-2.5.5$ 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-build2453/hspec-discover-2.5.5$ ./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/hspec-discover-2.5.5 --htmldir=/home/circleci/project/builds/nightly/doc/hspec-discover-2.5.5 --haddockdir=/home/circleci/project/builds/nightly/doc/hspec-discover-2.5.5
Configuring hspec-discover-2.5.5...
> /tmp/stackage-build2453/hspec-discover-2.5.5$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2453/hspec-discover-2.5.5$ ./Setup build
Preprocessing library for hspec-discover-2.5.5..
Building library for hspec-discover-2.5.5..
[1 of 4] Compiling Paths_hspec_discover ( dist/build/autogen/Paths_hspec_discover.hs, dist/build/Paths_hspec_discover.o )
[2 of 4] Compiling Test.Hspec.Discover.Config ( src/Test/Hspec/Discover/Config.hs, dist/build/Test/Hspec/Discover/Config.o )
[3 of 4] Compiling Test.Hspec.Discover.Sort ( src/Test/Hspec/Discover/Sort.hs, dist/build/Test/Hspec/Discover/Sort.o )
[4 of 4] Compiling Test.Hspec.Discover.Run ( src/Test/Hspec/Discover/Run.hs, dist/build/Test/Hspec/Discover/Run.o )
Preprocessing executable 'hspec-discover' for hspec-discover-2.5.5..
Building executable 'hspec-discover' for hspec-discover-2.5.5..
[1 of 2] Compiling Main ( driver/hspec-discover.hs, dist/build/hspec-discover/hspec-discover-tmp/Main.o )
[2 of 2] Compiling Paths_hspec_discover ( dist/build/hspec-discover/autogen/Paths_hspec_discover.hs, dist/build/hspec-discover/hspec-discover-tmp/Paths_hspec_discover.o )
Linking dist/build/hspec-discover/hspec-discover ...
> /tmp/stackage-build2453/hspec-discover-2.5.5$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2453/hspec-discover-2.5.5$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181120/hspec-discover-2.5.5-7TaqxJchWWsLnwsHDgiemV
Installing executable hspec-discover in /home/circleci/project/builds/nightly/bin
> /tmp/stackage-build2453/hspec-discover-2.5.5$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2453/hspec-discover-2.5.5$ ./Setup register
Registering library for hspec-discover-2.5.5..