The build is unreachable.

Build log

> /tmp/stackage-build2454$ stack unpack nanospec-0.2.2@sha256:a3311128515b687817baa485d1f50c6d6444c76620a8ac91919de142de69bf49
Unpacked nanospec-0.2.2 to /tmp/stackage-build2454/nanospec-0.2.2/
> /tmp/stackage-build2454/nanospec-0.2.2$ 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-build2454/nanospec-0.2.2$ ./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/nanospec-0.2.2 --htmldir=/home/circleci/project/builds/nightly/doc/nanospec-0.2.2 --haddockdir=/home/circleci/project/builds/nightly/doc/nanospec-0.2.2
Configuring nanospec-0.2.2...
> /tmp/stackage-build2454/nanospec-0.2.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/nanospec-0.2.2$ ./Setup build
Preprocessing library for nanospec-0.2.2..
Building library for nanospec-0.2.2..
[1 of 2] Compiling Paths_nanospec   ( dist/build/autogen/Paths_nanospec.hs, dist/build/Paths_nanospec.o )
[2 of 2] Compiling Test.Hspec       ( src/Test/Hspec.hs, dist/build/Test/Hspec.o )
> /tmp/stackage-build2454/nanospec-0.2.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/nanospec-0.2.2$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181116/nanospec-0.2.2-KcjeuWL9U51IHarDtI7Xvd
> /tmp/stackage-build2454/nanospec-0.2.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/nanospec-0.2.2$ ./Setup register
Registering library for nanospec-0.2.2..
> /tmp/stackage-build2454/nanospec-0.2.2$ ghc-pkg --no-user-package-db --package-db=/home/circleci/project/builds/nightly/pkgdb hide nanospec-0.2.2