The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack exceptions-0.10.0@sha256:ef6066c13de2dfd191dc810f9dfa9a474318abc9bb458413ffbdd2ece482312a
Unpacked exceptions-0.10.0 to /tmp/stackage-build2452/exceptions-0.10.0/
> /tmp/stackage-build2452/exceptions-0.10.0$ 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-build2452/exceptions-0.10.0$ ./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/exceptions-0.10.0 --htmldir=/home/circleci/project/builds/nightly/doc/exceptions-0.10.0 --haddockdir=/home/circleci/project/builds/nightly/doc/exceptions-0.10.0
Configuring exceptions-0.10.0...
> /tmp/stackage-build2452/exceptions-0.10.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/exceptions-0.10.0$ ./Setup build
Preprocessing library for exceptions-0.10.0..
Building library for exceptions-0.10.0..
[1 of 2] Compiling Control.Monad.Catch ( src/Control/Monad/Catch.hs, dist/build/Control/Monad/Catch.o )
[2 of 2] Compiling Control.Monad.Catch.Pure ( src/Control/Monad/Catch/Pure.hs, dist/build/Control/Monad/Catch/Pure.o )
> /tmp/stackage-build2452/exceptions-0.10.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/exceptions-0.10.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/exceptions-0.10.0-JqzQdRRDTnhFJo0seRLeVq
> /tmp/stackage-build2452/exceptions-0.10.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/exceptions-0.10.0$ ./Setup register
Registering library for exceptions-0.10.0..