The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack throwable-exceptions-0.1.0.9@sha256:7f7bc7792dc0de7a2ddc4c2ddc72973557a203c3ef5addc7f651e7d7c8efc161
Unpacked throwable-exceptions-0.1.0.9 to /tmp/stackage-build2452/throwable-exceptions-0.1.0.9/
> /tmp/stackage-build2452/throwable-exceptions-0.1.0.9$ 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/throwable-exceptions-0.1.0.9$ ./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/throwable-exceptions-0.1.0.9 --htmldir=/home/circleci/project/builds/nightly/doc/throwable-exceptions-0.1.0.9 --haddockdir=/home/circleci/project/builds/nightly/doc/throwable-exceptions-0.1.0.9
Configuring throwable-exceptions-0.1.0.9...
> /tmp/stackage-build2452/throwable-exceptions-0.1.0.9$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/throwable-exceptions-0.1.0.9$ ./Setup build
Preprocessing library for throwable-exceptions-0.1.0.9..
Building library for throwable-exceptions-0.1.0.9..
[1 of 2] Compiling Control.Exception.Throwable.TH ( src/Control/Exception/Throwable/TH.hs, dist/build/Control/Exception/Throwable/TH.o )
[2 of 2] Compiling Control.Exception.Throwable ( src/Control/Exception/Throwable.hs, dist/build/Control/Exception/Throwable.o )
> /tmp/stackage-build2452/throwable-exceptions-0.1.0.9$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/throwable-exceptions-0.1.0.9$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/throwable-exceptions-0.1.0.9-FLIJvkgsfg65vIMxuFTSKX
> /tmp/stackage-build2452/throwable-exceptions-0.1.0.9$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/throwable-exceptions-0.1.0.9$ ./Setup register
Registering library for throwable-exceptions-0.1.0.9..