The build is unreachable.
Build log
> /tmp/stackage-build2452$ stack unpack validity-0.8.0.0@sha256:3712b48461dc58f0e1aecb7ae016c6702299a875282bb7b51e75eca2a65e8b69
Unpacked validity-0.8.0.0 to /tmp/stackage-build2452/validity-0.8.0.0/
> /tmp/stackage-build2452/validity-0.8.0.0$ 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/validity-0.8.0.0$ ./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/validity-0.8.0.0 --htmldir=/home/circleci/project/builds/nightly/doc/validity-0.8.0.0 --haddockdir=/home/circleci/project/builds/nightly/doc/validity-0.8.0.0
Configuring validity-0.8.0.0...
> /tmp/stackage-build2452/validity-0.8.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/validity-0.8.0.0$ ./Setup build
Preprocessing library for validity-0.8.0.0..
Building library for validity-0.8.0.0..
[1 of 3] Compiling Data.RelativeValidity ( src/Data/RelativeValidity.hs, dist/build/Data/RelativeValidity.o )
[2 of 3] Compiling Data.Validity ( src/Data/Validity.hs, dist/build/Data/Validity.o )
[3 of 3] Compiling Paths_validity ( dist/build/autogen/Paths_validity.hs, dist/build/Paths_validity.o )
> /tmp/stackage-build2452/validity-0.8.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/validity-0.8.0.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181113/validity-0.8.0.0-FYkVcAbbkbHKOiPgpaZwr7
> /tmp/stackage-build2452/validity-0.8.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/validity-0.8.0.0$ ./Setup register
Registering library for validity-0.8.0.0..