The build is unreachable.
Build log
> /tmp/stackage-build2456$ stack unpack rainbow-0.30.0.2@sha256:a2a631a6e42313fbc509c2bf0610bb1f09925530de16cfa40b6f184a3a3a24d4
Unpacked rainbow-0.30.0.2 to /tmp/stackage-build2456/rainbow-0.30.0.2/
> /tmp/stackage-build2456/rainbow-0.30.0.2$ 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-build2456/rainbow-0.30.0.2$ ./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/rainbow-0.30.0.2 --htmldir=/home/circleci/project/builds/nightly/doc/rainbow-0.30.0.2 --haddockdir=/home/circleci/project/builds/nightly/doc/rainbow-0.30.0.2
Configuring rainbow-0.30.0.2...
> /tmp/stackage-build2456/rainbow-0.30.0.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/rainbow-0.30.0.2$ ./Setup build
Preprocessing library for rainbow-0.30.0.2..
Building library for rainbow-0.30.0.2..
[1 of 4] Compiling Paths_rainbow ( dist/build/autogen/Paths_rainbow.hs, dist/build/Paths_rainbow.o )
[2 of 4] Compiling Rainbow.Types ( lib/Rainbow/Types.hs, dist/build/Rainbow/Types.o )
[3 of 4] Compiling Rainbow.Translate ( lib/Rainbow/Translate.hs, dist/build/Rainbow/Translate.o )
[4 of 4] Compiling Rainbow ( lib/Rainbow.hs, dist/build/Rainbow.o )
> /tmp/stackage-build2456/rainbow-0.30.0.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/rainbow-0.30.0.2$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181116/rainbow-0.30.0.2-EH4L8tdfoNf5lJVlsqzNSO
> /tmp/stackage-build2456/rainbow-0.30.0.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/rainbow-0.30.0.2$ ./Setup register
Registering library for rainbow-0.30.0.2..