The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack base64-bytestring-1.0.0.1@sha256:40e088e357790fe3709ff7b9dd18d79b866e2936b13ade184bc9355315fb3ab5
Unpacked base64-bytestring-1.0.0.1 to /tmp/stackage-build2451/base64-bytestring-1.0.0.1/
> /tmp/stackage-build2451/base64-bytestring-1.0.0.1$ 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-build2451/base64-bytestring-1.0.0.1$ ./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/base64-bytestring-1.0.0.1 --htmldir=/home/circleci/project/builds/nightly/doc/base64-bytestring-1.0.0.1 --haddockdir=/home/circleci/project/builds/nightly/doc/base64-bytestring-1.0.0.1
Configuring base64-bytestring-1.0.0.1...
> /tmp/stackage-build2451/base64-bytestring-1.0.0.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/base64-bytestring-1.0.0.1$ ./Setup build
Preprocessing library for base64-bytestring-1.0.0.1..
Building library for base64-bytestring-1.0.0.1..
[1 of 5] Compiling Data.ByteString.Base64.Internal ( Data/ByteString/Base64/Internal.hs, dist/build/Data/ByteString/Base64/Internal.o )
[2 of 5] Compiling Data.ByteString.Base64 ( Data/ByteString/Base64.hs, dist/build/Data/ByteString/Base64.o )
[3 of 5] Compiling Data.ByteString.Base64.Lazy ( Data/ByteString/Base64/Lazy.hs, dist/build/Data/ByteString/Base64/Lazy.o )
[4 of 5] Compiling Data.ByteString.Base64.URL ( Data/ByteString/Base64/URL.hs, dist/build/Data/ByteString/Base64/URL.o )
[5 of 5] Compiling Data.ByteString.Base64.URL.Lazy ( Data/ByteString/Base64/URL/Lazy.hs, dist/build/Data/ByteString/Base64/URL/Lazy.o )
> /tmp/stackage-build2451/base64-bytestring-1.0.0.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/base64-bytestring-1.0.0.1$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/base64-bytestring-1.0.0.1-G3Br32Wzx6yIe8CvhfIHtS
> /tmp/stackage-build2451/base64-bytestring-1.0.0.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/base64-bytestring-1.0.0.1$ ./Setup register
Registering library for base64-bytestring-1.0.0.1..