The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack zeromq4-patterns-0.3.1.0@sha256:7e555a4bf36f5d44a474993c295ea7adbf7e81b9d37c9e1e80a222340a1df24d
Unpacked zeromq4-patterns-0.3.1.0 to /tmp/stackage-build2451/zeromq4-patterns-0.3.1.0/
> /tmp/stackage-build2451/zeromq4-patterns-0.3.1.0$ 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-build2451/zeromq4-patterns-0.3.1.0$ ./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/zeromq4-patterns-0.3.1.0 --htmldir=/home/circleci/project/builds/nightly/doc/zeromq4-patterns-0.3.1.0 --haddockdir=/home/circleci/project/builds/nightly/doc/zeromq4-patterns-0.3.1.0
Configuring zeromq4-patterns-0.3.1.0...
> /tmp/stackage-build2451/zeromq4-patterns-0.3.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/zeromq4-patterns-0.3.1.0$ ./Setup build
Preprocessing library for zeromq4-patterns-0.3.1.0..
Building library for zeromq4-patterns-0.3.1.0..
[1 of 3] Compiling System.ZMQ4.Patterns.Clone.Internal ( src/System/ZMQ4/Patterns/Clone/Internal.hs, dist/build/System/ZMQ4/Patterns/Clone/Internal.o )
[2 of 3] Compiling System.ZMQ4.Patterns.Clone ( src/System/ZMQ4/Patterns/Clone.hs, dist/build/System/ZMQ4/Patterns/Clone.o )
[3 of 3] Compiling System.ZMQ4.Patterns.RequestReply ( src/System/ZMQ4/Patterns/RequestReply.hs, dist/build/System/ZMQ4/Patterns/RequestReply.o )
Preprocessing executable 'zeromq4-patterns-exe' for zeromq4-patterns-0.3.1.0..
Building executable 'zeromq4-patterns-exe' for zeromq4-patterns-0.3.1.0..
[1 of 1] Compiling Main             ( example/Main.hs, dist/build/zeromq4-patterns-exe/zeromq4-patterns-exe-tmp/Main.o )
Linking dist/build/zeromq4-patterns-exe/zeromq4-patterns-exe ...
> /tmp/stackage-build2451/zeromq4-patterns-0.3.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/zeromq4-patterns-0.3.1.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181114/zeromq4-patterns-0.3.1.0-DDy4WpBUlhj5iwdZlUffBc
Installing executable zeromq4-patterns-exe in /home/circleci/project/builds/nightly/bin
> /tmp/stackage-build2451/zeromq4-patterns-0.3.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/zeromq4-patterns-0.3.1.0$ ./Setup register
Registering library for zeromq4-patterns-0.3.1.0..