The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack free-vl-0.1.4@sha256:150ba489128fe05a830fe3aad3771e134222a9b7327dc43676ef70b3cc99219c
Unpacked free-vl-0.1.4 to /tmp/stackage-build2451/free-vl-0.1.4/
> /tmp/stackage-build2451/free-vl-0.1.4$ 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/free-vl-0.1.4$ ./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/free-vl-0.1.4 --htmldir=/home/circleci/project/builds/nightly/doc/free-vl-0.1.4 --haddockdir=/home/circleci/project/builds/nightly/doc/free-vl-0.1.4
Configuring free-vl-0.1.4...
> /tmp/stackage-build2451/free-vl-0.1.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/free-vl-0.1.4$ ./Setup build
Preprocessing library for free-vl-0.1.4..
Building library for free-vl-0.1.4..
[1 of 2] Compiling Control.Monad.Free.VanLaarhoven ( src/Control/Monad/Free/VanLaarhoven.hs, dist/build/Control/Monad/Free/VanLaarhoven.o )
[2 of 2] Compiling Control.Monad.Free.VanLaarhovenE ( src/Control/Monad/Free/VanLaarhovenE.hs, dist/build/Control/Monad/Free/VanLaarhovenE.o )
Preprocessing executable 'examples' for free-vl-0.1.4..
Building executable 'examples' for free-vl-0.1.4..
[1 of 1] Compiling Main             ( examples/Main.hs, dist/build/examples/examples-tmp/Main.o )
Linking dist/build/examples/examples ...
> /tmp/stackage-build2451/free-vl-0.1.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/free-vl-0.1.4$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181121/free-vl-0.1.4-8wXH1uh0sDlG9twHsGDXt1
Installing executable examples in /home/circleci/project/builds/nightly/bin
> /tmp/stackage-build2451/free-vl-0.1.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/free-vl-0.1.4$ ./Setup register
Registering library for free-vl-0.1.4..