The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack hopfli-0.2.2.1@sha256:6a4abed1bf041c875cb66a0c53c63826dff13902a35f1e7b5a3a941a8bb6d284
Unpacked hopfli-0.2.2.1 to /tmp/stackage-build2451/hopfli-0.2.2.1/
> /tmp/stackage-build2451/hopfli-0.2.2.1$ 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/hopfli-0.2.2.1$ ./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/hopfli-0.2.2.1 --htmldir=/home/circleci/project/builds/nightly/doc/hopfli-0.2.2.1 --haddockdir=/home/circleci/project/builds/nightly/doc/hopfli-0.2.2.1
Configuring hopfli-0.2.2.1...
> /tmp/stackage-build2451/hopfli-0.2.2.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/hopfli-0.2.2.1$ ./Setup build
Preprocessing library for hopfli-0.2.2.1..
Building library for hopfli-0.2.2.1..
[1 of 2] Compiling Codec.Compression.Hopfli.Raw ( dist/build/Codec/Compression/Hopfli/Raw.hs, dist/build/Codec/Compression/Hopfli/Raw.o )
[2 of 2] Compiling Codec.Compression.Hopfli ( src/Codec/Compression/Hopfli.hs, dist/build/Codec/Compression/Hopfli.o )
> /tmp/stackage-build2451/hopfli-0.2.2.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/hopfli-0.2.2.1$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181121/hopfli-0.2.2.1-7nV1rl9QSwI2WxAXVFPDQq
> /tmp/stackage-build2451/hopfli-0.2.2.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/hopfli-0.2.2.1$ ./Setup register
Registering library for hopfli-0.2.2.1..