The build is unreachable.

Build log

> /tmp/stackage-build2454$ stack unpack markdown-unlit-0.5.0@sha256:42e8052f6c497b200f6819c54bcd113fa5e0ed9a539408eacfbeaf3685b99b07
Unpacked markdown-unlit-0.5.0 to /tmp/stackage-build2454/markdown-unlit-0.5.0/
> /tmp/stackage-build2454/markdown-unlit-0.5.0$ 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-build2454/markdown-unlit-0.5.0$ ./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/markdown-unlit-0.5.0 --htmldir=/home/circleci/project/builds/nightly/doc/markdown-unlit-0.5.0 --haddockdir=/home/circleci/project/builds/nightly/doc/markdown-unlit-0.5.0
Configuring markdown-unlit-0.5.0...
> /tmp/stackage-build2454/markdown-unlit-0.5.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/markdown-unlit-0.5.0$ ./Setup build
Preprocessing library for markdown-unlit-0.5.0..
Building library for markdown-unlit-0.5.0..
[1 of 2] Compiling Paths_markdown_unlit ( dist/build/autogen/Paths_markdown_unlit.hs, dist/build/Paths_markdown_unlit.o )
[2 of 2] Compiling Text.Markdown.Unlit ( src/Text/Markdown/Unlit.hs, dist/build/Text/Markdown/Unlit.o )
Preprocessing executable 'markdown-unlit' for markdown-unlit-0.5.0..
Building executable 'markdown-unlit' for markdown-unlit-0.5.0..
[1 of 2] Compiling Main             ( driver/Main.hs, dist/build/markdown-unlit/markdown-unlit-tmp/Main.o )
[2 of 2] Compiling Paths_markdown_unlit ( dist/build/markdown-unlit/autogen/Paths_markdown_unlit.hs, dist/build/markdown-unlit/markdown-unlit-tmp/Paths_markdown_unlit.o )
Linking dist/build/markdown-unlit/markdown-unlit ...
> /tmp/stackage-build2454/markdown-unlit-0.5.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/markdown-unlit-0.5.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181117/markdown-unlit-0.5.0-6fRANjCTasj2oKVsSYXjvB
Installing executable markdown-unlit in /home/circleci/project/builds/nightly/bin
> /tmp/stackage-build2454/markdown-unlit-0.5.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/markdown-unlit-0.5.0$ ./Setup register
Registering library for markdown-unlit-0.5.0..