The build is unreachable.

Build log

> /tmp/stackage-build2454$ stack unpack compiler-warnings-0.1.0@sha256:cf32066a119fcfdd029e28b77c6da1d8bc7ba18d0c8e94a73d74da789b963c75
Unpacked compiler-warnings-0.1.0 to /tmp/stackage-build2454/compiler-warnings-0.1.0/
> /tmp/stackage-build2454/compiler-warnings-0.1.0$ 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-build2454/compiler-warnings-0.1.0$ ./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/compiler-warnings-0.1.0 --htmldir=/home/circleci/project/builds/nightly/doc/compiler-warnings-0.1.0 --haddockdir=/home/circleci/project/builds/nightly/doc/compiler-warnings-0.1.0
Configuring compiler-warnings-0.1.0...
> /tmp/stackage-build2454/compiler-warnings-0.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/compiler-warnings-0.1.0$ ./Setup build
Preprocessing library for compiler-warnings-0.1.0..
Building library for compiler-warnings-0.1.0..
[1 of 2] Compiling Paths_compiler_warnings ( dist/build/autogen/Paths_compiler_warnings.hs, dist/build/Paths_compiler_warnings.o )
[2 of 2] Compiling Text.Warning     ( src/Text/Warning.hs, dist/build/Text/Warning.o )

src/Text/Warning.hs:11:1-18: warning: [-Wunused-imports]
    The import of ‘Data.Monoid’ is redundant
      except perhaps to import instances from ‘Data.Monoid’
    To import instances alone, use: import Data.Monoid()
   |
11 | import Data.Monoid
   | ^^^^^^^^^^^^^^^^^^
> /tmp/stackage-build2454/compiler-warnings-0.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/compiler-warnings-0.1.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181117/compiler-warnings-0.1.0-3z1YwUra3b71BwLYFgovmP
> /tmp/stackage-build2454/compiler-warnings-0.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/compiler-warnings-0.1.0$ ./Setup register
Registering library for compiler-warnings-0.1.0..