The build is unreachable.

Build log

> /tmp/stackage-build2456$ stack unpack mysql-0.1.5@sha256:ba2f123f14017d2b626eb49b91d55248714a319d9f85539cc4a1f883b4cf2e5a
Unpacked mysql-0.1.5 to /tmp/stackage-build2456/mysql-0.1.5/
> /tmp/stackage-build2456/mysql-0.1.5$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb -hide-all-packages -package=Cabal -package=base Setup
[1 of 1] Compiling Main             ( Setup.hs, Setup.o )
Linking Setup ...
> /tmp/stackage-build2456/mysql-0.1.5$ ./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/mysql-0.1.5 --htmldir=/home/circleci/project/builds/nightly/doc/mysql-0.1.5 --haddockdir=/home/circleci/project/builds/nightly/doc/mysql-0.1.5
Configuring mysql-0.1.5...
> /tmp/stackage-build2456/mysql-0.1.5$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb -hide-all-packages -package=Cabal -package=base Setup
> /tmp/stackage-build2456/mysql-0.1.5$ ./Setup build
Preprocessing library for mysql-0.1.5..
Building library for mysql-0.1.5..
[1 of 3] Compiling Database.MySQL.Base.Types ( dist/build/Database/MySQL/Base/Types.hs, dist/build/Database/MySQL/Base/Types.o )
[2 of 3] Compiling Database.MySQL.Base.C ( dist/build/Database/MySQL/Base/C.hs, dist/build/Database/MySQL/Base/C.o )
[3 of 3] Compiling Database.MySQL.Base ( Database/MySQL/Base.hs, dist/build/Database/MySQL/Base.o )
> /tmp/stackage-build2456/mysql-0.1.5$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb -hide-all-packages -package=Cabal -package=base Setup
> /tmp/stackage-build2456/mysql-0.1.5$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181116/mysql-0.1.5-6leQFb5FmVqHCGtMIBszpO
> /tmp/stackage-build2456/mysql-0.1.5$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb -hide-all-packages -package=Cabal -package=base Setup
> /tmp/stackage-build2456/mysql-0.1.5$ ./Setup register
Registering library for mysql-0.1.5..