The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack hsemail-2@sha256:ab62a6ada93768c4efcfb8aadde465de18e0420dbb84a94cc3027ae6085b68c6
Unpacked hsemail-2 to /tmp/stackage-build2452/hsemail-2/
> /tmp/stackage-build2452/hsemail-2$ 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-build2452/hsemail-2$ ./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/hsemail-2 --htmldir=/home/circleci/project/builds/nightly/doc/hsemail-2 --haddockdir=/home/circleci/project/builds/nightly/doc/hsemail-2
Configuring hsemail-2...
> /tmp/stackage-build2452/hsemail-2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/hsemail-2$ ./Setup build
Preprocessing library for hsemail-2..
Building library for hsemail-2..
[1 of 4] Compiling Paths_hsemail    ( dist/build/autogen/Paths_hsemail.hs, dist/build/Paths_hsemail.o )
[2 of 4] Compiling Text.Parsec.Rfc2234 ( src/Text/Parsec/Rfc2234.hs, dist/build/Text/Parsec/Rfc2234.o )
[3 of 4] Compiling Text.Parsec.Rfc2821 ( src/Text/Parsec/Rfc2821.hs, dist/build/Text/Parsec/Rfc2821.o )
[4 of 4] Compiling Text.Parsec.Rfc2822 ( src/Text/Parsec/Rfc2822.hs, dist/build/Text/Parsec/Rfc2822.o )
> /tmp/stackage-build2452/hsemail-2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/hsemail-2$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181113/hsemail-2-LbJPgoCbg709xzuIsEMD1Q
> /tmp/stackage-build2452/hsemail-2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/hsemail-2$ ./Setup register
Registering library for hsemail-2..