The build is unreachable.

Build log

> /tmp/stackage-build2456$ stack unpack newtype-generics-0.5.3@sha256:1b3152921e4a8d8d0e635c30b82a8f4c4cd31d0e7063a81e06e81c4e03e696be
Unpacked newtype-generics-0.5.3 to /tmp/stackage-build2456/newtype-generics-0.5.3/
> /tmp/stackage-build2456/newtype-generics-0.5.3$ 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-build2456/newtype-generics-0.5.3$ ./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/newtype-generics-0.5.3 --htmldir=/home/circleci/project/builds/nightly/doc/newtype-generics-0.5.3 --haddockdir=/home/circleci/project/builds/nightly/doc/newtype-generics-0.5.3
Configuring newtype-generics-0.5.3...
> /tmp/stackage-build2456/newtype-generics-0.5.3$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/newtype-generics-0.5.3$ ./Setup build
Preprocessing library for newtype-generics-0.5.3..
Building library for newtype-generics-0.5.3..
[1 of 2] Compiling Control.Newtype.Generics ( Control/Newtype/Generics.hs, dist/build/Control/Newtype/Generics.o )
[2 of 2] Compiling Control.Newtype  ( Control/Newtype.hs, dist/build/Control/Newtype.o )
> /tmp/stackage-build2456/newtype-generics-0.5.3$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/newtype-generics-0.5.3$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181117/newtype-generics-0.5.3-FMiILXHH8yBATuJzNrYRPS
> /tmp/stackage-build2456/newtype-generics-0.5.3$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/newtype-generics-0.5.3$ ./Setup register
Registering library for newtype-generics-0.5.3..
> /tmp/stackage-build2456/newtype-generics-0.5.3$ ghc-pkg --no-user-package-db --package-db=/home/circleci/project/builds/nightly/pkgdb hide newtype-generics-0.5.3