The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack io-region-0.1.1@sha256:685ef338e4a3e356bb96eef98dedd0a3d06c7edd75cc4351e25a63e6fe795660
Unpacked io-region-0.1.1 to /tmp/stackage-build2451/io-region-0.1.1/
> /tmp/stackage-build2451/io-region-0.1.1$ 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-build2451/io-region-0.1.1$ ./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/io-region-0.1.1 --htmldir=/home/circleci/project/builds/nightly/doc/io-region-0.1.1 --haddockdir=/home/circleci/project/builds/nightly/doc/io-region-0.1.1
Configuring io-region-0.1.1...
> /tmp/stackage-build2451/io-region-0.1.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/io-region-0.1.1$ ./Setup build
Preprocessing library for io-region-0.1.1..
Building library for io-region-0.1.1..
[1 of 1] Compiling Control.IO.Region ( lib/Control/IO/Region.hs, dist/build/Control/IO/Region.o )
> /tmp/stackage-build2451/io-region-0.1.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/io-region-0.1.1$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181121/io-region-0.1.1-FSKN1KZ7FGO53wfjNRBcsq
> /tmp/stackage-build2451/io-region-0.1.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/io-region-0.1.1$ ./Setup register
Registering library for io-region-0.1.1..