The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack Diff-0.3.4@sha256:5ab20a407f9e65d13b642c3cd414906a40280343a31b388f6ed69b9228fe42c1
Unpacked Diff-0.3.4 to /tmp/stackage-build2452/Diff-0.3.4/
> /tmp/stackage-build2452/Diff-0.3.4$ 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/Diff-0.3.4$ ./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/Diff-0.3.4 --htmldir=/home/circleci/project/builds/nightly/doc/Diff-0.3.4 --haddockdir=/home/circleci/project/builds/nightly/doc/Diff-0.3.4
Configuring Diff-0.3.4...
> /tmp/stackage-build2452/Diff-0.3.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/Diff-0.3.4$ ./Setup build
Preprocessing library for Diff-0.3.4..
Building library for Diff-0.3.4..
[1 of 3] Compiling Data.Algorithm.Diff ( src/Data/Algorithm/Diff.hs, dist/build/Data/Algorithm/Diff.o )
[2 of 3] Compiling Data.Algorithm.DiffContext ( src/Data/Algorithm/DiffContext.hs, dist/build/Data/Algorithm/DiffContext.o )
[3 of 3] Compiling Data.Algorithm.DiffOutput ( src/Data/Algorithm/DiffOutput.hs, dist/build/Data/Algorithm/DiffOutput.o )
> /tmp/stackage-build2452/Diff-0.3.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/Diff-0.3.4$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181122/Diff-0.3.4-Isdcu3XDRoL1Fkaeabn3wS
> /tmp/stackage-build2452/Diff-0.3.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/Diff-0.3.4$ ./Setup register
Registering library for Diff-0.3.4..