The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack intro-0.5.1.0@sha256:2cedf49405271004fbff591b72365cf907675afd2a596dea4ecb2d381112784b
Unpacked intro-0.5.1.0 to /tmp/stackage-build2452/intro-0.5.1.0/
> /tmp/stackage-build2452/intro-0.5.1.0$ 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/intro-0.5.1.0$ ./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/intro-0.5.1.0 --htmldir=/home/circleci/project/builds/nightly/doc/intro-0.5.1.0 --haddockdir=/home/circleci/project/builds/nightly/doc/intro-0.5.1.0
Configuring intro-0.5.1.0...
> /tmp/stackage-build2452/intro-0.5.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/intro-0.5.1.0$ ./Setup build
Preprocessing library for intro-0.5.1.0..
Building library for intro-0.5.1.0..
[1 of 4] Compiling Intro.ConvertString ( src/Intro/ConvertString.hs, dist/build/Intro/ConvertString.o )
[2 of 4] Compiling Intro.Trustworthy ( src/Intro/Trustworthy.hs, dist/build/Intro/Trustworthy.o )
[3 of 4] Compiling Intro            ( src/Intro.hs, dist/build/Intro.o )
[4 of 4] Compiling Paths_intro      ( dist/build/autogen/Paths_intro.hs, dist/build/Paths_intro.o )
> /tmp/stackage-build2452/intro-0.5.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/intro-0.5.1.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181122/intro-0.5.1.0-JxG2zpNHrMl7q46d3HDOfW
> /tmp/stackage-build2452/intro-0.5.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/intro-0.5.1.0$ ./Setup register
Registering library for intro-0.5.1.0..