The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack thread-hierarchy-0.3.0.0@sha256:96fb9d8d590a0a3d439cc1f87645692f1baadfa98fb79772c45f9b48f0d8fa94
Unpacked thread-hierarchy-0.3.0.0 to /tmp/stackage-build2451/thread-hierarchy-0.3.0.0/
> /tmp/stackage-build2451/thread-hierarchy-0.3.0.0$ 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-build2451/thread-hierarchy-0.3.0.0$ ./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/thread-hierarchy-0.3.0.0 --htmldir=/home/circleci/project/builds/nightly/doc/thread-hierarchy-0.3.0.0 --haddockdir=/home/circleci/project/builds/nightly/doc/thread-hierarchy-0.3.0.0
Configuring thread-hierarchy-0.3.0.0...
> /tmp/stackage-build2451/thread-hierarchy-0.3.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/thread-hierarchy-0.3.0.0$ ./Setup build
Preprocessing library for thread-hierarchy-0.3.0.0..
Building library for thread-hierarchy-0.3.0.0..
[1 of 2] Compiling Control.Concurrent.HierarchyInternal ( src/Control/Concurrent/HierarchyInternal.hs, dist/build/Control/Concurrent/HierarchyInternal.o )
[2 of 2] Compiling Control.Concurrent.Hierarchy ( src/Control/Concurrent/Hierarchy.hs, dist/build/Control/Concurrent/Hierarchy.o )
> /tmp/stackage-build2451/thread-hierarchy-0.3.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/thread-hierarchy-0.3.0.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181114/thread-hierarchy-0.3.0.0-C9bPA80Xb5gKTE9oHANKY2
> /tmp/stackage-build2451/thread-hierarchy-0.3.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/thread-hierarchy-0.3.0.0$ ./Setup register
Registering library for thread-hierarchy-0.3.0.0..