The build is unreachable.

Build log

> /tmp/stackage-build2454$ stack unpack unliftio-0.2.8.1@sha256:8f87213ae2b255ab45aaf290644837a50d69337e273cc89afc5a32696b80a2ff
Unpacked unliftio-0.2.8.1 to /tmp/stackage-build2454/unliftio-0.2.8.1/
> /tmp/stackage-build2454/unliftio-0.2.8.1$ 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-build2454/unliftio-0.2.8.1$ ./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/unliftio-0.2.8.1 --htmldir=/home/circleci/project/builds/nightly/doc/unliftio-0.2.8.1 --haddockdir=/home/circleci/project/builds/nightly/doc/unliftio-0.2.8.1
Configuring unliftio-0.2.8.1...
> /tmp/stackage-build2454/unliftio-0.2.8.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/unliftio-0.2.8.1$ ./Setup build
Preprocessing library for unliftio-0.2.8.1..
Building library for unliftio-0.2.8.1..
[ 1 of 17] Compiling Paths_unliftio   ( dist/build/autogen/Paths_unliftio.hs, dist/build/Paths_unliftio.o )
[ 2 of 17] Compiling UnliftIO.Chan    ( src/UnliftIO/Chan.hs, dist/build/UnliftIO/Chan.o )
[ 3 of 17] Compiling UnliftIO.Directory ( src/UnliftIO/Directory.hs, dist/build/UnliftIO/Directory.o )
[ 4 of 17] Compiling UnliftIO.Environment ( src/UnliftIO/Environment.hs, dist/build/UnliftIO/Environment.o )
[ 5 of 17] Compiling UnliftIO.Exception ( src/UnliftIO/Exception.hs, dist/build/UnliftIO/Exception.o )
[ 6 of 17] Compiling UnliftIO.Async   ( src/UnliftIO/Async.hs, dist/build/UnliftIO/Async.o )
[ 7 of 17] Compiling UnliftIO.Foreign ( src/UnliftIO/Foreign.hs, dist/build/UnliftIO/Foreign.o )
[ 8 of 17] Compiling UnliftIO.IO      ( src/UnliftIO/IO.hs, dist/build/UnliftIO/IO.o )
[ 9 of 17] Compiling UnliftIO.IORef   ( src/UnliftIO/IORef.hs, dist/build/UnliftIO/IORef.o )
[10 of 17] Compiling UnliftIO.MVar    ( src/UnliftIO/MVar.hs, dist/build/UnliftIO/MVar.o )
[11 of 17] Compiling UnliftIO.Concurrent ( src/UnliftIO/Concurrent.hs, dist/build/UnliftIO/Concurrent.o )
[12 of 17] Compiling UnliftIO.Memoize ( src/UnliftIO/Memoize.hs, dist/build/UnliftIO/Memoize.o )
[13 of 17] Compiling UnliftIO.Process ( src/UnliftIO/Process.hs, dist/build/UnliftIO/Process.o )
[14 of 17] Compiling UnliftIO.STM     ( src/UnliftIO/STM.hs, dist/build/UnliftIO/STM.o )
[15 of 17] Compiling UnliftIO.Temporary ( src/UnliftIO/Temporary.hs, dist/build/UnliftIO/Temporary.o )
[16 of 17] Compiling UnliftIO.Timeout ( src/UnliftIO/Timeout.hs, dist/build/UnliftIO/Timeout.o )
[17 of 17] Compiling UnliftIO         ( src/UnliftIO.hs, dist/build/UnliftIO.o )
> /tmp/stackage-build2454/unliftio-0.2.8.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/unliftio-0.2.8.1$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181116/unliftio-0.2.8.1-AC39DOvZ4cLAqMUyS7gG8
> /tmp/stackage-build2454/unliftio-0.2.8.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/unliftio-0.2.8.1$ ./Setup register
Registering library for unliftio-0.2.8.1..