The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack pqueue-1.4.1.2@sha256:5409f92bb55df02a965c10008683b8c7337d9229e152b7b0e3de88af6ba8659d
Unpacked pqueue-1.4.1.2 to /tmp/stackage-build2451/pqueue-1.4.1.2/
> /tmp/stackage-build2451/pqueue-1.4.1.2$ 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/pqueue-1.4.1.2$ ./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/pqueue-1.4.1.2 --htmldir=/home/circleci/project/builds/nightly/doc/pqueue-1.4.1.2 --haddockdir=/home/circleci/project/builds/nightly/doc/pqueue-1.4.1.2
Configuring pqueue-1.4.1.2...
> /tmp/stackage-build2451/pqueue-1.4.1.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/pqueue-1.4.1.2$ ./Setup build
Preprocessing library for pqueue-1.4.1.2..
Building library for pqueue-1.4.1.2..
[1 of 8] Compiling Control.Applicative.Identity ( Control/Applicative/Identity.hs, dist/build/Control/Applicative/Identity.o )
[2 of 8] Compiling Data.PQueue.Prio.Internals ( Data/PQueue/Prio/Internals.hs, dist/build/Data/PQueue/Prio/Internals.o )
[3 of 8] Compiling Data.PQueue.Internals ( Data/PQueue/Internals.hs, dist/build/Data/PQueue/Internals.o )
[4 of 8] Compiling Data.PQueue.Min  ( Data/PQueue/Min.hs, dist/build/Data/PQueue/Min.o )
[5 of 8] Compiling Data.PQueue.Prio.Max.Internals ( Data/PQueue/Prio/Max/Internals.hs, dist/build/Data/PQueue/Prio/Max/Internals.o )
[6 of 8] Compiling Data.PQueue.Max  ( Data/PQueue/Max.hs, dist/build/Data/PQueue/Max.o )
[7 of 8] Compiling Data.PQueue.Prio.Min ( Data/PQueue/Prio/Min.hs, dist/build/Data/PQueue/Prio/Min.o )
[8 of 8] Compiling Data.PQueue.Prio.Max ( Data/PQueue/Prio/Max.hs, dist/build/Data/PQueue/Prio/Max.o )
> /tmp/stackage-build2451/pqueue-1.4.1.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/pqueue-1.4.1.2$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/pqueue-1.4.1.2-L2KGTnUJN6Y67Kc3f9nCti
> /tmp/stackage-build2451/pqueue-1.4.1.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/pqueue-1.4.1.2$ ./Setup register
Registering library for pqueue-1.4.1.2..