The build is unreachable.

Build log

> /tmp/stackage-build2455$ stack unpack IntervalMap-0.6.0.0@sha256:b90aed59df7ef6be858009944014bdb3a19ca7237ecb3721ca76b6aa9288f5b6
Unpacked IntervalMap-0.6.0.0 to /tmp/stackage-build2455/IntervalMap-0.6.0.0/
> /tmp/stackage-build2455/IntervalMap-0.6.0.0$ 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-build2455/IntervalMap-0.6.0.0$ ./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/IntervalMap-0.6.0.0 --htmldir=/home/circleci/project/builds/nightly/doc/IntervalMap-0.6.0.0 --haddockdir=/home/circleci/project/builds/nightly/doc/IntervalMap-0.6.0.0
Configuring IntervalMap-0.6.0.0...
> /tmp/stackage-build2455/IntervalMap-0.6.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2455/IntervalMap-0.6.0.0$ ./Setup build
Preprocessing library for IntervalMap-0.6.0.0..
Building library for IntervalMap-0.6.0.0..
[1 of 9] Compiling Data.IntervalMap.Interval ( Data/IntervalMap/Interval.hs, dist/build/Data/IntervalMap/Interval.o )
[2 of 9] Compiling Data.IntervalMap.Generic.Interval ( Data/IntervalMap/Generic/Interval.hs, dist/build/Data/IntervalMap/Generic/Interval.o )
[3 of 9] Compiling Data.IntervalMap.Generic.Base ( Data/IntervalMap/Generic/Base.hs, dist/build/Data/IntervalMap/Generic/Base.o )
[4 of 9] Compiling Data.IntervalMap.Generic.Strict ( Data/IntervalMap/Generic/Strict.hs, dist/build/Data/IntervalMap/Generic/Strict.o )
[5 of 9] Compiling Data.IntervalMap.Generic.Lazy ( Data/IntervalMap/Generic/Lazy.hs, dist/build/Data/IntervalMap/Generic/Lazy.o )
[6 of 9] Compiling Data.IntervalMap.Lazy ( Data/IntervalMap/Lazy.hs, dist/build/Data/IntervalMap/Lazy.o )
[7 of 9] Compiling Data.IntervalMap.Strict ( Data/IntervalMap/Strict.hs, dist/build/Data/IntervalMap/Strict.o )
[8 of 9] Compiling Data.IntervalMap ( Data/IntervalMap.hs, dist/build/Data/IntervalMap.o )
[9 of 9] Compiling Data.IntervalSet ( Data/IntervalSet.hs, dist/build/Data/IntervalSet.o )
> /tmp/stackage-build2455/IntervalMap-0.6.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2455/IntervalMap-0.6.0.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181122/IntervalMap-0.6.0.0-GL9SjWgr116D76vDGChA6o
> /tmp/stackage-build2455/IntervalMap-0.6.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2455/IntervalMap-0.6.0.0$ ./Setup register
Registering library for IntervalMap-0.6.0.0..