The build is unreachable.

Build log

> /tmp/stackage-build2453$ stack unpack intervals-0.8.1@sha256:f92803cfbe33b4a31a06156fd0cb5f50c37e3b6468b69f2c553fd01136c0a3e3
Unpacked intervals-0.8.1 to /tmp/stackage-build2453/intervals-0.8.1/
> /tmp/stackage-build2453/intervals-0.8.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb -hide-all-packages -package=Cabal -package=base -package=cabal-doctest Setup
[1 of 1] Compiling Main             ( Setup.lhs, Setup.o )
Linking Setup ...
> /tmp/stackage-build2453/intervals-0.8.1$ ./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/intervals-0.8.1 --htmldir=/home/circleci/project/builds/nightly/doc/intervals-0.8.1 --haddockdir=/home/circleci/project/builds/nightly/doc/intervals-0.8.1
Configuring intervals-0.8.1...
> /tmp/stackage-build2453/intervals-0.8.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb -hide-all-packages -package=Cabal -package=base -package=cabal-doctest Setup
> /tmp/stackage-build2453/intervals-0.8.1$ ./Setup build
Preprocessing library for intervals-0.8.1..
Building library for intervals-0.8.1..
[1 of 6] Compiling Numeric.Interval.Exception ( src/Numeric/Interval/Exception.hs, dist/build/Numeric/Interval/Exception.o )
[2 of 6] Compiling Numeric.Interval.Internal ( src/Numeric/Interval/Internal.hs, dist/build/Numeric/Interval/Internal.o )
[3 of 6] Compiling Numeric.Interval ( src/Numeric/Interval.hs, dist/build/Numeric/Interval.o )
[4 of 6] Compiling Numeric.Interval.Kaucher ( src/Numeric/Interval/Kaucher.hs, dist/build/Numeric/Interval/Kaucher.o )
[5 of 6] Compiling Numeric.Interval.NonEmpty.Internal ( src/Numeric/Interval/NonEmpty/Internal.hs, dist/build/Numeric/Interval/NonEmpty/Internal.o )

src/Numeric/Interval/NonEmpty/Internal.hs:63:1: warning: [-Wunused-imports]
    The import of ‘Numeric.Interval.Exception’ is redundant
      except perhaps to import instances from ‘Numeric.Interval.Exception’
    To import instances alone, use: import Numeric.Interval.Exception()
   |
63 | import Numeric.Interval.Exception
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[6 of 6] Compiling Numeric.Interval.NonEmpty ( src/Numeric/Interval/NonEmpty.hs, dist/build/Numeric/Interval/NonEmpty.o )
> /tmp/stackage-build2453/intervals-0.8.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb -hide-all-packages -package=Cabal -package=base -package=cabal-doctest Setup
> /tmp/stackage-build2453/intervals-0.8.1$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181120/intervals-0.8.1-BVMSspquwTuF3Ev78eOXKV
> /tmp/stackage-build2453/intervals-0.8.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb -hide-all-packages -package=Cabal -package=base -package=cabal-doctest Setup
> /tmp/stackage-build2453/intervals-0.8.1$ ./Setup register
Registering library for intervals-0.8.1..