The build is unreachable.

Build log

> /tmp/stackage-build2456$ stack unpack double-conversion-2.0.2.0@sha256:934ef2ffa06e196ab7df9e130bedee0228dc54bf879822bc2349624e1dfd38e4
Unpacked double-conversion-2.0.2.0 to /tmp/stackage-build2456/double-conversion-2.0.2.0/
> /tmp/stackage-build2456/double-conversion-2.0.2.0$ 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-build2456/double-conversion-2.0.2.0$ ./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/double-conversion-2.0.2.0 --htmldir=/home/circleci/project/builds/nightly/doc/double-conversion-2.0.2.0 --haddockdir=/home/circleci/project/builds/nightly/doc/double-conversion-2.0.2.0
Configuring double-conversion-2.0.2.0...
> /tmp/stackage-build2456/double-conversion-2.0.2.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/double-conversion-2.0.2.0$ ./Setup build
Preprocessing library for double-conversion-2.0.2.0..
Building library for double-conversion-2.0.2.0..
[1 of 3] Compiling Data.Double.Conversion.FFI ( Data/Double/Conversion/FFI.hs, dist/build/Data/Double/Conversion/FFI.o )
[2 of 3] Compiling Data.Double.Conversion.ByteString ( Data/Double/Conversion/ByteString.hs, dist/build/Data/Double/Conversion/ByteString.o )
[3 of 3] Compiling Data.Double.Conversion.Text ( Data/Double/Conversion/Text.hs, dist/build/Data/Double/Conversion/Text.o )
> /tmp/stackage-build2456/double-conversion-2.0.2.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/double-conversion-2.0.2.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181117/double-conversion-2.0.2.0-2bg6loo0k5rKpny3cGYTvu
> /tmp/stackage-build2456/double-conversion-2.0.2.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/double-conversion-2.0.2.0$ ./Setup register
Registering library for double-conversion-2.0.2.0..