The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack currencies-0.2.0.0@sha256:f8348d79a5b77adeb275c0b2b377c37723dd0b83cfeda1aad62291e57f71381e
Unpacked currencies-0.2.0.0 to /tmp/stackage-build2451/currencies-0.2.0.0/
> /tmp/stackage-build2451/currencies-0.2.0.0$ 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-build2451/currencies-0.2.0.0$ ./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/currencies-0.2.0.0 --htmldir=/home/circleci/project/builds/nightly/doc/currencies-0.2.0.0 --haddockdir=/home/circleci/project/builds/nightly/doc/currencies-0.2.0.0
Configuring currencies-0.2.0.0...
> /tmp/stackage-build2451/currencies-0.2.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/currencies-0.2.0.0$ ./Setup build
Preprocessing library for currencies-0.2.0.0..
Building library for currencies-0.2.0.0..
[1 of 3] Compiling Data.Currency.Currencies ( src/Data/Currency/Currencies.hs, dist/build/Data/Currency/Currencies.o )
[2 of 3] Compiling Data.Currency.Amounts ( src/Data/Currency/Amounts.hs, dist/build/Data/Currency/Amounts.o )
[3 of 3] Compiling Data.Currency.Pretty ( src/Data/Currency/Pretty.hs, dist/build/Data/Currency/Pretty.o )
> /tmp/stackage-build2451/currencies-0.2.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/currencies-0.2.0.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181121/currencies-0.2.0.0-I22qPZeoFwH2g8rYPQ20mp
> /tmp/stackage-build2451/currencies-0.2.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/currencies-0.2.0.0$ ./Setup register
Registering library for currencies-0.2.0.0..