The build is unreachable.

Build log

> /tmp/stackage-build2456$ stack unpack safe-exceptions-checked-0.1.0@sha256:ae142f284c6b102f0e7606a69a5719f4f72771d9cc353af72fa4484326689100
Unpacked safe-exceptions-checked-0.1.0 to /tmp/stackage-build2456/safe-exceptions-checked-0.1.0/
> /tmp/stackage-build2456/safe-exceptions-checked-0.1.0$ 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/safe-exceptions-checked-0.1.0$ ./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/safe-exceptions-checked-0.1.0 --htmldir=/home/circleci/project/builds/nightly/doc/safe-exceptions-checked-0.1.0 --haddockdir=/home/circleci/project/builds/nightly/doc/safe-exceptions-checked-0.1.0
Configuring safe-exceptions-checked-0.1.0...
> /tmp/stackage-build2456/safe-exceptions-checked-0.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/safe-exceptions-checked-0.1.0$ ./Setup build
Preprocessing library for safe-exceptions-checked-0.1.0..
Building library for safe-exceptions-checked-0.1.0..
[1 of 1] Compiling Control.Exception.Safe.Checked ( src/Control/Exception/Safe/Checked.hs, dist/build/Control/Exception/Safe/Checked.o )

src/Control/Exception/Safe/Checked.hs:158:19: warning: [-Wunused-top-binds]
    Defined but not used: data constructor ‘Catch’
    |
158 | newtype Catch a = Catch a
    |                   ^^^^^^^
> /tmp/stackage-build2456/safe-exceptions-checked-0.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/safe-exceptions-checked-0.1.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181117/safe-exceptions-checked-0.1.0-5GfrPhIuo4hF9g2CB3LO7p
> /tmp/stackage-build2456/safe-exceptions-checked-0.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/safe-exceptions-checked-0.1.0$ ./Setup register
Registering library for safe-exceptions-checked-0.1.0..