The build is unreachable.

Build log

> /tmp/stackage-build2454$ stack unpack cabal2spec-2.2.2@sha256:bc6a5b6a95fd380ed28194e5c7017d04fe2b34f876efc9a7a11021e8a92e8aec
Unpacked cabal2spec-2.2.2 to /tmp/stackage-build2454/cabal2spec-2.2.2/
> /tmp/stackage-build2454/cabal2spec-2.2.2$ 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-build2454/cabal2spec-2.2.2$ ./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/cabal2spec-2.2.2 --htmldir=/home/circleci/project/builds/nightly/doc/cabal2spec-2.2.2 --haddockdir=/home/circleci/project/builds/nightly/doc/cabal2spec-2.2.2
Configuring cabal2spec-2.2.2...
> /tmp/stackage-build2454/cabal2spec-2.2.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/cabal2spec-2.2.2$ ./Setup build
Preprocessing library for cabal2spec-2.2.2..
Building library for cabal2spec-2.2.2..
[1 of 1] Compiling Cabal2Spec       ( src/Cabal2Spec.hs, dist/build/Cabal2Spec.o )
Preprocessing executable 'cabal2spec' for cabal2spec-2.2.2..
Building executable 'cabal2spec' for cabal2spec-2.2.2..
[1 of 2] Compiling Paths_cabal2spec ( dist/build/cabal2spec/autogen/Paths_cabal2spec.hs, dist/build/cabal2spec/cabal2spec-tmp/Paths_cabal2spec.o )
[2 of 2] Compiling Main             ( cabal2spec/Main.hs, dist/build/cabal2spec/cabal2spec-tmp/Main.o )

cabal2spec/Main.hs:9:1: warning: [-Wunused-imports]
    The import of ‘Data.Monoid’ is redundant
      except perhaps to import instances from ‘Data.Monoid’
    To import instances alone, use: import Data.Monoid()
  |
9 | import Data.Monoid
  | ^^^^^^^^^^^^^^^^^^
Linking dist/build/cabal2spec/cabal2spec ...
> /tmp/stackage-build2454/cabal2spec-2.2.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/cabal2spec-2.2.2$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181117/cabal2spec-2.2.2-Fp1w8PJA09xDltnEFgZ0Zr
Installing executable cabal2spec in /home/circleci/project/builds/nightly/bin
> /tmp/stackage-build2454/cabal2spec-2.2.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/cabal2spec-2.2.2$ ./Setup register
Registering library for cabal2spec-2.2.2..