The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack hsass-0.7.0@sha256:05a1c612051dc030cbc7bb702a239d3ceb62d601903f8ff41e3b76e2fe10da18
Unpacked hsass-0.7.0 to /tmp/stackage-build2451/hsass-0.7.0/
> /tmp/stackage-build2451/hsass-0.7.0$ 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/hsass-0.7.0$ ./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/hsass-0.7.0 --htmldir=/home/circleci/project/builds/nightly/doc/hsass-0.7.0 --haddockdir=/home/circleci/project/builds/nightly/doc/hsass-0.7.0
Configuring hsass-0.7.0...
> /tmp/stackage-build2451/hsass-0.7.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/hsass-0.7.0$ ./Setup build
Preprocessing library for hsass-0.7.0..
Building library for hsass-0.7.0..
[ 1 of 12] Compiling Text.Sass.Marshal.Internal ( Text/Sass/Marshal/Internal.hs, dist/build/Text/Sass/Marshal/Internal.o )
[ 2 of 12] Compiling Text.Sass.Utils  ( Text/Sass/Utils.hs, dist/build/Text/Sass/Utils.o )
[ 3 of 12] Compiling Text.Sass.Values ( Text/Sass/Values.hs, dist/build/Text/Sass/Values.o )
[ 4 of 12] Compiling Text.Sass.Functions ( Text/Sass/Functions.hs, dist/build/Text/Sass/Functions.o )
[ 5 of 12] Compiling Text.Sass.Options ( Text/Sass/Options.hs, dist/build/Text/Sass/Options.o )
[ 6 of 12] Compiling Text.Sass.Values.Internal ( Text/Sass/Values/Internal.hs, dist/build/Text/Sass/Values/Internal.o )
[ 7 of 12] Compiling Text.Sass.Functions.Internal ( Text/Sass/Functions/Internal.hs, dist/build/Text/Sass/Functions/Internal.o )
[ 8 of 12] Compiling Text.Sass.Options.Internal ( Text/Sass/Options/Internal.hs, dist/build/Text/Sass/Options/Internal.o )
[ 9 of 12] Compiling Text.Sass.Internal ( Text/Sass/Internal.hs, dist/build/Text/Sass/Internal.o )
[10 of 12] Compiling Text.Sass.Compilation ( Text/Sass/Compilation.hs, dist/build/Text/Sass/Compilation.o )

Text/Sass/Compilation.hs:39:1: warning: [-Wunused-imports]
    The import of ‘Data.Maybe’ is redundant
      except perhaps to import instances from ‘Data.Maybe’
    To import instances alone, use: import Data.Maybe()
   |
39 | import           Data.Maybe                     (fromMaybe)
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[11 of 12] Compiling Text.Sass        ( Text/Sass.hs, dist/build/Text/Sass.o )
[12 of 12] Compiling Text.Sass.Values.Utils ( Text/Sass/Values/Utils.hs, dist/build/Text/Sass/Values/Utils.o )
> /tmp/stackage-build2451/hsass-0.7.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/hsass-0.7.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181121/hsass-0.7.0-72ivlrbE7nFAVrywDuuENY
> /tmp/stackage-build2451/hsass-0.7.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/hsass-0.7.0$ ./Setup register
Registering library for hsass-0.7.0..