The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack simple-sendfile-0.2.27@sha256:0f64a907a08255d01b9ab58e6c9f72e3f42c22948303c2e914b1b53034a1fa2f
Unpacked simple-sendfile-0.2.27 to /tmp/stackage-build2451/simple-sendfile-0.2.27/
> /tmp/stackage-build2451/simple-sendfile-0.2.27$ 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/simple-sendfile-0.2.27$ ./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/simple-sendfile-0.2.27 --htmldir=/home/circleci/project/builds/nightly/doc/simple-sendfile-0.2.27 --haddockdir=/home/circleci/project/builds/nightly/doc/simple-sendfile-0.2.27
Configuring simple-sendfile-0.2.27...
> /tmp/stackage-build2451/simple-sendfile-0.2.27$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/simple-sendfile-0.2.27$ ./Setup build
Preprocessing library for simple-sendfile-0.2.27..
Building library for simple-sendfile-0.2.27..
[1 of 4] Compiling Network.Sendfile.Types ( Network/Sendfile/Types.hs, dist/build/Network/Sendfile/Types.o )
[2 of 4] Compiling Network.Sendfile.Linux ( dist/build/Network/Sendfile/Linux.hs, dist/build/Network/Sendfile/Linux.o )

Network/Sendfile/Linux.hsc:12:1: warning: [-Wunused-imports]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()
   |
12 | import Control.Applicative
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^

Network/Sendfile/Linux.hsc:17:1: warning: [-Wunused-imports]
    The import of ‘Data.Int’ is redundant
      except perhaps to import instances from ‘Data.Int’
    To import instances alone, use: import Data.Int()
   |
17 | import Data.Int
   | ^^^^^^^^^^^^^^^
[3 of 4] Compiling Network.Sendfile ( Network/Sendfile.hs, dist/build/Network/Sendfile.o )
[4 of 4] Compiling System.Linux.Sendfile ( System/Linux/Sendfile.hs, dist/build/System/Linux/Sendfile.o )
> /tmp/stackage-build2451/simple-sendfile-0.2.27$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/simple-sendfile-0.2.27$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181121/simple-sendfile-0.2.27-AzGy3B5mlF94BU1bxLdIYj
> /tmp/stackage-build2451/simple-sendfile-0.2.27$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/simple-sendfile-0.2.27$ ./Setup register
Registering library for simple-sendfile-0.2.27..