The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack xmonad-0.15@sha256:db671d78ecd66f39f23decf60974a3e078525ec9d2be68a3946b0cfb4d3954fa
Unpacked xmonad-0.15 to /tmp/stackage-build2452/xmonad-0.15/
> /tmp/stackage-build2452/xmonad-0.15$ 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-build2452/xmonad-0.15$ ./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/xmonad-0.15 --htmldir=/home/circleci/project/builds/nightly/doc/xmonad-0.15 --haddockdir=/home/circleci/project/builds/nightly/doc/xmonad-0.15
Configuring xmonad-0.15...
> /tmp/stackage-build2452/xmonad-0.15$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/xmonad-0.15$ ./Setup build
Preprocessing library for xmonad-0.15..
Building library for xmonad-0.15..
[1 of 9] Compiling Paths_xmonad     ( dist/build/autogen/Paths_xmonad.hs, dist/build/Paths_xmonad.o )
[2 of 9] Compiling XMonad.StackSet  ( src/XMonad/StackSet.hs, dist/build/XMonad/StackSet.o )
[3 of 9] Compiling XMonad.Core      ( src/XMonad/Core.hs, dist/build/XMonad/Core.o )

src/XMonad/Core.hs:61:1: 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()
   |
61 | import Data.Monoid hiding ((<>))
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/XMonad/Core.hs:559:5: warning: [-Wname-shadowing]
    This binding for ‘get’ shadows the existing binding
      imported from ‘Control.Monad.State’ at src/XMonad/Core.hs:41:1-26
      (and originally defined in ‘Control.Monad.State.Class’)
    |
559 |     get name fallback = do
    |     ^^^

src/XMonad/Core.hs:560:7: warning: [-Wname-shadowing]
    This binding for ‘env’ shadows the existing binding
      imported from ‘System.Process’ at src/XMonad/Core.hs:53:1-21
      (and originally defined in ‘process-1.6.3.0:System.Process.Common’)
    |
560 |       env <- lookupEnv name
    |       ^^^
[4 of 9] Compiling XMonad.Layout    ( src/XMonad/Layout.hs, dist/build/XMonad/Layout.o )
[5 of 9] Compiling XMonad.Operations ( src/XMonad/Operations.hs, dist/build/XMonad/Operations.o )
[6 of 9] Compiling XMonad.ManageHook ( src/XMonad/ManageHook.hs, dist/build/XMonad/ManageHook.o )
[7 of 9] Compiling XMonad.Config    ( src/XMonad/Config.hs, dist/build/XMonad/Config.o )
[8 of 9] Compiling XMonad.Main      ( src/XMonad/Main.hs, dist/build/XMonad/Main.o )

src/XMonad/Main.hs:70:42: warning: [-Wdeprecations]
    In the use of ‘migrateState’ (imported from XMonad.Operations):
    Deprecated: "will be removed some point in the future."
   |
70 |         ("--resume": ws : xs : args') -> migrateState ws xs >> launch' args'
   |                                          ^^^^^^^^^^^^
[9 of 9] Compiling XMonad           ( src/XMonad.hs, dist/build/XMonad.o )
Preprocessing executable 'xmonad' for xmonad-0.15..
Building executable 'xmonad' for xmonad-0.15..
[1 of 1] Compiling Main             ( Main.hs, dist/build/xmonad/xmonad-tmp/Main.o )
Linking dist/build/xmonad/xmonad ...
> /tmp/stackage-build2452/xmonad-0.15$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/xmonad-0.15$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/xmonad-0.15-KoZ2ks1HzMmA98RIecGfWO
Installing executable xmonad in /home/circleci/project/builds/nightly/bin
> /tmp/stackage-build2452/xmonad-0.15$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/xmonad-0.15$ ./Setup register
Registering library for xmonad-0.15..