The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack HTTP-4000.3.12@sha256:0c551ef7495be186408848c125163af372b2916e4964b72cc7fa111beeef86bf
Unpacked HTTP-4000.3.12 to /tmp/stackage-build2451/HTTP-4000.3.12/
> /tmp/stackage-build2451/HTTP-4000.3.12$ 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/HTTP-4000.3.12$ ./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/HTTP-4000.3.12 --htmldir=/home/circleci/project/builds/nightly/doc/HTTP-4000.3.12 --haddockdir=/home/circleci/project/builds/nightly/doc/HTTP-4000.3.12
Configuring HTTP-4000.3.12...
> /tmp/stackage-build2451/HTTP-4000.3.12$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/HTTP-4000.3.12$ ./Setup build
Preprocessing library for HTTP-4000.3.12..
Building library for HTTP-4000.3.12..
[ 1 of 18] Compiling Network.HTTP.Base64 ( Network/HTTP/Base64.hs, dist/build/Network/HTTP/Base64.o )
[ 2 of 18] Compiling Network.HTTP.MD5Aux ( Network/HTTP/MD5Aux.hs, dist/build/Network/HTTP/MD5Aux.o )
[ 3 of 18] Compiling Network.HTTP.Utils ( Network/HTTP/Utils.hs, dist/build/Network/HTTP/Utils.o )
[ 4 of 18] Compiling Network.BufferType ( Network/BufferType.hs, dist/build/Network/BufferType.o )
[ 5 of 18] Compiling Network.Stream   ( Network/Stream.hs, dist/build/Network/Stream.o )

Network/Stream.hs:35:1: warning: [-Wdeprecations]
    Module ‘Control.Monad.Error’ is deprecated:
      Use "Control.Monad.Except" instead
   |
35 | import Control.Monad.Error
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^

Network/Stream.hs:44:10: warning: [-Wdeprecations]
    In the use of type constructor or class ‘Error’
    (imported from Control.Monad.Error, but defined in transformers-0.5.5.0:Control.Monad.Trans.Error):
    Deprecated: "Use Control.Monad.Trans.Except instead"
   |
44 | instance Error ConnError where
   |          ^^^^^

Network/Stream.hs:44:10: warning: [-Wdeprecations]
    In the use of type constructor or class ‘Error’
    (imported from Control.Monad.Error, but defined in transformers-0.5.5.0:Control.Monad.Trans.Error):
    Deprecated: "Use Control.Monad.Trans.Except instead"
   |
44 | instance Error ConnError where
   |          ^^^^^

Network/Stream.hs:45:11: warning: [-Wdeprecations]
    In the use of ‘strMsg’
    (imported from Control.Monad.Error, but defined in transformers-0.5.5.0:Control.Monad.Trans.Error):
    Deprecated: "Use Control.Monad.Trans.Except instead"
   |
45 |   noMsg = strMsg "unknown error"
   |           ^^^^^^

Network/Stream.hs:52:24: warning: [-Wdeprecations]
    In the use of ‘strMsg’
    (imported from Control.Monad.Error, but defined in transformers-0.5.5.0:Control.Monad.Trans.Error):
    Deprecated: "Use Control.Monad.Trans.Except instead"
   |
52 | failMisc x = failWith (strMsg x)
   |                        ^^^^^^
[ 6 of 18] Compiling Network.HTTP.Headers ( Network/HTTP/Headers.hs, dist/build/Network/HTTP/Headers.o )
[ 7 of 18] Compiling Network.HTTP.Cookie ( Network/HTTP/Cookie.hs, dist/build/Network/HTTP/Cookie.o )
[ 8 of 18] Compiling Paths_HTTP       ( dist/build/autogen/Paths_HTTP.hs, dist/build/Paths_HTTP.o )
[ 9 of 18] Compiling Network.HTTP.Base ( Network/HTTP/Base.hs, dist/build/Network/HTTP/Base.o )

Network/HTTP/Base.hs:110:1: warning: [-Wdeprecations]
    Module ‘Control.Monad.Error’ is deprecated:
      Use "Control.Monad.Except" instead
    |
110 | import Control.Monad.Error ()
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[10 of 18] Compiling Network.TCP      ( Network/TCP.hs, dist/build/Network/TCP.o )

Network/TCP.hs:245:32: warning: [-Wdeprecations]
    In the use of ‘sClose’ (imported from Network.Socket):
    Deprecated: "use 'close'"
    |
245 |                             ) (sClose s)
    |                                ^^^^^^

Network/TCP.hs:298:5: warning: [-Wdeprecations]
    In the use of ‘sClose’ (imported from Network.Socket):
    Deprecated: "use 'close'"
    |
298 |     sClose sk
    |     ^^^^^^
[11 of 18] Compiling Network.StreamDebugger ( Network/StreamDebugger.hs, dist/build/Network/StreamDebugger.o )
[12 of 18] Compiling Network.StreamSocket ( Network/StreamSocket.hs, dist/build/Network/StreamSocket.o )

Network/StreamSocket.hs:53:21: warning: [-Wdeprecations]
    In the use of ‘recv’ (imported from Network.Socket):
    Deprecated: "Use recv defined in "Network.Socket.ByteString""
   |
53 |         in catchIO (recv sock len) handler
   |                     ^^^^

Network/StreamSocket.hs:62:10: warning: [-Wdeprecations]
    In the use of ‘sClose’ (imported from Network.Socket):
    Deprecated: "use 'close'"
   |
62 |          sClose sk
   |          ^^^^^^

Network/StreamSocket.hs:92:12: warning: [-Wdeprecations]
    In the use of ‘send’ (imported from Network.Socket):
    Deprecated: "Use send defined in "Network.Socket.ByteString""
   |
92 |    fn x  = send sk x >>= \i -> fn (drop i x)
   |            ^^^^
[13 of 18] Compiling Network.HTTP.Stream ( Network/HTTP/Stream.hs, dist/build/Network/HTTP/Stream.o )
[14 of 18] Compiling Network.HTTP.HandleStream ( Network/HTTP/HandleStream.hs, dist/build/Network/HTTP/HandleStream.o )
[15 of 18] Compiling Network.HTTP.Auth ( Network/HTTP/Auth.hs, dist/build/Network/HTTP/Auth.o )
[16 of 18] Compiling Network.HTTP.Proxy ( Network/HTTP/Proxy.hs, dist/build/Network/HTTP/Proxy.o )
[17 of 18] Compiling Network.HTTP     ( Network/HTTP.hs, dist/build/Network/HTTP.o )
[18 of 18] Compiling Network.Browser  ( Network/Browser.hs, dist/build/Network/Browser.o )
> /tmp/stackage-build2451/HTTP-4000.3.12$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/HTTP-4000.3.12$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/HTTP-4000.3.12-Bh6cI7FJjXJ1Tjb7QyfvBf
> /tmp/stackage-build2451/HTTP-4000.3.12$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/HTTP-4000.3.12$ ./Setup register
Registering library for HTTP-4000.3.12..