The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack freer-simple-1.1.0.0@sha256:aa5c0631baed75040d3139915f2681e0d97287bf90fb967dab9f6a02ed5bb635
Unpacked freer-simple-1.1.0.0 to /tmp/stackage-build2451/freer-simple-1.1.0.0/
> /tmp/stackage-build2451/freer-simple-1.1.0.0$ 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/freer-simple-1.1.0.0$ ./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/freer-simple-1.1.0.0 --htmldir=/home/circleci/project/builds/nightly/doc/freer-simple-1.1.0.0 --haddockdir=/home/circleci/project/builds/nightly/doc/freer-simple-1.1.0.0
Configuring freer-simple-1.1.0.0...
> /tmp/stackage-build2451/freer-simple-1.1.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/freer-simple-1.1.0.0$ ./Setup build
Preprocessing library for freer-simple-1.1.0.0..
Building library for freer-simple-1.1.0.0..
[ 1 of 14] Compiling Data.FTCQueue    ( src/Data/FTCQueue.hs, dist/build/Data/FTCQueue.o )
[ 2 of 14] Compiling Data.OpenUnion.Internal ( src/Data/OpenUnion/Internal.hs, dist/build/Data/OpenUnion/Internal.o )

src/Data/OpenUnion/Internal.hs:39:19: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
39 | data Union (r :: [* -> *]) a where
   |                   ^

src/Data/OpenUnion/Internal.hs:39:24: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
39 | data Union (r :: [* -> *]) a where
   |                        ^

src/Data/OpenUnion/Internal.hs:79:22: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
79 | class FindElem (t :: * -> *) (r :: [* -> *]) where
   |                      ^

src/Data/OpenUnion/Internal.hs:79:27: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
79 | class FindElem (t :: * -> *) (r :: [* -> *]) where
   |                           ^

src/Data/OpenUnion/Internal.hs:79:37: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
79 | class FindElem (t :: * -> *) (r :: [* -> *]) where
   |                                     ^

src/Data/OpenUnion/Internal.hs:79:42: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
79 | class FindElem (t :: * -> *) (r :: [* -> *]) where
   |                                          ^

src/Data/OpenUnion/Internal.hs:99:24: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
99 | class IfNotFound (t :: * -> *) (r :: [* -> *]) (w :: [* -> *])
   |                        ^

src/Data/OpenUnion/Internal.hs:99:29: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
99 | class IfNotFound (t :: * -> *) (r :: [* -> *]) (w :: [* -> *])
   |                             ^

src/Data/OpenUnion/Internal.hs:99:39: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
99 | class IfNotFound (t :: * -> *) (r :: [* -> *]) (w :: [* -> *])
   |                                       ^

src/Data/OpenUnion/Internal.hs:99:44: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
99 | class IfNotFound (t :: * -> *) (r :: [* -> *]) (w :: [* -> *])
   |                                            ^

src/Data/OpenUnion/Internal.hs:99:55: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
99 | class IfNotFound (t :: * -> *) (r :: [* -> *]) (w :: [* -> *])
   |                                                       ^

src/Data/OpenUnion/Internal.hs:99:60: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
   |
99 | class IfNotFound (t :: * -> *) (r :: [* -> *]) (w :: [* -> *])
   |                                                            ^

src/Data/OpenUnion/Internal.hs:131:43: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
    |
131 | class FindElem eff effs => Member (eff :: * -> *) effs where
    |                                           ^

src/Data/OpenUnion/Internal.hs:131:48: warning: [-Wstar-is-type]
    Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
    relies on the StarIsType extension, which will become
    deprecated in the future.
    Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
    |
131 | class FindElem eff effs => Member (eff :: * -> *) effs where
    |                                                ^
[ 3 of 14] Compiling Data.OpenUnion   ( src/Data/OpenUnion.hs, dist/build/Data/OpenUnion.o )
[ 4 of 14] Compiling Control.Monad.Freer.Internal ( src/Control/Monad/Freer/Internal.hs, dist/build/Control/Monad/Freer/Internal.o )
[ 5 of 14] Compiling Control.Monad.Freer.Writer ( src/Control/Monad/Freer/Writer.hs, dist/build/Control/Monad/Freer/Writer.o )
[ 6 of 14] Compiling Control.Monad.Freer.Trace ( src/Control/Monad/Freer/Trace.hs, dist/build/Control/Monad/Freer/Trace.o )
[ 7 of 14] Compiling Control.Monad.Freer.NonDet ( src/Control/Monad/Freer/NonDet.hs, dist/build/Control/Monad/Freer/NonDet.o )
[ 8 of 14] Compiling Control.Monad.Freer.Fresh ( src/Control/Monad/Freer/Fresh.hs, dist/build/Control/Monad/Freer/Fresh.o )
[ 9 of 14] Compiling Control.Monad.Freer.Coroutine ( src/Control/Monad/Freer/Coroutine.hs, dist/build/Control/Monad/Freer/Coroutine.o )
[10 of 14] Compiling Control.Monad.Freer ( src/Control/Monad/Freer.hs, dist/build/Control/Monad/Freer.o )
[11 of 14] Compiling Control.Monad.Freer.State ( src/Control/Monad/Freer/State.hs, dist/build/Control/Monad/Freer/State.o )
[12 of 14] Compiling Control.Monad.Freer.Reader ( src/Control/Monad/Freer/Reader.hs, dist/build/Control/Monad/Freer/Reader.o )
[13 of 14] Compiling Control.Monad.Freer.Error ( src/Control/Monad/Freer/Error.hs, dist/build/Control/Monad/Freer/Error.o )
[14 of 14] Compiling Paths_freer_simple ( dist/build/autogen/Paths_freer_simple.hs, dist/build/Paths_freer_simple.o )
Preprocessing executable 'freer-examples' for freer-simple-1.1.0.0..
Building executable 'freer-examples' for freer-simple-1.1.0.0..
[1 of 7] Compiling Capitalize       ( examples/src/Capitalize.hs, dist/build/freer-examples/freer-examples-tmp/Capitalize.o )
[2 of 7] Compiling Console          ( examples/src/Console.hs, dist/build/freer-examples/freer-examples-tmp/Console.o )
[3 of 7] Compiling Coroutine        ( examples/src/Coroutine.hs, dist/build/freer-examples/freer-examples-tmp/Coroutine.o )
[4 of 7] Compiling Fresh            ( examples/src/Fresh.hs, dist/build/freer-examples/freer-examples-tmp/Fresh.o )
[5 of 7] Compiling Paths_freer_simple ( dist/build/freer-examples/autogen/Paths_freer_simple.hs, dist/build/freer-examples/freer-examples-tmp/Paths_freer_simple.o )
[6 of 7] Compiling Trace            ( examples/src/Trace.hs, dist/build/freer-examples/freer-examples-tmp/Trace.o )
[7 of 7] Compiling Main             ( examples/src/Main.hs, dist/build/freer-examples/freer-examples-tmp/Main.o )
Linking dist/build/freer-examples/freer-examples ...
> /tmp/stackage-build2451/freer-simple-1.1.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/freer-simple-1.1.0.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/freer-simple-1.1.0.0-A4XrCc6hSqqKcyTakw9l8H
Installing executable freer-examples in /home/circleci/project/builds/nightly/bin
> /tmp/stackage-build2451/freer-simple-1.1.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/freer-simple-1.1.0.0$ ./Setup register
Registering library for freer-simple-1.1.0.0..