The build is unreachable.

Build log

> /tmp/stackage-build2453$ stack unpack heap-1.0.4@sha256:ad0e192efbff268e85042068c308c69fa6c787c3cd6ab96c34f89e5bfee01cf9
Unpacked heap-1.0.4 to /tmp/stackage-build2453/heap-1.0.4/
> /tmp/stackage-build2453/heap-1.0.4$ 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-build2453/heap-1.0.4$ ./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/heap-1.0.4 --htmldir=/home/circleci/project/builds/nightly/doc/heap-1.0.4 --haddockdir=/home/circleci/project/builds/nightly/doc/heap-1.0.4
Configuring heap-1.0.4...
> /tmp/stackage-build2453/heap-1.0.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2453/heap-1.0.4$ ./Setup build
Preprocessing library for heap-1.0.4..
Building library for heap-1.0.4..
[1 of 3] Compiling Data.Heap.Internal ( Data/Heap/Internal.hs, dist/build/Data/Heap/Internal.o )
[2 of 3] Compiling Data.Heap.Item   ( Data/Heap/Item.hs, dist/build/Data/Heap/Item.o )

Data/Heap/Item.hs:100:11: warning: [-Winline-rule-shadowing]
    Rule "split/merge" may never fire
      because rule "Class op merge" for ‘merge’ might fire first
    Probable fix: add phase [n] or [~n] to the competing rule
    |
100 | {-# RULES "split/merge" forall x. split (merge x) = x #-}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Data/Heap/Item.hs:188:11: warning: [-Winline-rule-shadowing]
    Rule "splitF/split" may never fire
      because rule "Class op split" for ‘split’ might fire first
    Probable fix: add phase [n] or [~n] to the competing rule
    |
188 | {-# RULES "splitF/split" forall f x. splitF f (split x) = f x #-}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[3 of 3] Compiling Data.Heap        ( Data/Heap.hs, dist/build/Data/Heap.o )
> /tmp/stackage-build2453/heap-1.0.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2453/heap-1.0.4$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181120/heap-1.0.4-1bixUWOUQHO7NNm7CPtUox
> /tmp/stackage-build2453/heap-1.0.4$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2453/heap-1.0.4$ ./Setup register
Registering library for heap-1.0.4..