The build is unreachable.

Build log

> /tmp/stackage-build2456$ stack unpack combinatorial-0.1.0.1@sha256:4ab1fdc8650807305af0070f423db3eab664fbde3dbbc61f5f608bd7343f317e
Unpacked combinatorial-0.1.0.1 to /tmp/stackage-build2456/combinatorial-0.1.0.1/
> /tmp/stackage-build2456/combinatorial-0.1.0.1$ 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-build2456/combinatorial-0.1.0.1$ ./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/combinatorial-0.1.0.1 --htmldir=/home/circleci/project/builds/nightly/doc/combinatorial-0.1.0.1 --haddockdir=/home/circleci/project/builds/nightly/doc/combinatorial-0.1.0.1
Configuring combinatorial-0.1.0.1...
> /tmp/stackage-build2456/combinatorial-0.1.0.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/combinatorial-0.1.0.1$ ./Setup build
Preprocessing library for combinatorial-0.1.0.1..
Building library for combinatorial-0.1.0.1..
[ 1 of 14] Compiling Combinatorics.MaxNim ( src/Combinatorics/MaxNim.hs, dist/build/Combinatorics/MaxNim.o )
[ 2 of 14] Compiling Combinatorics.Utility ( src/Combinatorics/Utility.hs, dist/build/Combinatorics/Utility.o )
[ 3 of 14] Compiling Polynomial       ( src/Polynomial.hs, dist/build/Polynomial.o )
[ 4 of 14] Compiling Combinatorics.TreeDepth ( src/Combinatorics/TreeDepth.hs, dist/build/Combinatorics/TreeDepth.o )
[ 5 of 14] Compiling PowerSeries      ( src/PowerSeries.hs, dist/build/PowerSeries.o )
[ 6 of 14] Compiling Combinatorics.Private ( src/Combinatorics/Private.hs, dist/build/Combinatorics/Private.o )
[ 7 of 14] Compiling Combinatorics.Partitions ( src/Combinatorics/Partitions.hs, dist/build/Combinatorics/Partitions.o )
[ 8 of 14] Compiling Combinatorics.Coin ( src/Combinatorics/Coin.hs, dist/build/Combinatorics/Coin.o )
[ 9 of 14] Compiling Combinatorics    ( src/Combinatorics.hs, dist/build/Combinatorics.o )
[10 of 14] Compiling Combinatorics.Permutation.WithoutSomeFixpoints ( src/Combinatorics/Permutation/WithoutSomeFixpoints.hs, dist/build/Combinatorics/Permutation/WithoutSomeFixpoints.o )
[11 of 14] Compiling Combinatorics.PaperStripGame ( src/Combinatorics/PaperStripGame.hs, dist/build/Combinatorics/PaperStripGame.o )
[12 of 14] Compiling Combinatorics.Mastermind ( src/Combinatorics/Mastermind.hs, dist/build/Combinatorics/Mastermind.o )
[13 of 14] Compiling Combinatorics.CardPairs ( src/Combinatorics/CardPairs.hs, dist/build/Combinatorics/CardPairs.o )
[14 of 14] Compiling Combinatorics.BellNumbers ( src/Combinatorics/BellNumbers.hs, dist/build/Combinatorics/BellNumbers.o )
> /tmp/stackage-build2456/combinatorial-0.1.0.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/combinatorial-0.1.0.1$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181117/combinatorial-0.1.0.1-FTur88DQONkEMHlwNIZzld
> /tmp/stackage-build2456/combinatorial-0.1.0.1$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2456/combinatorial-0.1.0.1$ ./Setup register
Registering library for combinatorial-0.1.0.1..