The build is unreachable.

Build log

> /tmp/stackage-build2454$ stack unpack exp-pairs-0.2.0.0@sha256:ea22889596322f3aba474a9e0efa22e72af41ca2498d37380df53fafdfa274ba
Unpacked exp-pairs-0.2.0.0 to /tmp/stackage-build2454/exp-pairs-0.2.0.0/
> /tmp/stackage-build2454/exp-pairs-0.2.0.0$ 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-build2454/exp-pairs-0.2.0.0$ ./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/exp-pairs-0.2.0.0 --htmldir=/home/circleci/project/builds/nightly/doc/exp-pairs-0.2.0.0 --haddockdir=/home/circleci/project/builds/nightly/doc/exp-pairs-0.2.0.0
Configuring exp-pairs-0.2.0.0...
> /tmp/stackage-build2454/exp-pairs-0.2.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/exp-pairs-0.2.0.0$ ./Setup build
Preprocessing library for exp-pairs-0.2.0.0..
Building library for exp-pairs-0.2.0.0..
[ 1 of 11] Compiling Math.ExpPairs.Matrix3 ( Math/ExpPairs/Matrix3.hs, dist/build/Math/ExpPairs/Matrix3.o )
[ 2 of 11] Compiling Math.ExpPairs.Pair ( Math/ExpPairs/Pair.hs, dist/build/Math/ExpPairs/Pair.o )
[ 3 of 11] Compiling Math.ExpPairs.ProcessMatrix ( Math/ExpPairs/ProcessMatrix.hs, dist/build/Math/ExpPairs/ProcessMatrix.o )
[ 4 of 11] Compiling Math.ExpPairs.PrettyProcess ( Math/ExpPairs/PrettyProcess.hs, dist/build/Math/ExpPairs/PrettyProcess.o )
[ 5 of 11] Compiling Math.ExpPairs.Process ( Math/ExpPairs/Process.hs, dist/build/Math/ExpPairs/Process.o )
[ 6 of 11] Compiling Math.ExpPairs.RatioInf ( Math/ExpPairs/RatioInf.hs, dist/build/Math/ExpPairs/RatioInf.o )
[ 7 of 11] Compiling Math.ExpPairs.LinearForm ( Math/ExpPairs/LinearForm.hs, dist/build/Math/ExpPairs/LinearForm.o )
[ 8 of 11] Compiling Math.ExpPairs    ( Math/ExpPairs.hs, dist/build/Math/ExpPairs.o )

Math/ExpPairs.hs:48:1: 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()
   |
48 | import Data.Monoid
   | ^^^^^^^^^^^^^^^^^^

Math/ExpPairs.hs:60:1: warning: [-Wmissing-signatures]
    Pattern synonym with no type signature:
      pattern K :: forall a. (Eq a, Num a) => a -> LinearForm a
   |
60 | pattern K n = LinearForm n 0 0
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Math/ExpPairs.hs:62:1: warning: [-Wmissing-signatures]
    Pattern synonym with no type signature:
      pattern L :: forall a. (Eq a, Num a) => a -> LinearForm a
   |
62 | pattern L n = LinearForm 0 n 0
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Math/ExpPairs.hs:64:1: warning: [-Wmissing-signatures]
    Pattern synonym with no type signature:
      pattern M :: forall a. (Eq a, Num a) => a -> LinearForm a
   |
64 | pattern M n = LinearForm 0 0 n
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ 9 of 11] Compiling Math.ExpPairs.MenzerNowak ( Math/ExpPairs/MenzerNowak.hs, dist/build/Math/ExpPairs/MenzerNowak.o )
[10 of 11] Compiling Math.ExpPairs.Ivic ( Math/ExpPairs/Ivic.hs, dist/build/Math/ExpPairs/Ivic.o )
[11 of 11] Compiling Math.ExpPairs.Kratzel ( Math/ExpPairs/Kratzel.hs, dist/build/Math/ExpPairs/Kratzel.o )
> /tmp/stackage-build2454/exp-pairs-0.2.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/exp-pairs-0.2.0.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181122/exp-pairs-0.2.0.0-4LNsyQv8FFeApymccFAo4Y
> /tmp/stackage-build2454/exp-pairs-0.2.0.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2454/exp-pairs-0.2.0.0$ ./Setup register
Registering library for exp-pairs-0.2.0.0..