The build is unreachable.

Build log

> /tmp/stackage-build2453$ stack unpack fast-digits-0.2.1.0@sha256:64e9becfe9dee724f63892348f9e8720d87bbdd6cc475923cd5931c0bfffffd8
Unpacked fast-digits-0.2.1.0 to /tmp/stackage-build2453/fast-digits-0.2.1.0/
> /tmp/stackage-build2453/fast-digits-0.2.1.0$ 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-build2453/fast-digits-0.2.1.0$ ./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/fast-digits-0.2.1.0 --htmldir=/home/circleci/project/builds/nightly/doc/fast-digits-0.2.1.0 --haddockdir=/home/circleci/project/builds/nightly/doc/fast-digits-0.2.1.0
Configuring fast-digits-0.2.1.0...
> /tmp/stackage-build2453/fast-digits-0.2.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2453/fast-digits-0.2.1.0$ ./Setup build
Preprocessing library for fast-digits-0.2.1.0..
Building library for fast-digits-0.2.1.0..
[1 of 2] Compiling Data.FastDigits.Internal ( src/Data/FastDigits/Internal.hs, dist/build/Data/FastDigits/Internal.o )

src/Data/FastDigits/Internal.hs:42:18: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# n, pw2n #) = go pw2
   |
42 |           -> let (# n, pw2n #) = go pw2 in
   |                  ^^^^^^^^^^^^^^^^^^^^^^

src/Data/FastDigits/Internal.hs:53:5: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# power, poweredBase #) = selectPower base
   |
53 |     (# power, poweredBase #) = selectPower base
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[2 of 2] Compiling Data.FastDigits  ( src/Data/FastDigits.hs, dist/build/Data/FastDigits.o )

src/Data/FastDigits.hs:38:30: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# q, r #) = n `quotRemBigNatWord` base
   |
38 |       | otherwise      = let (# q, r #) = n `quotRemBigNatWord` base in
   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Data/FastDigits.hs:51:17: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# q, r #) = n `quotRemWord#` base
   |
51 |     f n   = let (# q, r #) = n `quotRemWord#` base in
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Data/FastDigits.hs:63:9: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# fq, lq #) = g (n `uncheckedShiftRL#` 1#)
   |
63 |         (# fq, lq #) = g (n `uncheckedShiftRL#` 1#)
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Data/FastDigits.hs:70:9: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# q, r #) = n `quotRemWord#` base
   |
70 |         (#  q,  r #) = n `quotRemWord#` base
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Data/FastDigits.hs:71:9: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# fq, lq #) = f q
   |
71 |         (# fq, lq #) = f q
   |         ^^^^^^^^^^^^^^^^^^

src/Data/FastDigits.hs:79:15: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# q, r #) = n `quotRemBigNatWord` poweredBase
   |
79 |     f n = let (# q, r #) = n `quotRemBigNatWord` poweredBase in
   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Data/FastDigits.hs:82:18: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# fr, lr #) = digitsWordL base power r
   |
82 |         else let (# fr, lr #) = digitsWordL base power r in
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Data/FastDigits.hs:95:5: warning: [-Wunbanged-strict-patterns]
    Pattern bindings containing unlifted types should use
    an outermost bang pattern:
      (# power, poweredBase #) = selectPower base
   |
95 |     (# power, poweredBase #) = selectPower base
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> /tmp/stackage-build2453/fast-digits-0.2.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2453/fast-digits-0.2.1.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181120/fast-digits-0.2.1.0-5hMHhV2qzJw8PRCVTOGsOb
> /tmp/stackage-build2453/fast-digits-0.2.1.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2453/fast-digits-0.2.1.0$ ./Setup register
Registering library for fast-digits-0.2.1.0..