The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack xml-picklers-0.3.6@sha256:db58bca602c08c220be405013a64d7afd3d7e23c7b3a2c5bb383b6ea45cdf209
Unpacked xml-picklers-0.3.6 to /tmp/stackage-build2452/xml-picklers-0.3.6/
> /tmp/stackage-build2452/xml-picklers-0.3.6$ 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-build2452/xml-picklers-0.3.6$ ./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/xml-picklers-0.3.6 --htmldir=/home/circleci/project/builds/nightly/doc/xml-picklers-0.3.6 --haddockdir=/home/circleci/project/builds/nightly/doc/xml-picklers-0.3.6
Configuring xml-picklers-0.3.6...
> /tmp/stackage-build2452/xml-picklers-0.3.6$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/xml-picklers-0.3.6$ ./Setup build
Preprocessing library for xml-picklers-0.3.6..
Building library for xml-picklers-0.3.6..
[1 of 3] Compiling Data.XML.Pickle.Basic ( src/Data/XML/Pickle/Basic.hs, dist/build/Data/XML/Pickle/Basic.o )

src/Data/XML/Pickle/Basic.hs:7:1: warning: [-Wunused-imports]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()
  |
7 | import           Control.Applicative
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Data/XML/Pickle/Basic.hs:88:16: warning: [-Wtype-defaults]
    • Defaulting the following constraints to type ‘Integer’
        (Ord a0)
          arising from a use of ‘>’ at src/Data/XML/Pickle/Basic.hs:88:16-20
        (Num a0)
          arising from the literal ‘0’ at src/Data/XML/Pickle/Basic.hs:88:20
        (Show a0)
          arising from a use of ‘show’
          at src/Data/XML/Pickle/Basic.hs:89:28-37
        (Num a0)
          arising from a use of ‘collapsSteps’
          at src/Data/XML/Pickle/Basic.hs:86:20-36
    • In the expression: n > 0
      In the second argument of ‘(++)’, namely
        ‘if n > 0 then (" [x" ++ show (n + 1) ++ "]") else ""’
      In the second argument of ‘(++)’, namely
        ‘showTr t ++ if n > 0 then (" [x" ++ show (n + 1) ++ "]") else ""’
   |
88 |          ++ if n > 0
   |                ^^^^^

src/Data/XML/Pickle/Basic.hs:93:18: warning: [-Wname-shadowing]
    This binding for ‘t’ shadows the existing binding
      bound at src/Data/XML/Pickle/Basic.hs:85:21
   |
93 |     collapsSteps t (TraceStep t' ns) | t == t'
   |                  ^

src/Data/XML/Pickle/Basic.hs:96:20: warning: [-Wname-shadowing]
    This binding for ‘es’ shadows the existing binding
      bound at src/Data/XML/Pickle/Basic.hs:85:23
   |
96 |     collapsSteps _ es = (0, es)
   |                    ^^
[2 of 3] Compiling Data.XML.Pickle.Tuples ( src/Data/XML/Pickle/Tuples.hs, dist/build/Data/XML/Pickle/Tuples.o )
[3 of 3] Compiling Data.XML.Pickle  ( src/Data/XML/Pickle.hs, dist/build/Data/XML/Pickle.o )
> /tmp/stackage-build2452/xml-picklers-0.3.6$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/xml-picklers-0.3.6$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/xml-picklers-0.3.6-355Q2kpCJrM3ITCIqZIDLV
> /tmp/stackage-build2452/xml-picklers-0.3.6$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/xml-picklers-0.3.6$ ./Setup register
Registering library for xml-picklers-0.3.6..