Try limiting to aeson-pretty-0.8.5.
That built before on appveyor...
commitceec41072ae454183d4647b422b26953170cea87
authorJohn MacFarlane <jgm@berkeley.edu>
dateSat 14 Jul 2018, 12:09 (8 years ago)
parentd8a0724
stack.yaml+1
@@ -15,6 +15,7 @@ extra-deps:
1515- haddock-library-1.6.0
1616- HsYAML-0.1.1.1
1717- network-2.7.0.2
18+- aeson-pretty-0.8.5
1819ghc-options:
1920 "$locals": -fhide-source-paths -XNoImplicitPrelude
2021resolver: lts-12.0