The AppVeyor build currently fails with this message:
Building Haskell library
Downloading the latest package list from hackage.haskell.org
cabal.exe: --enable-tests was specified, but tests can't be enabled in a remote package
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.CppCommon.targets(171,5): error MSB6006: "cmd.exe" exited with code 1.
I found this, but I am unsure what to do with that knowledge:
If any Haskellian likes to help out, please do.