I have the following Setup.hs with build-type: Custom:

import           Distribution.Simple
import           System.Process (system)

main = defaultMainWithHooks
         simpleUserHooks { preConf = \args confFlags -> do
           system "./build-parser.sh"
           preConf simpleUserHooks args confFlags }

This generates a module named Reskin.Parser in src/Reskin/Parser.hs. If I don't include Reskin.Parser in other-modules, things work; if I do, stack complains that Parser.hs doesn't exist (instead of just running Setup.hs which generates Parser.hs in the right place).

This is using stack just upgraded today via stack upgrade --git. I can get this to work only if I run cabal configure

Is this a me problem or a stack problem?