Unfortunately cabal-dev ghci does not work in this project, i get an error:
Loading package download-0.3.2 ... linking ...
ghc: /home/stulli/haskell/ifdl/cabal-dev//lib/download-0.3.2/ghc-7.4.1/HSdownload-0.3.2.o: unknown symbol `stat64'
ghc: unable to load package `download-0.3.2'
So i try runhaskell, but it uses the packages that come installed with cabal instead of cabal-dev and thus fails.
update: runhaskell produces the same error:
$ runhaskell -isrc:src/test -package-conf=cabal-dev/packages-7.4.1.conf src/test/Test.hs
Test.hs: /home/stulli/haskell/ifdl/cabal-dev//lib/download-0.3.2/ghc-7.4.1/HSdownload-0.3.2.o: unknown symbol `stat64'
Test.hs: Test.hs: unable to load package `download-0.3.2'
cabal-dev install on the other hand works without problems.
You can try something like the next:
runhaskell -package-conf=cabal-dev/packages-7.0.3.conf main.hs
But I think if cabal-dev ghci doesn't work, then runhaskell will not work too. You need to find out what is wrong with download package.