[Bug 1190949] New: hedgewars won't build with ghc 7.8.4

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1190949

            Bug ID: 1190949
           Summary: hedgewars won't build with ghc 7.8.4
           Product: Fedora
           Version: rawhide
         Component: ghc
          Assignee: petersen at redhat.com
          Reporter: bruno at wolff.to
        QA Contact: extras-qa at fedoraproject.org
                CC: bos at serpentine.com,
                    haskell-devel at lists.fedoraproject.org,
                    petersen at redhat.com



Description of problem:

While this isn't a bug in ghc I need some ghc expertise to get hedgewars
building again in rawhide.

An example fsiled build log is at
https://kojipkgs.fedoraproject.org//work/tasks/7888/8877888/build.log

The problem code is from a patch to work around not having Text.Show.ByteString
in Fedora. The snippet that appears to be the problem is:

exceptionMask:: ((forall a. IO a -> IO a) -> IO b) -> IO b
exceptionMask io = do
    b <- blocked
    if b then io id else block (io unblock)

Any help with this would be appreciated.

I'll switch the bug to hedgewars. The initial assignment to ghc is to copy some
ghc experts.

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