https://bugzilla.redhat.com/show_bug.cgi?id=1118232
--- Comment #3 from Jens Petersen petersen@redhat.com --- (In reply to Peter Robinson from comment #2)
I may try to see if things are better under ghc-7.8 before investigating further...
Is 7.8 going to land in F-21?
It was originally planned but we're behind schedule so I don't think so at this point.