Colin I saw your porting-ghc blog posthttp://www.chiark.greenend.org.uk/ucgi/~cjwatson/blosxom/2014-04-15-porting-... (via the Haskell Weekly News) today. What a great post! Porting GHC to new architectures is way beyond the slender resources of GHC HQ, so depends utterly on volunteers. And you see to be a particularly skilled and knowledgeable one. Thank you! Simon PS: where you have offered patches to the main sources (e.g the function-prototype thing), did you elaborately comment the "technically wrong" prototype? I have this fear that in three year's time someone is going to say "oh, we could do better with that prototype" and re-introduce the bug! Aha. I've just checked #8965, and there's no comment at all. I'll add the commit message as a comment. Other ghc-devs, nb! Adding the ticket number to the comment is also fantastically helpful, because it often points to examples and discussion that are too long to include in the code.