On Tue, Mar 20, 2012 at 11:26:17AM +0000, Simon Marlow wrote: > > Incidentally, a better fix is to use RET_NN(), which will avoid the > #ifdef. See PrimOps.cmm for some examples. Aha, that's great, thanks! I've done this, and will take a look at the other Unreg ifdefs. Thanks Ian