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Simon Peyton Jones authored
I have spent altogether too long on my attempt to avoid case-of-case in situations where it is a Bad Thing. All the action is in the case for mkDupableAlt that handles cases with a single alternative. I've added rather extensive comments, and it finally seems to be working more or less right. If you compile (say) GHC/Real.o you'll see quite a few case-of-cases remain (which didn't happen before), and they mostly look pretty sensible to me.
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