[project @ 2001-11-01 10:33:58 by simonpj]
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Fix a bug in Simplify.mkDupableAlt
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[This is the HEAD commit; I've fixed
the branch separately.]
This fixes a funResultTy panic that Koen encountered.
The reason was that the simplifier was doing a
case-of-case where the result had a polymorphic type.
This in turn showed up because of a newtype (now
transparent) with a forall inside it.
The fix is very easy; can't think how I got it wrong
in the first place.