Missed SpecConstr opportunity

If you look at the final Core for Csg.calc in nofib/real/fulsom you'll see missed opportunities for SpecConstr.

It has nested join points which look like this:

 join j (x :: Double) = Board (case x of { D# y -> ... })
                              ...
 in ....(j (D# v))....

So the call to j ends up with an explicit (D# v) argument, and SpecConstr should catch it. But alas it does not because this happends nestedly, and SpecConstr is worried about exponential blowup.

Trac metadata

Trac field	Value
Version	8.2.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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