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closurePtrs: Cannot handle type CONSTR_NOCAF yet

When using GHC.Exts.Heap.getClosureData on a COSTR_NOCAF (i.e. a static closure with no pointers and three or more non-pointer arguments), we get a spurious

closurePtrs: Cannot handle type CONSTR_NOCAF yet

on stderr. (Handling this is simple, as there are no pointers).

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