The following is giving me a headache.  In a fresh session, do

sage: R.<a> = InfinitePolynomialRing(SR)
sage: p = a[0].polynomial()
sage: R(p)
...
RuntimeError: Symbolic Ring still using old coercion framework

I tried all day to make sense of the element_constructor of the 
InfinitePolynomialRIng (which uses sage_eval to interpret the repr), but I 
failed.

Martin

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