The following shows what I'd like to do:

F.<x>=GF(2^8,name='x')
R.<y>=PolynomialRing(Zmod(2))
p = F.random_element()
p.subs(x=y)

Basically, I have an object which is created as an element of a finite
field, which I then need to treat as an element of a ring.  If I try:

pp = p.polynomial()
pp.subs(x=y)

that produces an error.  Clearly I could obtain all the coefficients
of p and create a new polynomial from them, but that seems a bit
clumsy.  Is there a more direct way?

Thanks,
Alasdair

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