> > @@ -1078,6 +1075,9 @@ def coeff(self, x, n=1, right=False):
> >          if not x:
> >              return S.Zero
> >  
> > +        if self.is_Poly:
> 
> I'm undecided on the name.  I do think we should avoid converting to
> expr to do this, though.

Hmm, what would mean copying code ...

Maybe then we should say plain "coeffs" is not
supported for Polys. Not the best solution too.