I think it was agreed in the other PR that loosing this functionality 
would not be a big problem, or should be handled by a heuristic on its own.

On 16.04.2013 13:24, AnkitAgrawal wrote:
> In sympy/series/limits.py:
>
>>  @@ -185,7 +185,10 @@ def _sift(term):
>>                   else:
>>                       finite.append(term)
>>               else:
>>  -                result = term.subs(z, z0)
>>  +                try:
>>  +                    result = limit(term, z, z0)
>>  +                except NotImplementedError:
>
> @ness01 <https://github.com/ness01> : it breaks the test at
> https://github.com/sympy/sympy/blob/master/sympy/series/tests/test_limits.py#L34
> yielding
> NotImplementedError: Don't know how to calculate the mrv of 'Sum(1/x,
> (x, 1, _p))'
>
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>