Comment #18 on issue 1620 by [email protected]: Allow derivatives of unknown functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
I still think that the best solution would be to use the design of issue 1688#c4. But actually, we can have function objects today, without issue 1688: just use Lambdas. It's certainly less convenient to have FDerivative(Lambda(x, f(x)), 1) than FDerivative(f, 1), but it'll behave correctly - and getting a nicer syntax, for instance 'D(f, 1)', to return that object is not hard.
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