Comment #27 on issue 1620 by asmeurer: Allow derivatives of unknown functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
I would call it Subs, not Eval. And since it's an Uppercase unevaluated class, I think it shouldn't try to split out terms automatically. In other words, Subs(1 + x*f(x).diff(x), x, 0) (or however the syntax looks) should remain exactly that unless you call .doit() on it. c.f. how Integral/integrate() work.
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