Comment #2 on issue 2677 by asmeurer: subs(Eq) does not work http://code.google.com/p/sympy/issues/detail?id=2677
It should just work as Eq(old, new). I don't think there's anything unexpected there. In fact, based on the traceback, if we allowed list(Eq(a, b)) == [a, b], then it would just work.
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