Comment #26 on issue 2571 by smi...@gmail.com: Regression in Integral.subs
http://code.google.com/p/sympy/issues/detail?id=2571
So could the rule be:
1) allow subs(x, u) always and it changes x to u everywhere
2) allow subs(f(x), f(x)) as long as x does not appear in any limit as a
limit (but it can be an integration variable)
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