Comment #2 on issue 1607 by asmeurer: evaluating functions with singularity  
should not return a number
http://code.google.com/p/sympy/issues/detail?id=1607

I'm not so sure that this shouldn't be working.  It's not an infinite  
singularity. Maple also returns a value:

> integrate(sin(x)/x, x=-1..1);
                                    2 Si(1)
> evalf(2*Si(1));
                                  1.892166141


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