The following does not complain:
###
>>> var('x')
x
>>> x(1)
x(1)
###
I wish this would raise an error... If x isn't a function, what
meaning would x(1) have? One problem with no warning being given is
that if you import everything from symp.abc as in "from symp.abc
import *" you will wipe out S and N as special sympy classes. Then,
because S(1) will not complain about not being a function,
calculations will proceed but S(1) will not behave like S.One.
Perhaps there's a good reason for this behavior...just wondering what
it might be.
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