Comment #2 on issue 2594 by asmeurer: Better handling of multi-line statements at SymPy Live
http://code.google.com/p/sympy/issues/detail?id=2594
Ah, you're right. I forgot about things like automatic continuation with unclosed parentheses. I think the solution you suggest would work.
Would we have to change it so that it works like Python or IPython where you need an extra newline to finish a function definition? Like
def f(x):
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