In Sage 9.2, attempting to define a callable symbolic expression with a
backslash line continuation yields a syntax error:
sage: f(x) = x \
....: +
1
File "<ipython-input-2-a5c1e14e19da>", line 1
__tmp__=var("x"); f = symbolic_expression(x * BackslashOperator() *
).function(x)
^
SyntaxError: invalid syntax
There was no such issue in Sage 9.1.
A culprit might be https://trac.sagemath.org/ticket/28974, since it deals
with the preparser and backslashes, but I am not sure...
Eric.
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