throw is an expression, not a statement, in C++. I see no reason raise
couldn't be an expression in Python. It doesn't even need a special
rule in the grammar:
from __future__ import raise_function
foo.setParseAction(lambda a, b, c: raise(MumbleMumble()))
Looking up and calling the raise function would add overhead to every
explicitly raised exception, but exceptions are so expensive anyway
that I think it wouldn't be noticeable.
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