Sven Brauch added the comment:

While writing tests, I noticed that the additional fields (lineno, col_offset 
for vararg, kwarg, and other arguments) currently are mandatory. Is that a 
problem?
It doesn't seem trivial to change that, since apparently only attributes (not 
fields) can be optional, but those are not allowed by the syntax of python.asdl 
at this point.
In case the fields need to be mandatory, what would be the correct approach to 
achieve that?

Thanks.

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<http://bugs.python.org/issue16795>
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