Larry Hastings added the comment:

Sigh.  If dataflow analysis could inline the static _impl function, it would 
notice that there are no code paths where the variable is uninitialized and 
gets used.  But I'm not surprised compilers aren't that sophisticated.

So I beat the problem to death with a shoe: now, variables that are in option 
groups that don't otherwise have a default value always get one.

----------
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19474>
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