Serhiy Storchaka added the comment:

Yes, I mean the "k + 1" with k=NULL.

Even if _PyEval_EvalCodeWithName() ignores that value, this still is an 
undefined behavior. For example the compiler can decide that since NULL+1 is 
not valid, then k never is NULL, and ignore the branch that sets k to NULL. It 
can also not generate the code in _PyEval_EvalCodeWithName() for handling the 
case kwcount == 0.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30640>
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