STINNER Victor added the comment:

> Nice work, my issue21385 is also related. Basically, transforming non-Python 
> code into Python meant that all line number information, which otherwise 
> would have been useful for debugging, had to be discarded, or debug builds of 
> Python would dump cores.

Ok, it looks like there are multiple use cases for negative line numbers, and 
the change doesn't really break anything in practice. I tried to explain 
exactly who is impacted and how to update the code in the Porting section of 
What's New in Python 3.6.

For each review Serhiy. I pushed the the change to Python 3.6.

----------
resolution:  -> fixed
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26107>
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