[issue4613] Can't figure out where SyntaxError: can not delete variable 'x' referenced in nested scope us coming from in python shows no traceback

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

I think I understand. This simple code does not compile with python 3.0:

def f():
    e = None
    def g():
        e

    try:
        pass
    except Exception as e:
        pass # SyntaxError here???

The reason is that since 3.0, a "del e" statement is generated by the
compiler (see http://www.python.org/dev/peps/pep-3110/#semantic-changes)
and this conflicts with the first block of the function.

This issue is much more complicated than it seemed...
A solution could be to generate "e=None" instead of "del e".

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priority:  -> critical

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