[code-quality] [feature request] Unused variable warning for "except Exception as e"

[Shane Creighton-Young]

Hello flake8!

I would have expected pyflakes to emit an unused variables warning for "e"
on the following code snippet:

class ModuleError(Exception):
    pass

try:
    1 / 0
except ZeroDivisionError as e:
    raise ModuleError()

Curious if this check can be added.

Thank you!

--
Shane Creighton-Young
shane at goubiq.com
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