[issue40627] Bus error on 'except E as a.b:'

[Guido van Rossum]

New submission from Guido van Rossum <guido at python.org>:

This seems due to some new check in pegen:

>>> try:
...   pass
... except E as a.b:
...   pass
... 
Bus error: 10

----------
messages: 368860
nosy: gvanrossum, lys.nikolaou, pablogsal
priority: normal
severity: normal
stage: needs patch
status: open
title: Bus error on 'except E as a.b:'
type: crash

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40627>
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