[issue27494] 2to3 parser failure caused by a comma after a generator expression

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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type: crash -> behavior
versions: +Python 3.8 -Python 2.7, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27494>
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