[issue32012] Disallow ambiguous syntax f(x for x in [1],)

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

The syntax f(x for x in [1],) is ambiguous and reasons that allow it (omitting parenthesis in generator expression and using trailing comma in call expression) are not applicable in this case. Rationales see on Python-Dev: https://mail.python.org/pipermail/python-dev/2017-November/150481.html.

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components: Interpreter Core
messages: 306132
nosy: benjamin.peterson, brett.cannon, ncoghlan, serhiy.storchaka, yselivanov
priority: normal
severity: normal
status: open
title: Disallow ambiguous syntax f(x for x in [1],)
type: enhancement
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32012>
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