[docs] [issue22942] Language Reference - optional comma

[Martin Panter]

Martin Panter added the comment:

Issue 28978 covers the parameter list syntax (Bug 1 + plus another problem).

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dependencies: +a redundant right  parentheses in the EBNF rules of parameter_list

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22942>
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