Guido van Rossum <[email protected]> added the comment:
I like the lookahead. We could also make the comma and the message mandatory
when inside parentheses:
| 'assert' '(' a=expression ',' b=expression [','] ')' &(NEWLINE | ';')
| 'assert' a=expression b=[',' z=expression { z }]
(And probably add an "invalid" rule to cover tuples with 0, 1, 3 or more
elements.)
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<https://bugs.python.org/issue46167>
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