[issue45704] string.Formatter.parse does not handle auto-numbered positional fields

[Sascha Desch]

Sascha Desch <sascha.desch at hotmail.com> added the comment:

Another thing that occurred to me is the question of what `.parse()` should do when a mix of auto-numbered and manually numbered fields is supplied e.g. `{}{1}`. As of now `.parse()` happily processes such inputs and some other piece of code deals with this and ultimately raises an exception that mixing manual with automatic numbering is not allowed. If `.parse()` supported automatic numbering it would have to be aware of this too I guess?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45704>
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