[issue33305] Improve syntax error for numbers with leading zero

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

It still can cause when copy octal constants from other languages or from old Python 2 books and articles.

Perhaps it should emit SyntaxWarning if all digits are in range 0-7 and the number is larger than 7.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue33305>
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