Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Made a warning for '[' be emitted only at the start of a set. This 
significantly decrease the breakage of other code. I think we can get around 
without implicit union of nested sets, like in [_[0-9][:Latin:]]. This can be 
written as [_||[0-9]||[:Latin:]].

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue30349>
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