Guido van Rossum <gu...@python.org> added the comment:

Well that's *always* a problem right? If you take that to the extreme we 
wouldn't need bugfix releases. :-)

Apart from some examples in the 3.5-3.6 timeframe, what makes you think that 
*this* fix *specifically* is going to make more people unhappy than it makes 
happy?

When people complain that they wrote Annotated[ClassVar[int], ...] and are 
disappointed that it doesn't work in a certain old version, you can just tell 
them to use ClassVar[Annotated[int, ...]] which is in no way invalid or 
inferior and works in all versions that support Annotated.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46491>
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