[issue3132] implement PEP 3118 struct changes

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Let's retarget it to 3.1 then. It's a new feature, not a behaviour
change or a deprecation, so adding it to 3.0 isn't a necessity.

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components: +Library (Lib)
nosy: +pitrou
priority: release blocker -> critical
versions: +Python 3.1 -Python 3.0

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