[issue13585] Add contextlib.CallbackStack

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I'm unlikely to add the contextlib2.ContextStack API as written. I aim to have an updated variant (called contextlib.CallbackStack) available for alpha 3 in May:
https://bitbucket.org/ncoghlan/contextlib2/issue/8/rename-contextstack-to-callbackstack-and

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title: Add contextlib.ContextStack -> Add contextlib.CallbackStack

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