[issue25609] Add a ContextManager ABC and type

[Brett Cannon]

Brett Cannon added the comment:

Here is an initial patch to add AbstractContextManager and ContextManagerType to contextlib. There are no tests yet as I want to make sure this looks okay first.

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keywords: +patch
stage: needs patch -> patch review
Added file: http://bugs.python.org/file42209/contextmanagertype.diff

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