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The asyncio docs currently document the event loop interface as belonging to BaseEventLoop. But the intention of PEP 3156 was for the interface to belong to AbstractEventLoop. In typeshed we ended up exporting only AbstractEventLoop, but this runs into trouble when type-checking code written against the asyncio docs in the CPython repo rather against the PEP.
Unless there's a serious objection I would like to see the docs changed to match the PEP here, and switch from BaseEventLoop to AbstractEventLoop.
Thoughts?

Cross-reference: this came up in https://github.com/python/typeshed/issues/452 

I think we should fix this. BaseEventLoop is just an implementation detail of asyncio (I think we shouldn't have exposed it in asyncio.__all__ at all).

Here's a tentative diff. I did a global replace BaseEventLoop -> AbstractEventLoop and added an entry for BaseEventLoop (just above AbstractEventLoop) explaining that it should not be used. Please review for obvious mistakes.

The patch looks good.
I have a question: do we actually want to document BaseEventLoop? It's not a user-facing class, and the knowledge that it exists doesn't add to anything IMO.

The reason I kept some mention of BaseEventLoop is just that until now it
was the only thing documented and people might have references to it. It
would be good if searching for BaseEventLoop took them to a section
explaining they shouldn't use it, rather than just mysteriously failing to
turn up any search results at all.
And given that it *is* the base class I think we can't mark it as
deprecated (and I don't think that's needed yet).

Fair enough. I don't have any other questions about the patch.

New changeset 87e3a58ed3c3 by Guido van Rossum in branch '3.5':
Issue #27700: Document AbstractEventLoop, not BaseEventLoop.
https://hg.python.org/cpython/rev/87e3a58ed3c3
New changeset d69f782d642d by Guido van Rossum in branch 'default':
Issue #27700: Document AbstractEventLoop, not BaseEventLoop. (Merge 3.5->3.6)
https://hg.python.org/cpython/rev/d69f782d642d