Brett Cannon added the comment:

I brought this topic up on python-ideas and both Nick Coghlan and MA Lemburg 
suggested the abc module like Yury did. So the proposal becomes to put 
syntax-related ABCs into the abc module and domain-specific ones in their 
respective stdlib modules.

Nick suggested the following ABCs get pulled out of collections.abc and put 
into the abc module:

    Callable - function calls
    Iterable - for loops, comprehensions
    Iterator - for loops, comprehensions
    Generator - generators, generator expressions
    Awaitable - await expressions
    Coroutine - async def
    AsyncIterable - async for
    AsyncIterator  - async for

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25637>
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