[issue22448] call_at/call_later with Timer cancellation can result in (practically) unbounded memory usage.

[Guido van Rossum]

Guido van Rossum added the comment:

I will try to review later tonight. One thing though:

>  I tend to write my code with the thought that any non standard library
function can yield

That makes sense when using geven, but not when using asyncio or Trollius.
Nothing will make events run if you don't use yield [from].

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<http://bugs.python.org/issue22448>
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