Yury Selivanov added the comment:
I think this is a backwards incompatible change and thus will be rejected.
Currently there's a guarantee that "wait_for" can throw a TimeoutError *only*
when when you await it.
fut = wait_for(something, 0)
# some important code
try:
await fut
except TimeoutError:
# do something
With your PR merged, the above asyncio code would be broken, because asyncio
users can guard with try..except only the await expression.
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<https://bugs.python.org/issue31556>
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