Diff from mypy_primer, showing the effect of this PR on open source code:

aiohttp (https://github.com/aio-libs/aiohttp)
+ aiohttp/worker.py:73:44: error: overload def (func: def (*Any, **Any) -> typing.Coroutine[Any, Any, Any]) -> builtins.bool of function asyncio.coroutines.iscoroutinefunction is deprecated: Use inspect.iscoroutinefunction instead  [deprecated]
+ aiohttp/worker.py:73:44: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-deprecated for more info  [deprecated]

If I understand it correctly, it's sometimes necessary to use this on Python < 3.11, since it supports @coroutine (removed in 3.11), which the inspect version doesn't support.

I'll close this in favor of @max-muoto 's #14289 . In which the tests are also already updated to keep testing both methods.

I'll close this in favor of @max-muoto 's #14289 . In which the tests are also already updated to keep testing both methods.