Nothing preventing an async on_update function being used when cothread is the dispatcher

[AlexanderWells-diamond]

There's currently no ahead-of-time warning/error that passing an async function to on_update/on_update_name is invalid. If you do it, you'll get an error message like this when you update the record:

 /scratch/eyh46967/pipenv/pythonSoftIOC-RPmM1Zwv/lib/python3.7/site-packages/cothread/cothread.py:971: RuntimeWarning: coroutine 'ProcessDeviceSupportOut._complete_update' was never awaited
  action(*args)
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
/scratch/eyh46967/pipenv/pythonSoftIOC-RPmM1Zwv/lib/python3.7/site-packages/cothread/cothread.py:976: RuntimeWarning: coroutine 'my_sleep' was never awaited
  action = args = None
RuntimeWarning: Enable tracemalloc to get the object allocation traceback

This would not be trivial to check - the dispatcher is only defined during iocInit(), which is after all records have been created and given their callback. So it may not be worth stopping this misconfiguration?

[Araneidae]

Really don't think this is worth worrying about!