bpo-32591: _PyErr_WarnUnawaitedCoroutine() sets source #19247
Merged
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The _PyErr_WarnUnawaitedCoroutine() fallback now also sets the
coroutine object as the source of the warning, as done by the Python
implementation warnings._warn_unawaited_coroutine().
Moreover, don't truncate the coroutine name: Python supports
arbitrary string length to format the message.
https://bugs.python.org/issue32591