micropython/tests/extmod/uasyncio_cancel_self.py

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# Test a task cancelling itself (currently unsupported)
try:
import uasyncio as asyncio
except ImportError:
try:
import asyncio
except ImportError:
print("SKIP")
raise SystemExit
async def task():
print("task start")
global_task.cancel()
async def main():
global global_task
global_task = asyncio.create_task(task())
try:
await global_task
except asyncio.CancelledError:
print("main cancel")
print("main done")
try:
asyncio.run(main())
except RuntimeError as er:
print(er)