Port, board and/or hardware

Unix build (also verified on RP2 2)

MicroPython version

MicroPython v1.24.1 on 2024-11-29; Raspberry Pi Pico2 with RP2350

Reproduction

Paste the following at the REPL

import asyncio

evt = asyncio.Event()
async def foo():
    data = [1,2,3]
    for d in data:
        print(d)
        await asyncio.sleep(1)
    await evt.wait()  # Should hang

async def main():
    await foo()

asyncio.run(main())

Expected behaviour

Should print 1, 2, 3 then hang. This happens under CPython 3.10.12

1
2
3

Observed behaviour

Under MP, after expected output, it returns to the REPL.

1
2
3
>>> 

Additional Information

This may be related to #16318

I am encountering the phenomenon of premature return in a number of situations, notably in test scripts where there are no pending tasks. I have never observed it in applications where there are multiple concurrent tasks.

Code of Conduct

Yes, I agree