import subprocess
import sys

test_code = '''
import asyncio


class NonTrueAwaitable:
    def __init__(self, inner):
        self.inner = inner

    def __bool__(self) -> bool:
        return False

    def __await__(self):
        val = yield from self.inner
        return val


async def run():
    async def inner():
        return 42
    return await NonTrueAwaitable(inner())


print(asyncio.get_event_loop().run_until_complete(run()))
'''

try:
    subprocess.check_call([sys.executable, '-c', test_code], env={})
except:
    print('failed without PYTHONASYNCIODEBUG')
else:
    print('works without PYTHONASYNCIODEBUG')
try:
    subprocess.check_call([sys.executable, '-c', test_code], env={'PYTHONASYNCIODEBUG': '1'})
except:
    print('failed with PYTHONASYNCIODEBUG')
else:
    print('works with PYTHONASYNCIODEBUG')