import perf

async def corofn():
    pass

def benchmark():
    try:
        corofn().send(None)
    except StopIteration:
        pass
    try:
        corofn().send(None)
    except StopIteration:
        pass
    try:
        corofn().send(None)
    except StopIteration:
        pass
    try:
        corofn().send(None)
    except StopIteration:
        pass
    try:
        corofn().send(None)
    except StopIteration:
        pass
    try:
        corofn().send(None)
    except StopIteration:
        pass
    try:
        corofn().send(None)
    except StopIteration:
        pass
    try:
        corofn().send(None)
    except StopIteration:
        pass
    try:
        corofn().send(None)
    except StopIteration:
        pass
    try:
        corofn().send(None)
    except StopIteration:
        pass

runner = perf.Runner()
runner.bench_func("coroutine creation/close", benchmark)