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__test__ = False
if __name__ == '__main__':
import warnings
from eventlet import tpool
g = [False]
def do():
g[0] = True
with warnings.catch_warnings(record=True) as ws:
warnings.simplefilter('always', category=RuntimeWarning)
tpool.execute(do)
msgs = [str(w) for w in ws]
assert len(ws) == 1, msgs
msg = str(ws[0].message)
assert 'Zero threads in tpool' in msg
assert 'EVENTLET_THREADPOOL_SIZE' in msg
assert g[0]
print('pass')
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