g1 about to yield from g2
Traceback (most recent call last):
  File "test18.py", line 14, in <module>
    next(gi)
  File "test18.py", line 7, in g1
    yield from g2()
  File "test18.py", line 11, in g2
    yield 1/0
ZeroDivisionError: int division or modulo by zero