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Kernel died on recursive iterator #635
Description
The following minimal example results in a ValueError when executed directly
from itertools import pairwise
def g():
yield next(it)
it = pairwise(g())
next(it)
(e.g. run python example.py, which example.py containing the code above)
When running the same code in a qtconsole (or a Spyder cell) I get
The kernel died, restarting...
(or in spyder)
Exception ignored in: <generator object g at 0x000001F52B734940>
Traceback (most recent call last):
File "C:\Users\eendebakpt\AppData\Local\Temp\ipykernel_7984\1968913502.py", line 4, in g
ValueError: generator already executing
The kernel died, restarting...
The code is obviously not very sensible to run, but still the kernel should not restart.
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