Nick Coghlan added the comment:
I couldn't reproduce this on 3.7, but I can confirm that 3.6 gives a
SystemError with the above code:
$ ./python _issue30626.py
Traceback (most recent call last):
File "_issue30626.py", line 30, in <module>
exec("open(__file__)",dct)
File "<string>", line 1, in <module>
SystemError: <class '_io.TextIOWrapper'> returned NULL without setting an error
It's plausible this was fixed as part of the interpreter startup refactoring,
so I doubt we're going to able to easily isolate the specific change that fixed
it :(
----------
stage: -> needs patch
versions: +Python 3.6
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<http://bugs.python.org/issue30626>
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