John Belmonte <[email protected]> added the comment:
To clarify the problem case, I believe the discrepancy is seen when raising
exceptions as follows:
exc = foo()
try:
raise exc
finally:
exc.__context__ = None
(From my understanding, Trio has valid use cases for doing this since it wants
to control complex exception chaining, and this is beyond the scope of
__suppress_context__.)
Neither ExitStack nor AsyncExcitStack are preserving the None context in the
case above.
=== `with` statement ===
Traceback (most recent call last):
File "exit_stack_test.py", line 251, in <module>
assert False
File "/.../python3.7/contextlib.py", line 130, in __exit__
self.gen.throw(type, value, traceback)
File "exit_stack_test.py", line 244, in my_cm
raise exc
MyException
=== enter_context() ===
Traceback (most recent call last):
File "exit_stack_test.py", line 240, in my_cm
yield
File "exit_stack_test.py", line 259, in <module>
assert False
AssertionError
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "exit_stack_test.py", line 259, in <module>
assert False
File "/.../python3.7/contextlib.py", line 524, in __exit__
raise exc_details[1]
File "/.../python3.7/contextlib.py", line 509, in __exit__
if cb(*exc_details):
File "/.../python3.7/contextlib.py", line 377, in _exit_wrapper
return cm_exit(cm, exc_type, exc, tb)
File "/.../python3.7/contextlib.py", line 130, in __exit__
self.gen.throw(type, value, traceback)
File "exit_stack_test.py", line 244, in my_cm
raise exc
MyException
----------
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Python tracker <[email protected]>
<https://bugs.python.org/issue44594>
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