[issue23571] Raise SystemError if a function returns a result with an exception set

[STINNER Victor]

STINNER Victor added the comment:

Le 21 mars 2015 18:05, "Serhiy Storchaka" <report at bugs.python.org> a écrit :
> But an assertion itself provides less information than an exception.
Debug build is less informative than release build.

I like Antoine's idea to replace the assertion with Py_FatalError() in
debug mode.

I'm more concerned by bugs in Python itself. A fatal error/assertion should
be noticed quickly on buildbots which compile python in debug mode.

It's just fine if other people use the release mode and get an exception.

> May be add a runtime flag to control the reaction on system errors? If it
set, all raised SystemError will be converted to fatal errors.

It's already what I do when running Python test suite with pyfailmalloc. I
modify manually SystemError constructor in the C code. A flag may help, but
you have to know that many tests expect SystemError (I don't remember which
ones).

Victor

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