STINNER Victor added the comment:
I misunderstood the gdb traceback. Display a warning does not reload the io
module: in fact, the io module was unloaded and
PyImport_ImportModuleLevelObject() already raises an ImportError in this case:
ImportError("import of 'io' halted; None in sys.modules"). So nothing else need
to be done, I'm now closing the issue.
I created more specific issues about warnings, see issues #19442 and #19466.
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resolution: -> invalid
status: open -> closed
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<http://bugs.python.org/issue19421>
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