[issue21335] Update importlib.__init__ to reset _frozen_importlib's loader to SourceFileLoader

[Brett Cannon]

Brett Cannon added the comment:

Even with setting SourceFileLoader, you still don't get file lines back. Why? Because all of the constructed objects in _frozen_importlib have their co_filename set before the back-patching in importlib.__init__ and so when the traceback module tries to do its thing it sees '<frozen importlib._bootstrap>' as the filename instead of importlib._bootstrap.__file__ which doesn't lead to linecache getting anything useful.

IOW a whole lot of effort for code that people should never have to look at.

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resolution:  -> rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21335>
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