[issue14657] Avoid two importlib copies

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

My preference would also be for _frozen_importlib._bootstrap to overwrite as much evidence of itself as it can with the "real" one.

This would also mean that changes to importlib._bootstrap would actually take effect for user code almost immediately, *without* rebuilding Python, as the frozen version would *only* be used to get hold of the pure Python version.

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<http://bugs.python.org/issue14657>
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