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Class decorator for installation on sys.meta_path.
Adds the backport DistributionFinder to sys.meta_path and
attempts to disable the finder functionality of the stdlib
DistributionFinder.
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Give the backport primacy for discovering path-based distributions
by monkey-patching the stdlib O_O.
See #91 for more background for rationale on this sketchy
behavior.
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A "Finder" (aka "MetaPathFinder") that never finds any modules,
but may find distributions.
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�� �r c �: � t j � dk( }| |z S )zY
Adjust for variable stacklevel on partial under PyPy.
Workaround for #327.
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