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def report_extension_load_failures():
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if not _extension_load_failures:
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# the warnings framework should by default show this only once
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from .trace import warning
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"brz: warning: some compiled extensions could not be loaded; "
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# we no longer show the specific missing extensions here, because it makes
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# the message too long and scary - see
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# https://bugs.launchpad.net/bzr/+bug/430529