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raise NotImplementedError(self.open_repository)
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def open_workingtree(self, _unsupported=False,
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"""Open the workingtree object at this BzrDir if one is present.
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:param recommend_upgrade: Optional keyword parameter, when True (the
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default), emit through the ui module a recommendation that the user
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upgrade the working tree when the workingtree being opened is old
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(but still fully supported).
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raise NotImplementedError(self.open_workingtree)