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bzrlib/diff.py
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        return proc.wait()
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    def _try_symlink_root(self, tree, prefix):
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        if not (getattr(tree, 'abspath', None) is not None
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                and osutils.has_symlinks()):
 
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        if (getattr(tree, 'abspath', None) is None
 
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            or not osutils.host_os_dereferences_symlinks()):
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            return False
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        try:
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            os.symlink(tree.abspath(''), osutils.pathjoin(self._root, prefix))