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Implement Tree.annotate_iter for RevisionTree and WorkingTree

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bzrlib/tree.py
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    def get_file_by_path(self, path):
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        return self.get_file(self._inventory.path2id(path))
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    def annotate_iter(self, file_id):
 
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        """Return an iterator of revision_id, line tuples 
 
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        For working trees (and mutable trees in general), the special
 
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        revision_id 'current:' will be used for lines that are new in this
 
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        tree, e.g. uncommitted changes.
 
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        :param file_id: The file to produce an annotated version from
 
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        """
 
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        raise NotImplementedError(self.annotate_iter)
 
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    inventory = property(_get_inventory,
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                         doc="Inventory of this Tree")
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