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Add MemoryTree.last_revision.

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bzrlib/workingtree.py
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    @needs_read_lock
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    def last_revision(self):
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        """Return the last revision id of this working tree.
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        In early branch formats this was == the branch last_revision,
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        but that cannot be relied upon - for working tree operations,
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        always use tree.last_revision().
 
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        """Return the last revision of the branch for this tree.
 
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        This format tree does not support a separate marker for last-revision
 
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        compared to the branch.
 
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        See MutableTree.last_revision
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        """
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        return self.branch.last_revision()
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    @needs_read_lock
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    def last_revision(self):
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        """See WorkingTree.last_revision."""
 
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        """See Mutable.last_revision."""
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        try:
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            return self._control_files.get_utf8('last-revision').read()
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        except NoSuchFile: