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bzrlib/upgrade.py
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        # to_read is a stack holding the revisions we still need to process;
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        # appending to it adds new highest-priority revisions
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        self.known_revisions = set(rev_history)
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        self.to_read = [rev_history[-1]]
 
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        self.to_read = rev_history[-1:]
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        while self.to_read:
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            rev_id = self.to_read.pop()
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            if (rev_id not in self.revisions