mercurial/phases.py

19980:0151b61fed97

        # phasecache to avoid reference cycles. The changelog instance
        # is not stored because it is a filecache() property and can
        # be replaced without us being notified.
        if rev == nullrev:
            return public
        if self._phaserevs is None or rev >= len(self._phaserevs):
            self._phaserevs = self.getphaserevs(repo, rebuild=True)
        return self._phaserevs[rev]

    def write(self):

19984:7d5e7799a29f

        # phasecache to avoid reference cycles. The changelog instance
        # is not stored because it is a filecache() property and can
        # be replaced without us being notified.
        if rev == nullrev:
            return public
        if rev < nullrev:
            raise ValueError(_('cannot lookup negative revision'))
        if self._phaserevs is None or rev >= len(self._phaserevs):
            self._phaserevs = self.getphaserevs(repo, rebuild=True)
        return self._phaserevs[rev]

    def write(self):