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Merge from bzr.dev, resolving conflicts.

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        self._benchcalls = []
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        self._benchtime = None
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        # prevent hooks affecting tests
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        self._preserved_hooks = bzrlib.branch.Branch.hooks
 
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        self._preserved_hooks = {
 
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            bzrlib.branch.Branch:bzrlib.branch.Branch.hooks,
 
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            bzrlib.smart.server.SmartTCPServer:bzrlib.smart.server.SmartTCPServer.hooks,
 
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            }
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        self.addCleanup(self._restoreHooks)
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        # this list of hooks must be kept in sync with the defaults
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        # in branch.py
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            osutils.set_or_unset_env(name, value)
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    def _restoreHooks(self):
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        bzrlib.branch.Branch.hooks = self._preserved_hooks
 
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        for klass, hooks in self._preserved_hooks.items():
 
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            setattr(klass, 'hooks', hooks)
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    def knownFailure(self, reason):
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        """This test has failed for some known reason."""