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Merge lp:bzr.

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bzrlib/decorators.py
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def only_raises(*errors):
 
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    """Make a decorator that will only allow the given error classes to be
 
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    raised.  All other errors will be logged and then discarded.
 
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    Typical use is something like::
 
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        @only_raises(LockNotHeld, LockBroken)
 
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        def unlock(self):
 
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            # etc
 
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    """
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    def decorator(unbound):
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        def wrapped(*args, **kwargs):
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            try: