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bzrlib/intset.py
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        if not self._val & m:
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            raise KeyError(to_remove)
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        self._val ^= m
 
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    def set_remove(self, to_remove):
 
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        """Remove all values that exist in to_remove.
 
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        >>> a = IntSet(range(10))
 
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        >>> b = IntSet([2,3,4,7,12])
 
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        >>> a.set_remove(b)
 
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        >>> list(a)
 
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        [0, 1, 5, 6, 8, 9]
 
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        >>> a.set_remove([1,2,5])
 
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        >>> list(a)
 
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        [0, 6, 8, 9]
 
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        """
 
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        if not isinstance(to_remove, IntSet):
 
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            self.set_remove(IntSet(to_remove))
 
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            return
 
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        intersect = self._val & to_remove._val
 
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        self._val ^= intersect
 
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