def visit_BoolOp(self, node):
        """ Merge right and left operands ranges.

        TODO : We could exclude some operand with this range information...

        >>> import gast as ast
        >>> from pythran import passmanager, backend
        >>> node = ast.parse('''
        ... def foo():
        ...     a = 2
        ...     c = 3
        ...     d = a or c''')
        >>> pm = passmanager.PassManager("test")
        >>> res = pm.gather(RangeValues, node)
        >>> res['d']
        Interval(low=2, high=3)
        """
        res = list(zip(*[self.visit(elt).bounds() for elt in node.values]))
        return self.add(node, Interval(min(res[0]), max(res[1])))
Merge right and left operands ranges.

        TODO : We could exclude some operand with this range information...

        >>> import gast as ast
        >>> from pythran import passmanager, backend
        >>> node = ast.parse('''
        ... def foo():
        ...     a = 2
        ...     c = 3
        ...     d = a or c''')
        >>> pm = passmanager.PassManager("test")
        >>> res = pm.gather(RangeValues, node)
        >>> res['d']
        Interval(low=2, high=3)