{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
        let a_cast = self.context.new_bitcast(self.location, a, mask_type);
            self.context.new_unary_op(self.location, UnaryOp::BitwiseNegate, mask_type, b_nan_mask);
        let b_cast = self.context.new_bitcast(self.location, b, mask_type);