{"ast_node_type":"variable","tokens":[{"end":99,"kind":"keyword","start":0,"text":"let"}]}
        let b_nan_mask = self.context.new_comparison(self.location, ComparisonOp::NotEquals, b, b);
        // b get compared & spliced together, we get the numeric values instead of NaNs.
        let mask_type = b_nan_mask.get_type();