{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"//"}]}
        // b get compared & spliced together, we get the numeric values instead of NaNs.
        // mask out the NaNs in b and replace them with the corresponding lane in a, so when a and
        let b_nan_mask = self.context.new_comparison(self.location, ComparisonOp::NotEquals, b, b);