{"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
                let zero_lane = fx.bcx.ins().bitcast(mask_lane_clif_ty, MemFlags::new(), zero_lane);
                let zero_lane = fx.bcx.ins().iconst(mask_lane_clif_ty.as_int(), 0);
                ret.place_lane(fx, lane_idx)