{"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"let"}]}
                    let a_lane = fx.bcx.ins().uextend(lane_ty.double_width().unwrap(), a_lane);
                    let lane_ty = fx.bcx.func.dfg.value_type(a_lane);
                    let b_lane = fx.bcx.ins().uextend(lane_ty.double_width().unwrap(), b_lane);