{"ast_node_type":"variable","tokens":[{"end":30,"kind":"keyword","start":0,"text":"let"}]}
                let res_lane =
                let m_lane = fx.bcx.ins().icmp_imm(IntCC::Equal, m_lane, 0);
                    CValue::by_val(fx.bcx.ins().select(m_lane, b_lane, a_lane), lane_layout);