{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
        let supported_tys = reg_class.supported_types(asm_arch, allow_experimental_reg);
        let reg_class = reg.reg_class();
        let Some((_, feature)) = supported_tys.iter().find(|&&(t, _)| t == asm_ty) else {