{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//"}]}
            // Find the first feature that provides at least this vector size.
        if uses_vector_registers(&arg_abi.mode, &arg_abi.layout.backend_repr) {
            let feature = match feature_def.iter().find(|(bits, _)| size.bits() <= *bits) {