You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: shared.rs
    path of file: ./repos/bottlerocket/sources/models/modeled-types/src
    
    the code of the file until where you have to start completion: use super::error;
use lazy_static::lazy_static;
use regex::Regex;
use scalar::traits::{Scalar, Validate};
use scalar::ValidationError;
use scalar_derive::S
    
    fn valid_sysctl_key() {
        for ok in &[
            // Longest real one
            "net/ipv4/conf/enp0s42f3/igmpv3_unsolicited_report_interval",
            // Dots or slashes OK
            "net.ipv4.conf.enp0s42f3.igmpv3_unsolicited_report_interval",
            // Mixed dots/slashes isn't supported by sysctl(8), but it's unambiguous
            "net/ipv4.conf.enp0s42f3/igmpv3_unsolicited_report_interval",
            // Shortest real one
            "fs/aio-nr",
            // Shortest allowed
            "a",
            // Longest allowed
            &"a".repeat(128),
            // All allowed characters
            "-./0123456789_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",
        ] {
            SysctlKey::try_from(*ok).unwrap();
        }
    }