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: v8.rs
    path of file: ./repos/nextest/fixtures/nextest-tests/vendor/uuid/src
    
    the code of the file until where you have to start completion: use crate::{Builder, Uuid};

impl Uuid {
    /// Creates a custom UUID comprised almost entirely of user-supplied bytes.
    ///
    /// This will inject the UUID Version at 4 bits starting at the 48th bit
    /// and the Variant into 2 bits 64th bit. Any existing bits in the user-supplied bytes
    /// at those locations will be overridden.
    ///
    /// Note that usage of 
    
    fn test_new() {
        let buf: [u8; 16] = [
            0xf, 0xe, 0xd, 0xc, 0xb, 0xa, 0x9, 0x8, 0x7, 0x6, 0x5, 0x4, 0x3, 0x2, 0x1, 0x0,
        ];
        let uuid = Uuid::new_v8(buf);
        assert_eq!(uuid.get_version(), Some(Version::Custom));
        assert_eq!(uuid.get_variant(), Variant::RFC4122);
        assert_eq!(uuid.get_version_num(), 8);
        assert_eq!(
            uuid.hyphenated().to_string(),
            "0f0e0d0c-0b0a-8908-8706-050403020100"
        );
    }