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: normalize.rs
    path of file: ./repos/firecracker/src/vmm/src/cpu_config/x86_64/cpuid/intel
    
    the code of the file until where you have to start completion: // Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

use crate::cpu_config::x86_64::cpuid::normalize::{
    get_range, set_bit, set_range, CheckedAssignError,
};
use crate::cpu_config::x86_64::cpuid::{
    host_brand_string, CpuidKey, CpuidRegisters, CpuidTrait, MissingBrandStringLeaves,
    BRAND_STRING_LENGTH,
};

/// Error type for [`super::IntelCpuid::normalize`].
#[derive(Debug, thiserror::Error, displaydoc::Display, Eq, PartialEq)]
pub enum NormalizeCpuidError {
    /// Failed to set deterministic cache leaf: {0}
    DeterministicCache(#[from] DeterministicCacheError),
    /// Leaf 0x6 is missing from CPUID.
    MissingLeaf6,
    /// Leaf 0x7 / subleaf 0 is missing from CPUID.
    M
    
    fn test_update_extended_feature_flags_entry() {
        let mut cpuid =
            crate::cpu_config::x86_64::cpuid::IntelCpuid(std::collections::BTreeMap::from([(
                crate::cpu_config::x86_64::cpuid::CpuidKey {
                    leaf: 0x7,
                    subleaf: 0,
                },
                crate::cpu_config::x86_64::cpuid::CpuidEntry {
                    flags: crate::cpu_config::x86_64::cpuid::KvmCpuidFlags::SIGNIFICANT_INDEX,
                    ..Default::default()
                },
            )]));

        cpuid.update_extended_feature_flags_entry().unwrap();

        let leaf_7_0 = cpuid
            .get(&crate::cpu_config::x86_64::cpuid::CpuidKey {
                leaf: 0x7,
                subleaf: 0,
            })
            .unwrap();
        assert!((leaf_7_0.result.ebx & (1 << 6)) > 0);
        assert!((leaf_7_0.result.ebx & (1 << 13)) > 0);
    }