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: benchmark.rs
    path of file: ./repos/rustls/ci-bench/src
    
    the code of the file until where you have to start completion: use std::sync::Arc;

use fxhash::{FxHashMap, FxHashSet};
use itertools::Itertools;

use crate::cachegrind::InstructionCounts;
use crate::util::KeyType;
use crate::Side;

/// Validates a benchmark collection, returning an error if the provided benchmarks are invalid
///
/// Benchmarks ca
    
pub fn validate_benchmarks(benchmarks: &[Benchmark]) -> anyhow::Result<()> {
    // Detect duplicate definitions
    let duplicate_names: Vec<_> = benchmarks
        .iter()
        .map(|b| b.name.as_str())
        .duplicates()
        .collect();
    if !duplicate_names.is_empty() {
        anyhow::bail!(
            "The following benchmarks are defined multiple times: {}",
            duplicate_names.join(", ")
        );
    }

    // Detect dangling benchmark references
    let all_names: FxHashSet<_> = benchmarks
        .iter()
        .map(|b| b.name.as_str())
        .collect();
    let referenced_names: FxHashSet<_> = benchmarks
        .iter()
        .flat_map(|b| match &b.reporting_mode {
            ReportingMode::AllInstructions => None,
            ReportingMode::AllInstructionsExceptSetup(name) => Some(name.as_str()),
        })
        .collect();

    let undefined_names: Vec<_> = referenced_names
        .difference(&all_names)
        .cloned()
        .collect();
    if !undefined_names.is_empty() {
        anyhow::bail!("The following benchmark names are referenced, but have no corresponding benchmarks: {}",
            undefined_names.join(", "));
    }

    Ok(())
}