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: lib.rs
    path of file: ./repos/criterion.rs/bencher_compat/src
    
    the code of the file until where you have to start completion: extern crate criterion;

pub use criterion::Criterion;
pub use criterion::black_box;
use criterion::measurement::WallTime;

/// Stand-in for `bencher::Bencher` which uses Criterion.rs to perform the benchmark instead.
pub struct Bencher<'a, 'b> {
    pub bytes: u64,
    pub bencher: &'a mut ::criterion::Bencher<'b, WallTime>,
}
impl<'a, 'b> Bencher<'a, 'b> {
    /// Callback for benchma
    
        pub fn $group_name() {
            use $crate::Criterion;
            let mut criterion: Criterion = Criterion::default().configure_from_args();

            $(
                criterion.bench_function(stringify!($function), |b| {
                    let mut wrapped = $crate::Bencher {
                        bytes: 0,
                        bencher: b,
                    };

                    $function(&mut wrapped);
                });
            )+
        }