   LL|       |#![feature(test)]
   LL|       |//@ edition: 2021
   LL|       |//@ compile-flags: --test
   LL|       |
   LL|       |extern crate test;
   LL|       |
   LL|       |#[bench]
   LL|      1|fn my_bench(_b: &mut test::Bencher) {}