tests/coverage/async_block.coverage

   LL|       |#![feature(coverage_attribute)]
   LL|       |//@ edition: 2021
   LL|       |
   LL|       |//@ aux-build: executor.rs
   LL|       |extern crate executor;
   LL|       |
   LL|      1|fn main() {
   LL|     17|    for i in 0..16 {
                      ^16
   LL|     16|        let future = async {
   LL|     16|            if i >= 12 {
   LL|      4|                println!("big");
   LL|     12|            } else {
   LL|     12|                println!("small");
   LL|     12|            }
   LL|     16|        };
   LL|     16|        executor::block_on(future);
   LL|       |    }
   LL|      1|}