LL|       |#![feature(coverage_attribute)]
   LL|       |//@ edition: 2021
   LL|       |
   LL|       |// Demonstrates the interaction of `#[coverage(off)]` and `#[coverage(on)]`
   LL|       |// in nested functions.
   LL|       |
   LL|       |// FIXME(#126625): Coverage attributes should apply recursively to nested functions.
   LL|       |// FIXME(#126626): When an inner (non-closure) function has `#[coverage(off)]`,
   LL|       |// its lines can still be marked with misleading execution counts from its enclosing
   LL|       |// function.
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |fn do_stuff() {}
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |fn dense_a() {
   LL|       |    dense_b();
   LL|       |    dense_b();
   LL|       |    #[coverage(on)]
   LL|      2|    fn dense_b() {
   LL|      2|        dense_c();
   LL|      2|        dense_c();
   LL|      2|        #[coverage(off)]
   LL|      2|        fn dense_c() {
   LL|      2|            do_stuff();
   LL|      2|        }
   LL|      2|    }
   LL|       |}
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |fn sparse_a() {
   LL|       |    sparse_b();
   LL|       |    sparse_b();
   LL|      2|    fn sparse_b() {
   LL|      2|        sparse_c();
   LL|      2|        sparse_c();
   LL|      2|        #[coverage(on)]
   LL|      4|        fn sparse_c() {
   LL|      4|            sparse_d();
   LL|      4|            sparse_d();
   LL|      8|            fn sparse_d() {
   LL|      8|                sparse_e();
   LL|      8|                sparse_e();
   LL|      8|                #[coverage(off)]
   LL|      8|                fn sparse_e() {
   LL|      8|                    do_stuff();
   LL|      8|                }
   LL|      8|            }
   LL|      4|        }
   LL|      2|    }
   LL|       |}
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |fn main() {
   LL|       |    dense_a();
   LL|       |    sparse_a();
   LL|       |}