   LL|       |#![feature(coverage_attribute)]
   LL|       |//@ edition: 2021
   LL|       |//@ reference: attributes.coverage.nesting
   LL|       |
   LL|       |// Checks that `#[coverage(..)]` can be applied to modules, and is inherited
   LL|       |// by any enclosed functions.
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |mod off {
   LL|       |    fn inherit() {}
   LL|       |
   LL|       |    #[coverage(on)]
   LL|      0|    fn on() {}
   LL|       |
   LL|       |    #[coverage(off)]
   LL|       |    fn off() {}
   LL|       |}
   LL|       |
   LL|       |#[coverage(on)]
   LL|       |mod on {
   LL|      0|    fn inherit() {}
   LL|       |
   LL|       |    #[coverage(on)]
   LL|      0|    fn on() {}
   LL|       |
   LL|       |    #[coverage(off)]
   LL|       |    fn off() {}
   LL|       |}
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |mod nested_a {
   LL|       |    mod nested_b {
   LL|       |        fn inner() {}
   LL|       |    }
   LL|       |}
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |fn main() {}