LL|       |#![feature(coverage_attribute)]
   LL|       |//@ edition: 2024
   LL|       |//@ revisions: base auto on
   LL|       |
   LL|       |// Tests for how `#[automatically_derived]` affects coverage instrumentation.
   LL|       |//
   LL|       |// The actual behaviour is an implementation detail, so this test mostly exists
   LL|       |// to show when that behaviour has been accidentally or deliberately changed.
   LL|       |//
   LL|       |// Revision guide:
   LL|       |// - base: Test baseline instrumentation behaviour without `#[automatically_derived]`
   LL|       |// - auto: Test how `#[automatically_derived]` affects instrumentation
   LL|       |// - on:   Test interaction between auto-derived and `#[coverage(on)]`
   LL|       |
   LL|       |struct MyStruct;
   LL|       |
   LL|       |trait MyTrait {
   LL|       |    fn my_assoc_fn();
   LL|       |}
   LL|       |
   LL|       |#[cfg_attr(auto, automatically_derived)]
   LL|       |#[cfg_attr(on, automatically_derived)]
   LL|       |#[cfg_attr(on, coverage(on))]
   LL|       |impl MyTrait for MyStruct {
   LL|      1|    fn my_assoc_fn() {
   LL|      1|        fn inner_fn() {
   LL|      1|            say("in inner fn");
   LL|      1|        }
   LL|       |
   LL|       |        #[coverage(on)]
   LL|      1|        fn inner_fn_on() {
   LL|      1|            say("in inner fn (on)");
   LL|      1|        }
   LL|       |
   LL|      1|        let closure = || {
   LL|      1|            say("in closure");
   LL|      1|        };
   LL|       |
   LL|      1|        closure();
   LL|      1|        inner_fn();
   LL|      1|        inner_fn_on();
   LL|      1|    }
   LL|       |}
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |#[inline(never)]
   LL|       |fn say(s: &str) {
   LL|       |    println!("{s}");
   LL|       |}
   LL|       |
   LL|      1|fn main() {
   LL|      1|    MyStruct::my_assoc_fn();
   LL|      1|}