LL|       |#![feature(coverage_attribute)]
   LL|       |//@ edition: 2024
   LL|       |
   LL|       |// Test that when a macro expands to another macro, without any significant
   LL|       |// spans of its own, that this doesn't cause coverage instrumentation to give
   LL|       |// up and ignore the inner spans.
   LL|       |
   LL|       |macro_rules! inner_macro {
   LL|       |    () => {
   LL|       |        if core::hint::black_box(true) {
   LL|       |            say("true");
   LL|       |        } else {
   LL|       |            say("false");
   LL|       |        }
   LL|       |    };
   LL|       |}
   LL|       |
   LL|       |macro_rules! middle_macro {
   LL|       |    () => {
   LL|       |        inner_macro!()
   LL|       |    };
   LL|       |}
   LL|       |
   LL|       |macro_rules! outer_macro {
   LL|       |    () => {
   LL|       |        middle_macro!()
   LL|       |    };
   LL|       |}
   LL|       |
   LL|       |// In each of these three functions, the macro call should be instrumented,
   LL|       |// and should have an execution count of 1.
   LL|       |//
   LL|       |// Each function contains some extra code to ensure that control flow is
   LL|       |// non-trivial.
   LL|       |
   LL|      1|fn uses_inner_macro() {
   LL|      1|    if core::hint::black_box(true) {
   LL|      1|        say("before inner_macro");
   LL|      1|        inner_macro!();
   LL|      1|        say("after inner_macro");
   LL|      0|    }
   LL|      1|}
   LL|       |
   LL|      1|fn uses_middle_macro() {
   LL|      1|    if core::hint::black_box(true) {
   LL|      1|        say("before middle_macro");
   LL|      1|        middle_macro!();
   LL|      1|        say("after middle_macro")
   LL|      0|    }
   LL|      1|}
   LL|       |
   LL|      1|fn uses_outer_macro() {
   LL|      1|    if core::hint::black_box(true) {
   LL|      1|        say("before outer_macro");
   LL|      1|        outer_macro!();
   LL|      1|        say("after outer_macro");
   LL|      0|    }
   LL|      1|}
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |fn main() {
   LL|       |    uses_inner_macro();
   LL|       |    uses_middle_macro();
   LL|       |    uses_outer_macro();
   LL|       |}
   LL|       |
   LL|       |#[coverage(off)]
   LL|       |fn say(message: &str) {
   LL|       |    println!("{message}");
   LL|       |}