   LL|       |//@ edition: 2021
   LL|       |
   LL|       |use core::hint::black_box;
   LL|       |
   LL|       |#[derive(Debug, PartialEq)]
   LL|       |struct Foo(u32);
   LL|       |
   LL|      1|fn main() {
   LL|      1|    assert_ne!(
   LL|      1|        Foo(5), // Make sure this expression's span isn't lost.
   LL|      1|        if black_box(false) {
   LL|      0|            Foo(0) //
   LL|       |        } else {
   LL|      1|            Foo(1) //
   LL|       |        }
   LL|       |    );
   LL|      1|    ()
   LL|      1|}
   LL|       |
   LL|       |// This test is a short fragment extracted from `issue-84561.rs`, highlighting
   LL|       |// a particular span of code that can easily be lost if overlapping spans are
   LL|       |// processed incorrectly.