tests/coverage/macros/context-mismatch-issue-147339.coverage

   LL|       |//@ edition: 2024
   LL|       |
   LL|       |// These nested macro expansions were found to cause span refinement to produce
   LL|       |// spans with a context that doesn't match the function body span, triggering
   LL|       |// a defensive check that discards the span.
   LL|       |//
   LL|       |// Reported in <https://github.com/rust-lang/rust/issues/147339>.
   LL|       |
   LL|       |macro_rules! foo {
   LL|       |    ($($m:ident $($f:ident $v:tt)+),*) => {
   LL|       |        $($(macro_rules! $f { () => { $v } })+)*
   LL|      0|        $(macro_rules! $m { () => { $(fn $f() -> i32 { $v })+ } })*
  ------------------
  | Unexecuted instantiation: context_mismatch_issue_147339::a
  ------------------
  | Unexecuted instantiation: context_mismatch_issue_147339::b
  ------------------
  | Unexecuted instantiation: context_mismatch_issue_147339::c
  ------------------
   LL|       |    }
   LL|       |}
   LL|       |
   LL|       |foo!(m a 1 b 2, n c 3);
   LL|       |m!();
   LL|       |n!();
   LL|       |
   LL|      1|fn main() {}