fail tests if inner attrs are eaten

Author: hawkw

tracing-attributes/tests/async_fn.rs

@@ -32,6 +32,9 @@ async fn test_ret_impl_trait_err(n: i32) -> Result<impl Iterator<Item = i32>, &'
 #[instrument]
 async fn test_async_fn_empty() {}
 
+// Reproduces a compile error when an instrumented function body contains inner
+// attributes (https://github.com/tokio-rs/tracing/issues/2294).
+#[deny(unused_variables)]
 #[instrument]
 async fn repro_async_2294() {
     #![allow(unused_variables)]

tracing-attributes/tests/instrument.rs

@@ -3,6 +3,9 @@ use tracing::Level;
 use tracing_attributes::instrument;
 use tracing_mock::*;
 
+// Reproduces a compile error when an instrumented function body contains inner
+// attributes (https://github.com/tokio-rs/tracing/issues/2294).
+#[deny(unused_variables)]
 #[instrument]
 fn repro_2294() {
     #![allow(unused_variables)]