Error on using `yield` without also using `#[coroutine]` on the closure

And suggest adding the `#[coroutine]` to the closure

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/coverage/coroutine.rs b/tests/coverage/coroutine.rs
index 2aa689466fc..7f72e0d8bd4 100644
--- a/tests/coverage/coroutine.rs
+++ b/tests/coverage/coroutine.rs
@@ -1,4 +1,4 @@
-#![feature(coroutines, coroutine_trait)]
+#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
 
 use std::ops::{Coroutine, CoroutineState};
 use std::pin::Pin;
@@ -18,7 +18,7 @@ fn get_u32(val: bool) -> Result<u32, String> {
 
 fn main() {
     let is_true = std::env::args().len() == 1;
-    let mut coroutine = || {
+    let mut coroutine = #[coroutine] || {
         yield get_u32(is_true);
         return "foo";
     };