diff --git a/library/core/src/ops/coroutine.rs b/library/core/src/ops/coroutine.rs
index 13df888d24c5c..c7d596d74c383 100644
--- a/library/core/src/ops/coroutine.rs
+++ b/library/core/src/ops/coroutine.rs
@@ -69,6 +69,7 @@ pub enum CoroutineState<Y, R> {
 #[lang = "coroutine"]
 #[unstable(feature = "coroutine_trait", issue = "43122")]
 #[fundamental]
+#[must_use = "coroutines are lazy and do nothing unless resumed"]
 pub trait Coroutine<R = ()> {
     /// The type of value this coroutine yields.
     ///
diff --git a/tests/ui/coroutine/issue-58888.rs b/tests/ui/coroutine/issue-58888.rs
index 6266f97ce8c46..e4fada0cd432e 100644
--- a/tests/ui/coroutine/issue-58888.rs
+++ b/tests/ui/coroutine/issue-58888.rs
@@ -13,7 +13,8 @@ impl Database {
     }
 
     fn check_connection(&self) -> impl Coroutine<Yield = (), Return = ()> + '_ {
-        #[coroutine] move || {
+        #[coroutine]
+        move || {
             let iter = self.get_connection();
             for i in iter {
                 yield i
@@ -23,5 +24,5 @@ impl Database {
 }
 
 fn main() {
-    Database.check_connection();
+    let _ = Database.check_connection();
 }