1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/lint/must_not_suspend/warn.rs b/src/test/ui/lint/must_not_suspend/warn.rs
new file mode 100644
index 000000000..7fdea66a2
--- /dev/null
+++ b/src/test/ui/lint/must_not_suspend/warn.rs
@@ -0,0 +1,26 @@
+// edition:2018
+// run-pass
+#![feature(must_not_suspend)]
+#![warn(must_not_suspend)]
+
+#[must_not_suspend = "You gotta use Umm's, ya know?"]
+struct Umm {
+    _i: i64
+}
+
+
+fn bar() -> Umm {
+    Umm {
+        _i: 1
+    }
+}
+
+async fn other() {}
+
+pub async fn uhoh() {
+    let _guard = bar(); //~ WARNING `Umm` held across
+    other().await;
+}
+
+fn main() {
+}