1 files changed, 29 insertions, 0 deletions
diff --git a/tests/ui/lint/must_not_suspend/ref.rs b/tests/ui/lint/must_not_suspend/ref.rs
new file mode 100644
index 000000000..f6b23746f
--- /dev/null
+++ b/tests/ui/lint/must_not_suspend/ref.rs
@@ -0,0 +1,29 @@
+// edition:2018
+// revisions: no_drop_tracking drop_tracking
+// [drop_tracking] compile-flags: -Zdrop-tracking=yes
+// [no_drop_tracking] compile-flags: -Zdrop-tracking=no
+#![feature(must_not_suspend)]
+#![deny(must_not_suspend)]
+
+#[must_not_suspend = "You gotta use Umm's, ya know?"]
+struct Umm {
+    i: i64,
+}
+
+struct Bar {
+    u: Umm,
+}
+
+async fn other() {}
+
+impl Bar {
+    async fn uhoh(&mut self) {
+        let guard = &mut self.u; //~ ERROR `Umm` held across
+
+        other().await;
+
+        *guard = Umm { i: 2 }
+    }
+}
+
+fn main() {}