1 files changed, 25 insertions, 0 deletions
diff --git a/tests/ui/lint/must_not_suspend/boxed.rs b/tests/ui/lint/must_not_suspend/boxed.rs
new file mode 100644
index 000000000..1f823fc55
--- /dev/null
+++ b/tests/ui/lint/must_not_suspend/boxed.rs
@@ -0,0 +1,25 @@
+// edition:2018
+#![feature(must_not_suspend)]
+#![deny(must_not_suspend)]
+
+#[must_not_suspend = "You gotta use Umm's, ya know?"]
+struct Umm {
+    i: i64
+}
+
+
+fn bar() -> Box<Umm> {
+    Box::new(Umm {
+        i: 1
+    })
+}
+
+async fn other() {}
+
+pub async fn uhoh() {
+    let _guard = bar(); //~ ERROR boxed `Umm` held across
+    other().await;
+}
+
+fn main() {
+}