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diff --git a/tests/ui/async-await/in-trait/async-example-desugared-boxed.rs b/tests/ui/async-await/in-trait/async-example-desugared-boxed.rs
new file mode 100644
index 000000000..1b1b3cffd
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+++ b/tests/ui/async-await/in-trait/async-example-desugared-boxed.rs
@@ -0,0 +1,21 @@
+// edition: 2021
+
+#![feature(async_fn_in_trait)]
+#![feature(return_position_impl_trait_in_trait)]
+#![allow(incomplete_features)]
+
+use std::future::Future;
+use std::pin::Pin;
+
+trait MyTrait {
+    async fn foo(&self) -> i32;
+}
+
+impl MyTrait for i32 {
+    fn foo(&self) -> Pin<Box<dyn Future<Output = i32> + '_>> {
+        //~^ ERROR method `foo` should be async
+        Box::pin(async { *self })
+    }
+}
+
+fn main() {}