1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/async-await/in-trait/warn.rs b/tests/ui/async-await/in-trait/warn.rs
new file mode 100644
index 000000000..71f3822df
--- /dev/null
+++ b/tests/ui/async-await/in-trait/warn.rs
@@ -0,0 +1,22 @@
+// edition: 2021
+
+#![deny(async_fn_in_trait)]
+
+pub trait Foo {
+    async fn not_send();
+    //~^ ERROR  use of `async fn` in public traits is discouraged
+}
+
+mod private {
+    pub trait FooUnreachable {
+        async fn not_send();
+        // No warning
+    }
+}
+
+pub(crate) trait FooCrate {
+    async fn not_send();
+    // No warning
+}
+
+fn main() {}