1 files changed, 25 insertions, 0 deletions
diff --git a/tests/ui/async-await/issue-64130-non-send-future-diags.rs b/tests/ui/async-await/issue-64130-non-send-future-diags.rs
new file mode 100644
index 000000000..b652d2391
--- /dev/null
+++ b/tests/ui/async-await/issue-64130-non-send-future-diags.rs
@@ -0,0 +1,25 @@
+// edition:2018
+#![feature(must_not_suspend)]
+#![allow(must_not_suspend)]
+
+// This tests the basic example case for the async-await-specific error.
+
+use std::sync::Mutex;
+
+fn is_send<T: Send>(t: T) { }
+
+async fn foo() {
+    bar(&Mutex::new(22)).await;
+}
+
+async fn bar(x: &Mutex<u32>) {
+    let g = x.lock().unwrap();
+    baz().await;
+}
+
+async fn baz() { }
+
+fn main() {
+    is_send(foo());
+    //~^ ERROR future cannot be sent between threads safely
+}