1 files changed, 23 insertions, 0 deletions
diff --git a/tests/ui/async-await/issue-71137.rs b/tests/ui/async-await/issue-71137.rs
new file mode 100644
index 00000000000..7695e0325ff
--- /dev/null
+++ b/tests/ui/async-await/issue-71137.rs
@@ -0,0 +1,23 @@
+// edition:2018
+#![feature(must_not_suspend)]
+#![allow(must_not_suspend)]
+
+use std::future::Future;
+use std::sync::Mutex;
+
+fn fake_spawn<F: Future + Send + 'static>(f: F) { }
+
+async fn wrong_mutex() {
+  let m = Mutex::new(1);
+  {
+    let mut guard = m.lock().unwrap();
+    (async { "right"; }).await;
+    *guard += 1;
+  }
+
+  (async { "wrong"; }).await;
+}
+
+fn main() {
+  fake_spawn(wrong_mutex()); //~ Error future cannot be sent between threads safely
+}