1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/iterators/iter-macro-not-async-closure.rs b/tests/ui/iterators/iter-macro-not-async-closure.rs
new file mode 100644
index 00000000000..634391883ea
--- /dev/null
+++ b/tests/ui/iterators/iter-macro-not-async-closure.rs
@@ -0,0 +1,32 @@
+// This test ensures iterators created with the `iter!` macro are not
+// accidentally async closures.
+//
+//@ edition: 2024
+//@ remap-src-base
+
+#![feature(yield_expr, iter_macro)]
+
+use std::task::{Waker, Context};
+use std::iter::iter;
+use std::pin::pin;
+use std::future::Future;
+
+async fn call_async_once(f: impl AsyncFnOnce()) {
+    f().await
+}
+
+fn main() {
+    let f = iter! { move || {
+        for i in 0..10 {
+            yield i;
+        }
+    }};
+
+    let x = pin!(call_async_once(f));
+    //~^ ERROR AsyncFnOnce()` is not satisfied
+    //~^^ ERROR AsyncFnOnce()` is not satisfied
+    //~^^^ ERROR AsyncFnOnce()` is not satisfied
+    //~^^^^ ERROR AsyncFnOnce()` is not satisfied
+    x.poll(&mut Context::from_waker(Waker::noop()));
+    //~^ ERROR AsyncFnOnce()` is not satisfied
+}