Add regression test for #73137

Co-authored-by: Aaron1011 <[email protected]>

Author: ecstatic-morse

src/test/ui/async-await/issue-73137.rs

@@ -0,0 +1,42 @@
+// Regression test for <https://github.com/rust-lang/rust/issues/73137>
+
+// run-pass
+// edition:2018
+
+#![allow(dead_code)]
+#![feature(wake_trait)]
+use std::future::Future;
+use std::task::{Waker, Wake, Context};
+use std::sync::Arc;
+
+struct DummyWaker;
+impl Wake for DummyWaker {
+    fn wake(self: Arc<Self>) {}
+}
+
+struct Foo {
+    a: usize,
+    b: &'static u32,
+}
+
+#[inline(never)]
+fn nop<T>(_: T) {}
+
+fn main() {
+    let mut fut = Box::pin(async {
+        let action = Foo {
+            b: &42,
+            a: async { 0 }.await,
+        };
+
+        // An error in the generator transform caused `b` to be overwritten with `a` when `b` was
+        // borrowed.
+        nop(&action.b);
+        assert_ne!(0usize, unsafe { std::mem::transmute(action.b) });
+
+        async {}.await;
+    });
+    let waker = Waker::from(Arc::new(DummyWaker));
+    let mut cx = Context::from_waker(&waker);
+    let _ = fut.as_mut().poll(&mut cx);
+}