1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/hygiene/issue-77523-def-site-async-await.rs b/src/test/ui/hygiene/issue-77523-def-site-async-await.rs
new file mode 100644
index 000000000..2af60ff6f
--- /dev/null
+++ b/src/test/ui/hygiene/issue-77523-def-site-async-await.rs
@@ -0,0 +1,19 @@
+// build-pass
+// aux-build:opaque-hygiene.rs
+// aux-build:def-site-async-await.rs
+
+// Regression test for issue #77523
+// Tests that we don't ICE when an unusual combination
+// of def-site hygiene and cross-crate monomorphization occurs.
+
+extern crate def_site_async_await;
+
+use std::future::Future;
+
+fn mk_ctxt() -> std::task::Context<'static> {
+    panic!()
+}
+
+fn main() {
+    Box::pin(def_site_async_await::serve()).as_mut().poll(&mut mk_ctxt());
+}