1 files changed, 15 insertions, 0 deletions
diff --git a/tests/ui/async-await/async-closures/ambiguous-arg.rs b/tests/ui/async-await/async-closures/ambiguous-arg.rs
new file mode 100644
index 00000000000..d76a1cf953e
--- /dev/null
+++ b/tests/ui/async-await/async-closures/ambiguous-arg.rs
@@ -0,0 +1,15 @@
+//@ edition:2021
+
+// Regression test for #123901. We previously ICE'd as we silently
+// swallowed an in the `ExprUseVisitor`.
+
+#![feature(async_closure)]
+
+pub fn test(test: &u64, temp: &u64) {
+    async |check, a, b| {
+        //~^ ERROR type annotations needed
+        temp.abs_diff(12);
+    };
+}
+
+fn main() {}